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Purchase terms, how we handle your data, refund details and ways to get help.

Software licenses and source-code information are on our Open-Source & Licenses page.

Terms of Service

Last updated: 2 October 2026

1. Who we are

ECE Lab ("we", "us", "the site") is a personal-brand educational website operated by Vamshi Bellam, an individual based in Hyderabad, India. The site is reachable at ecelab.me.

2. Acceptance

By using the site, creating an account, or making a payment, you agree to these Terms of Service. If you do not agree, please stop using the site.

3. What you're actually purchasing

ECE Lab sells one-time, non-subscription digital unlocks. There is no recurring billing. As of this writing, the products are:

A guided-lesson unlock for VLSI or Embedded Systems (₹299 per domain), or the ROS 2 course (₹99), granting lifetime access to all lessons in the purchased domain. The first lesson in each topic remains a free preview. Each domain is purchased separately. This purchase does not include hands-on practice, projects or Interview Prep.
Interview Prep (₹199 per domain), granting lifetime access to the full question bank and AI answer feedback. AI features are subject to service availability and rate limits.
A practice and Interview Prep bundle for VLSI or Embedded Systems (₹548 per domain), granting 12 months of hands-on practice and lifetime Interview Prep access. Lessons and projects are separate purchases.
A personalized project match, generated from your Domain Finder quiz answers, including its full resources (GitHub repo, schematic, bill of materials) — free, no purchase required.
A domain practice unlock (currently ₹399), which grants access to the graded practice exercises in that domain — including, for VLSI, the combined Circuit & Chip Design ladder's problems beyond its free set, and for Embedded, the Embedded C, RTOS and Linux Command-Line practice problems beyond their own free sets. This unlock grants access for 12 months from the date of purchase, not permanently — see Section 6 below. It does not include guided lessons, Interview Prep or project resources.
A domain project-library unlock (currently ₹99), which grants access to the project resources available in that domain's library — a separate purchase from the domain practice unlock above. This unlock grants access permanently.
A single-project unlock (currently ₹11), which grants lifetime access to the resources available for one specific project. Check its listing for the included files and guides.
An additional personalized project match beyond your first 3 free ones (currently ₹11 each).

Prices above are the standard, normal price for each product. We may run promotional discounts or coupons from time to time — any active promotion is shown to you at checkout, and does not change what the product normally costs.

Every unlock is a personal, non-transferable license to view and use that specific content — see Section 6 ("License to use content") below for how long each type of unlock lasts (a domain practice unlock is time-limited; lesson, Interview Prep, project-match, single-project, and domain project-library unlocks are not).

4. Eligibility

You must be at least 18 years old to make a payment yourself — this is a standard rule that applies to entering into a paid contract in India, and is separate from whether you are old enough to use the free parts of the site. If you are between 13 and 18, you are welcome to use the available free features (roadmaps, lesson previews and free practice exercises) on your own, but if you want to buy a paid unlock, a parent or legal guardian needs to be the one who actually makes the payment on your behalf, using their own payment method and agreeing to these Terms for that purchase.

5. Account

You are responsible for keeping your login credentials secure and for any activity under your account. Do not share your account. Notify us immediately at labsofece@gmail.com if you suspect unauthorized access.

6. License to use content

A "license" here just means permission to use something we still own — using a free project match or buying a domain unlock does not transfer ownership of that content to you, it gives you permission to view and use it. Specifically: whether you're using your free personalized project match or you've purchased a project pack or domain unlock, we grant you a license that is personal (only you may use it, not shared with friends or classmates), non-transferable (you cannot sell or give your access to someone else), and non-exclusive (we can also license the same content to other students — you are not getting the only copy). How long the license lasts depends on what it is: your personalized roadmap, any single-project unlock, and any domain project-library unlock, guided-lesson unlock, and Interview Prep unlock are lifetime (they do not expire or need renewal); a domain practice unlock grants access for 12 months from the date of purchase(including one claimed for free under a promotional coupon — see Section 3), after which you'll need to renew it to keep using that domain's paid practice content. In short: you may not resell, republish, redistribute, or share your account access with others.

