Rank Cherry
Stock CherryAnswers must match the syllabus
A general-purpose AI drifts from what students are actually taught. Answers had to come from course material.
All case studies
Case study · In-house product
Rank Cherry: an AI doubt solver and exam-prep platform
A white-label platform for coaching institutes and their students, built and run in-house since July 2025.
- Product
- Rank Cherry
- Domain
- Education: JEE and NEET
- Started
- July 2025
- Status
- On Google Play
- Surfaces
- Android app, web admin portal
Overview
A student app and an admin portal
Students ask doubts and take tests in the Android app. Institutes manage branding, students and mock tests in a web portal.
- AI doubt solving
24/7 - subjects: Physics, Chemistry, Maths, Biology
4 - past NEET questions in the library
3,800+
Figures as of July 2026.
In the app
Answers from the live app
Screenshots from the app's Google Play listing.
The problem
What the platform had to get right
Maths and diagrams
Science answers need correct formulas and diagrams as well as text.
Many institutes, one app
Each coaching institute wants its own brand, students and content without a separate build.
Fair, repeatable tests
Mock papers must be reproducible and scored correctly, including negative marking and partial credit.
Always available
Students ask questions at any hour, so the app has to stay up and answer quickly.
What we built
How each problem was solved
Answers from course material
Each question is matched against course material before the answer is written, so explanations stay on the syllabus. Answer settings can be tuned for each subject.
Diagrams and maths that display properly
When an answer needs a circuit, a cell or a molecule, the app shows a diagram, and equations appear as formatted maths.
Photo questions and read-aloud
Students can photograph a printed question instead of typing it, and have any answer read aloud. The photo is read on the phone and isn't uploaded.
White-label for institutes
Each institute gets its own logo, colours, students and content from the same app, plus bulk student logins.
Fair mock tests
Papers are put together the same way every time, weighted towards a batch's weak topics, and scored with negative marking and partial credit. Ranks and percentiles are fixed when the test closes.
Built to stay up
Along the way we handled AI-provider usage limits, memory limits on small servers and a Google Play platform requirement, and tightened sign-in and access control.
Built with Flutter (Android app), React (admin portal) and Python (backend), hosted on Azure.
Build something similar with us
The team that built Rank Cherry can build for you. The first 30-minute call is free.