App Overview

Braincup icon

Braincup

Simon Schubert · Education

Sharpen your math skills, boost your memory, and enhance your focus with Braincup – the open-source brain training app that's as fun as it is effective! Dive into a collection of challenging yet simple puzzles designe...

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.0
1 ratings · Top 30%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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What's included16 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Free quick prompt For a smaller starting point

Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Braincup: map the core Education workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Add more diverse and frequently updated quiz content.

Assumption to check: Limited quiz categories and topics

Validate with people who use this workflow before building.

Hypothesis 2

Implement spaced repetition to help users retain information.

Assumption to check: No spaced repetition feature for learning retention

Validate with people who use this workflow before building.

Hypothesis 3

Allow users to download quizzes for offline use.

Assumption to check: Lack of offline capabilities

Validate with people who use this workflow before building.

Hypothesis 4

Provide detailed explanations and feedback for each question after quizzes.

Assumption to check: Limited feedback on quiz performance

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Sharpen your math skills, boost your memory, and enhance your focus with Braincup – the open-source brain training app that's as fun as it is effective! Dive into a collection of challenging yet simple puzzles designed to keep your mind agile and motivated. Whether you're warming up for the day or pushing your cognitive limits, Braincup offers quick, engaging sessions that fit into any schedule. No ads, no tracking – just pure brain-boosting fun! Explore the Puzzles: - Anomaly Puzzle: Spot the odd one out by analyzing colors and shapes – perfect for honing observation skills! - Path Finder: Navigate from a starting point by following arrow directions to reach the goal – test your spatial reasoning! - Mental Calculation: Quick math warm-ups to build speed and accuracy in basic arithmetic. - Sherlock Calculation: Craft a formula to hit a specific target – unleash your inner detective with clever number puzzles! - Chain Calculation: Solve intricate multi-step equations – ideal for advanced mental math enthusiasts. - Color Confusion: Stay sharp amid distracting visuals – a fun way to improve focus and quick decision-making. - Fraction Calculation: Master fractions through hands-on solving – great for building mathematical confidence. - Height Comparison: Compare and calculate the tallest outcomes from formulas – a unique twist on logical thinking! - Visual Memory: Memorize and recall the exact order of a series of objects shown briefly – excellent for sharpening short-term memory and attention to detail! - Mini Sudoku - Mini Chess Join thousands of users who are leveling up their brains with Braincup. Start your mental workout – your sharper mind awaits!

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Zustand
Supabase
react-navigation
react-native-reanimated
BUILD KIT DIFFICULTY
Starter

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.