7. Third-party links

Our roadmaps link to external resources (YouTube videos, GitHub repos, datasheets, vendor product pages). We do not control these sites and are not responsible for their content, availability, or pricing changes.

8. Third-party and open-source software

ECE Lab is built using a substantial amount of third-party and open-source software, including a real Linux operating system (kernel, BusyBox, bash, and related tools) that runs inside your browser as part of the "Linux Command-Line" practice track. Some of this software is licensed under the GNU General Public License (GPL), which requires us to make its corresponding source code available to you. See our Open-Source & Licenses page for the full list of components, their licenses, and how to request GPL source code.

Your use of any third-party software embedded in or served by the site (including the Linux CLI terminal, the C-code execution backend, and the Verilog synthesis backend) is additionally subject to that software's own license terms, which take precedence over these Terms where they conflict regarding that specific component.

9. No professional advice

Content on ECE Lab is educational and reflects the author's personal experience building and learning engineering projects. It is not career counselling, legal advice, or a guarantee of employment outcomes. Decisions you make based on the content are your own.

10. Acceptable use

Do not attempt to break the site, scrape paid content, share account access, or use the site to harm other users. We reserve the right to suspend accounts that violate these terms.

11. Acceptable use of the practice/code-execution features

The Linux Command-Line terminal, the Embedded C code runner, and the Verilog/RTL synthesis runner are sandboxed learning environments. When using them, you agree not to:

Attempt to break out of, escape, or gain unauthorized access beyond the sandboxed environment provided (the v86 virtual machine, the Wandbox-backed C compiler service, or the Yosys/DigitalJS synthesis pipeline), including attempting to access our underlying infrastructure, other users' data, or systems outside the intended practice environment.
Use these features to run code for purposes unrelated to the practice exercises provided (e.g. as a free general-purpose compute or compiler service, cryptocurrency mining, or to attack third-party systems).
Submit automated, scripted, or bulk requests to any grading or execution endpoint beyond normal interactive use (our systems apply automated rate limits and may block traffic that appears abusive).
Attempt to extract, reverse-engineer, or bulk-download hidden test cases, hidden Verilog stimulus steps, or other content we have deliberately withheld as part of grading integrity.

We reserve the right to suspend or terminate access for violation of this section, in addition to our general right to suspend accounts under Section 10 above.

12. Payments and refunds

Payments are handled by Razorpay. See our Refund Policy section below for details on when refunds are issued.

13. Limitation of liability

"As-is" means we do not promise the site will be perfect or error-free, and are not responsible for indirect knock-on consequences of something going wrong (for example, we are responsible for fixing a bug that breaks a practice problem, but not for indirect losses that bug might have caused you elsewhere). To the maximum extent permitted by law, we are not liable for any indirect, incidental, or consequential damages arising from your use of the site. If something does go wrong and we are found liable, our total liability for any claim is capped at the amount you actually paid us in the 12 months before the claim — so if you purchased a single ₹11project unlock, that is the practical ceiling on what we could owe you, not an unlimited amount. We are also not liable for any loss, damage, or data resulting from your use of the sandboxed code-execution or Linux terminal features, including any loss of in-progress work in those environments. Signed-in users' C and Verilog editor code can be saved to their account, alongside completion records. Terminal state and some other work remain in the browser. Guest editor work is not saved to an account. Saving can fail or be interrupted, so keep your own copy of work you want to retain.

14. Changes

We may update these terms from time to time. The "Last updated" date above reflects the most recent change. Continued use after changes means you accept the updated terms.

15. Governing law

These terms are governed by the laws of India. Any dispute arising from these terms or your use of the site will be subject to the exclusive jurisdiction of the courts in Hyderabad, Telangana, India.

16. Contact

Questions? Email labsofece@gmail.com, or see the full Contact section below.

Privacy Policy

Last updated: 8 October 2026

This section explains what data we collect, why, and how to remove it, including when you use a feature without an account.

What we collect and why

You can browse public content without an account. When you use the features below, we handle the information needed to provide them. This notice also covers information submitted without signing up.

