BrightMinds: a paid exam-prep app with a study tutor that costs under $1 per student
We built BrightMinds a subscription learning platform for Classes 7–10 and NDA aspirants, with an AI tutor inside every lesson and hard spending limits that keep AI costs predictable.
- Market
- India: school students and NDA exam aspirants
- Platforms
- iOS, Android, admin console
- Timeline
- About 3 months to production-ready
- Model
- Paid subscriptions per class, free tier to try
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The challenge
BrightMinds wanted to turn its study material into a product students would pay for. That meant three things.
A paid app that just works. Students subscribe to their class through the App Store or Google Play and get instant access, with no manual unlocking by staff.
Help when students get stuck. Studying from a PDF alone is lonely. Students need someone to explain a page, highlight what matters for the exam, and test them.
AI without a runaway bill. An AI tutor only works for a small education business if its cost is known in advance and can't spike.
What we built
The student app
- 414 topics across Classes 7, 8, 9, 10 and NDA, with 41 free topics to try before subscribing
- Subscriptions per class. A student can hold more than one, for example Class 10 and NDA.
- A built-in PDF reader for the study material
- Notifications for new content and upcoming renewals, sent only for the classes each student has paid for
- Daily current affairs for NDA general-knowledge preparation, curated with AI twice a day from national news
AI Help: a study tutor on every page
Students tap AI Help while reading any page and choose a mode:
- Explain this page
- The lesson in simple language, at their class level
- Exam focus
- What to remember for their exam
- Quiz me
- Questions to test themselves on that page
- Ask AI
- Any question about the page
Answers are based on the page the student is reading, so they stay on the syllabus. Non-subscribers get one free AI answer: a taste of the paid product at the moment they need help.
The admin console
- Upload PDFs and publish new topics
- Manage free and paid content per class
- See users, active subscriptions by class, and system health
- Send notifications to students
The engineering that protects the business
AI costs have a hard limit
A shared answer cache, a daily limit per student, and a platform-wide daily cap that alerts a human. Worst case is about $0.003 per answer.
Paid access is enforced on the server
Nobody can bypass the paywall by tampering with the app, and no AI keys are stored inside it.
Answers never go stale
When the team replaces a PDF, the AI explanations for that page regenerate automatically.
Paying students never get locked out
Late or out-of-order App Store and Google Play events can never shorten a student's access.
Every AI request is logged
Usage and cost are recorded per request and match the cloud bill, so the client always knows what AI costs.
Topics live, 41 of them free
Class tracks: Classes 7–10 and NDA
Worst-case AI cost per student
AI Help modes on every page
AI Help launched in September 2026. We're measuring its effect on free-to-paid conversion and renewals and will add the before-and-after numbers here.
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Tell us what you're building. We'll tell you what it takes.
A 20-minute call with Ritesh, the founder. No sales team, no obligation.
Not ready to talk? Send a short message · ritesh@keelwork.studio