Account details

Your email, authentication details and any name you provide are used to manage your account, show your profile and send account-related or learning follow-up messages. You can ask us to stop optional follow-up emails.

Quiz answers and results

Domain Finder and project-match answers are used to generate your result. Saved results are linked to your account where applicable. If you request a result by email, we store your email and the associated answers or result and use them to send it to you.

Student profile and public leaderboard

Your student name, college and year of study are required to complete your profile; mobile is optional. Leaderboard participation is automatic. After your first saved lesson or practice completion, your student name, rank, XP and completion count can appear publicly. College, year, mobile, email, saved code and detailed activity history are not shown on the public leaderboard.

Progress and saved code

Completion records help you resume learning and practice. For signed-in users, the C and Verilog editors also save code to your account. Signed-in C and RTOS submissions also retain your code, verdict, test counts and submission time privately, with the 20 most recent submissions per exercise kept for review. Custom-input runs are not stored in submission history. Account deletion removes these submissions. Some preferences, progress and terminal state are stored in your browser instead.

Code and interview answers submitted for feedback

C code and exercise test inputs are sent for compilation when you run a C exercise. Interview answers, the question and reference material are sent for AI feedback when you request grading. Avoid including passwords or other sensitive information in either.

Resume drafts and local LaTeX compilation

Resume files are read on your device. Extracted details, draft edits and job descriptions remain in this browser's storage. If you sign in and choose Save LaTeX to account, we store the source document and its name privately in Supabase, linked to your account, so you can open it on other devices. The source includes any personal details you put in the document. Account drafts have version and update timestamps; local recovery copies are separated by account. You can delete saved resumes from the studio. Form fields, uploaded originals and exported PDFs are not synced. No resume content is sent for AI processing. PDF and Word exports and LaTeX compilation run locally. Choosing Open in Overleaf sends your LaTeX source to Overleaf in a new tab. Download a backup before clearing site data or changing devices, and delete drafts on shared computers. Ordinary site visit analytics still apply.

Purchase records

We store the product, amount, transaction date, payment identifiers and account details needed to confirm payment, grant access, resolve payment issues and maintain accounting records.

Retired practice trial records

Practice trials are no longer offered. For previously started trials, we stored the track, start and expiry times, and usage limits against your account. We also keep a keyed fingerprint of your verified email to prevent repeat claims; the fingerprint does not store the email itself. Trial request limits use keyed IP fingerprints. These records no longer grant practice access.

Call-interest forms and support requests

We use the name, email or contact number, topic and preferred time you submit to respond to your request. Sending an interest form does not confirm a booking or purchase.

Technical logs and usage analytics

Hosting logs and abuse controls process request information, including IP addresses, paths, timestamps and errors. Google Analytics and our own page-view logging help us understand visits, referral sources and device/browser information. Our own page-view records can be linked to your user ID when you are signed in, and can include campaign referral tags. We also measure offer, checkout and payment-flow events using product and outcome information. Our payment-flow analytics helper excludes customer details and payment IDs.

ECE Lab does not store your payment card number, CVV, UPI credentials or net-banking credentials. Payment details are entered with Razorpay. We do not request precise device location or sell your personal data.

Services that process information

Supabase — account authentication and storage of profile details, saved results, progress, code, purchases and form submissions.
Razorpay — payments and refunds; it receives your payment details directly.
Vercel — hosting and technical request logs.
Google Gemini and Groq — quiz interpretation, clarification and result generation using the answers and messages relevant to those features.
OpenRouter and its selected model providers — interview-answer feedback, and fallback processing for quiz AI features. Relevant answers, prompts and reference material are sent to these services. The provider may vary with availability.
Wandbox— compiles and runs submitted C code with the exercise's test inputs.
Resend — delivers requested results and follow-up emails, receiving your email address and the message content.
Google Sheets / Apps Script — when configured, receives copies of call-interest submissions and purchase summaries for administration. These include contact details and, for purchases, the product, amount and date.
Google Analytics — receives visit and usage-event information, including device/browser details and approximate location.
YouTube and Wokwi — embedded videos and simulations connect to these services, which can receive request/device information and information you enter into their embedded tools.

These services process information under their own privacy policies and may operate outside India. Their retention and processing practices differ from ECE Lab's. You can browse lessons without submitting code or requesting AI feedback.

Cookies and browser storage

Supabase authentication cookies keep you signed in and can persist beyond a single browsing session. Our browser authentication client can access these cookies; they are not all HTTP-only. We also use cookies to manage free quiz allowances and browser storage for preferences and some learning/practice state.

Google Analytics uses cookies such as _ga to distinguish visits. Embedded services may use their own cookies. Browser privacy settings or tracking blockers can limit analytics; blocking authentication cookies can prevent sign-in from working. Clearing browser storage can remove work stored only on that device.

Data retention

We keep account data while your account is active. Our purchase-record retention period is 7 years for tax and accounting purposes, subject to applicable record-keeping requirements. This is our retention policy, rather than a claim that every purchase has the same statutory retention period.

Access, correction and deletion requests

A trial email fingerprint stays while the account and trial exist. After deletion, we retain only that fingerprint for 90 more days to prevent immediate repeat claims, then remove it through scheduled cleanup. Trial request-limit records expire within two days and are removed by the same cleanup.

Email labsofece@gmail.com to request a summary of your data, correct it, delete your account or information submitted without an account, withdraw consent, or raise a privacy complaint. Contact us from the relevant email address where possible so we can verify the request. You may also contact us about appointing a nominee to act on your behalf.

You can delete your account from Delete account. Deletion includes your profile, associated saved results, progress, submitted code and account purchase access. It is permanent and does not issue a refund. External payment-provider records may need to be retained for accounting or legal obligations. Withdrawal can affect features that require the data; it does not undo processing already carried out. Tell us if your request also concerns a form submission or administrative copy.

India's Digital Personal Data Protection Act, 2023 is being brought into force in stages under the official commencement notification. Statutory rights, obligations and complaint procedures apply as the relevant provisions take effect. We accept the requests described above in the meantime. If a complaint remains unresolved, you may pursue remedies available under applicable law.

Children's data

The DPDP Act defines a child as a person under 18; its child-data provisions follow the phased commencement described above. Our free content is intended for students aged 13 and above. Purchases by anyone under 18 must be made by a parent or legal guardian under our eligibility terms.

We do not currently have an automated age-verification or parental-consent process for accounts. If you are a parent or guardian and believe your child has submitted personal data, contact labsofece@gmail.com to request removal of the associated account or information.

Changes and privacy contact

We update the date above when this notice changes. For privacy questions or requests, email labsofece@gmail.com.

Refund and Cancellation Policy

Last updated: 2 October 2026

No refunds on digital purchases

ECE Lab sells digital goods (domain unlocks, project guides, curated resource packs — the personalized roadmap itself is free, nothing to refund there). Once a payment is successful, the unlocked content becomes accessible from your account for the purchased access period: lifetime for lessons, Interview Prep and project resources; 12 months for hands-on practice. Because of this instant-delivery nature, we do not offer refunds or cancellations after purchase.

Please review the free preview, the pricing page, and the relevant domain's roadmap before paying. If you are unsure whether a domain or project fits you, email us before paying — we will help you decide.

Exceptions

We will issue a full refund in the following cases:

Duplicate charge. If you were charged more than once for the same product due to a payment-system error.
Payment succeeded but content was not unlocked within 24 hours and we are unable to resolve the issue.
Unauthorized transaction on your card or UPI that you can verify with your bank.

How to request a refund

Email labsofece@gmail.com within 7 days of the transaction with:

The Razorpay payment ID (starts with pay_)
The email you used to sign up
A short description of the issue

Refund timelines

Approved refunds are processed within 5–7 business days through the original payment method. Banks may take an additional 3–5 days to reflect the refund on your statement.

Cancellation

We do not run subscriptions. All purchases are one-time payments, so there is nothing to cancel.

Contact

For account help, payment issues, privacy requests or feedback, email us below.

Email

labsofece@gmail.com

Response time

We aim to reply within 24–48 hours. Payment and account issues are easier to investigate when you include the details below.

Business address

Hyderabad, Telangana, India

Operated by

Vamshi Bellam, Individual / Sole Proprietor.

What to email about

Refund or payment issues — include your account email and Razorpay payment ID
Account help— login problems, didn't get unlock after payment
Data deletion — see the Privacy Policy above
Bug reports — what you tried, what happened, screenshot if possible
Feedback— what's working, what isn't, what you wish existed
Partnerships — if you teach ECE and want to collaborate

See also: Pricing · Open-Source & Licenses

Terms · Privacy · Refunds · Contact

Purchase terms, how we handle your data, refund details and ways to get help.

Software licenses and source-code information are on our Open-Source & Licenses page.

Terms of Service

Last updated: 2 October 2026

1. Who we are

ECE Lab ("we", "us", "the site") is a personal-brand educational website operated by Vamshi Bellam, an individual based in Hyderabad, India. The site is reachable at ecelab.me.

2. Acceptance

By using the site, creating an account, or making a payment, you agree to these Terms of Service. If you do not agree, please stop using the site.

3. What you're actually purchasing

ECE Lab sells one-time, non-subscription digital unlocks. There is no recurring billing. As of this writing, the products are:

A guided-lesson unlock for VLSI or Embedded Systems (₹299 per domain), or the ROS 2 course (₹99), granting lifetime access to all lessons in the purchased domain. The first lesson in each topic remains a free preview. Each domain is purchased separately. This purchase does not include hands-on practice, projects or Interview Prep.
Interview Prep (₹199 per domain), granting lifetime access to the full question bank and AI answer feedback. AI features are subject to service availability and rate limits.
A practice and Interview Prep bundle for VLSI or Embedded Systems (₹548 per domain), granting 12 months of hands-on practice and lifetime Interview Prep access. Lessons and projects are separate purchases.
A personalized project match, generated from your Domain Finder quiz answers, including its full resources (GitHub repo, schematic, bill of materials) — free, no purchase required.
A domain practice unlock (currently ₹399), which grants access to the graded practice exercises in that domain — including, for VLSI, the combined Circuit & Chip Design ladder's problems beyond its free set, and for Embedded, the Embedded C, RTOS and Linux Command-Line practice problems beyond their own free sets. This unlock grants access for 12 months from the date of purchase, not permanently — see Section 6 below. It does not include guided lessons, Interview Prep or project resources.
A domain project-library unlock (currently ₹99), which grants access to the project resources available in that domain's library — a separate purchase from the domain practice unlock above. This unlock grants access permanently.
A single-project unlock (currently ₹11), which grants lifetime access to the resources available for one specific project. Check its listing for the included files and guides.
An additional personalized project match beyond your first 3 free ones (currently ₹11 each).

4. Eligibility

5. Account

6. License to use content

7. Third-party links

8. Third-party and open-source software

9. No professional advice

10. Acceptable use

Do not attempt to break the site, scrape paid content, share account access, or use the site to harm other users. We reserve the right to suspend accounts that violate these terms.

11. Acceptable use of the practice/code-execution features

The Linux Command-Line terminal, the Embedded C code runner, and the Verilog/RTL synthesis runner are sandboxed learning environments. When using them, you agree not to:

Attempt to break out of, escape, or gain unauthorized access beyond the sandboxed environment provided (the v86 virtual machine, the Wandbox-backed C compiler service, or the Yosys/DigitalJS synthesis pipeline), including attempting to access our underlying infrastructure, other users' data, or systems outside the intended practice environment.
Use these features to run code for purposes unrelated to the practice exercises provided (e.g. as a free general-purpose compute or compiler service, cryptocurrency mining, or to attack third-party systems).
Submit automated, scripted, or bulk requests to any grading or execution endpoint beyond normal interactive use (our systems apply automated rate limits and may block traffic that appears abusive).
Attempt to extract, reverse-engineer, or bulk-download hidden test cases, hidden Verilog stimulus steps, or other content we have deliberately withheld as part of grading integrity.

We reserve the right to suspend or terminate access for violation of this section, in addition to our general right to suspend accounts under Section 10 above.

12. Payments and refunds

Payments are handled by Razorpay. See our Refund Policy section below for details on when refunds are issued.

13. Limitation of liability

14. Changes

We may update these terms from time to time. The "Last updated" date above reflects the most recent change. Continued use after changes means you accept the updated terms.

15. Governing law

These terms are governed by the laws of India. Any dispute arising from these terms or your use of the site will be subject to the exclusive jurisdiction of the courts in Hyderabad, Telangana, India.

16. Contact

Questions? Email labsofece@gmail.com, or see the full Contact section below.

Privacy Policy

Last updated: 8 October 2026

This section explains what data we collect, why, and how to remove it, including when you use a feature without an account.

What we collect and why

You can browse public content without an account. When you use the features below, we handle the information needed to provide them. This notice also covers information submitted without signing up.

Account details

Quiz answers and results

Student profile and public leaderboard

Progress and saved code

Code and interview answers submitted for feedback

Resume drafts and local LaTeX compilation

Purchase records

We store the product, amount, transaction date, payment identifiers and account details needed to confirm payment, grant access, resolve payment issues and maintain accounting records.

Retired practice trial records

Call-interest forms and support requests

We use the name, email or contact number, topic and preferred time you submit to respond to your request. Sending an interest form does not confirm a booking or purchase.

Technical logs and usage analytics

Services that process information

Supabase — account authentication and storage of profile details, saved results, progress, code, purchases and form submissions.
Razorpay — payments and refunds; it receives your payment details directly.
Vercel — hosting and technical request logs.
Google Gemini and Groq — quiz interpretation, clarification and result generation using the answers and messages relevant to those features.
OpenRouter and its selected model providers — interview-answer feedback, and fallback processing for quiz AI features. Relevant answers, prompts and reference material are sent to these services. The provider may vary with availability.
Wandbox— compiles and runs submitted C code with the exercise's test inputs.
Resend — delivers requested results and follow-up emails, receiving your email address and the message content.
Google Sheets / Apps Script — when configured, receives copies of call-interest submissions and purchase summaries for administration. These include contact details and, for purchases, the product, amount and date.
Google Analytics — receives visit and usage-event information, including device/browser details and approximate location.
YouTube and Wokwi — embedded videos and simulations connect to these services, which can receive request/device information and information you enter into their embedded tools.

Cookies and browser storage

Data retention

Access, correction and deletion requests

Children's data

Changes and privacy contact

We update the date above when this notice changes. For privacy questions or requests, email labsofece@gmail.com.

Refund and Cancellation Policy

Last updated: 2 October 2026

No refunds on digital purchases

Exceptions

We will issue a full refund in the following cases:

Duplicate charge. If you were charged more than once for the same product due to a payment-system error.
Payment succeeded but content was not unlocked within 24 hours and we are unable to resolve the issue.
Unauthorized transaction on your card or UPI that you can verify with your bank.

How to request a refund

Email labsofece@gmail.com within 7 days of the transaction with:

The Razorpay payment ID (starts with pay_)
The email you used to sign up
A short description of the issue

Refund timelines

Approved refunds are processed within 5–7 business days through the original payment method. Banks may take an additional 3–5 days to reflect the refund on your statement.

Cancellation

We do not run subscriptions. All purchases are one-time payments, so there is nothing to cancel.

Contact

For account help, payment issues, privacy requests or feedback, email us below.

Email

labsofece@gmail.com

Response time

We aim to reply within 24–48 hours. Payment and account issues are easier to investigate when you include the details below.

Business address

Hyderabad, Telangana, India

Operated by

Vamshi Bellam, Individual / Sole Proprietor.

What to email about

Refund or payment issues — include your account email and Razorpay payment ID
Account help— login problems, didn't get unlock after payment
Data deletion — see the Privacy Policy above
Bug reports — what you tried, what happened, screenshot if possible
Feedback— what's working, what isn't, what you wish existed
Partnerships — if you teach ECE and want to collaborate

See also: Pricing · Open-Source & Licenses