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.
App Overview
Crazy Times Tables
Crazy Times Tables mixes the fun, games and photo features that kids love, with best practice teaching methods and a personalised boost from technology! Crazy times tables is perfect for children age 5-10 to support t...
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.9
10 ratings · Below Average
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Crazy Times Tables: 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
Introduce more interactive games and rewards to enhance user experience.
Assumption to check: Limited engagement and gamification features
Validate with people who use this workflow before building.
Hypothesis 2
Offer a more flexible pricing model or trial period to attract more users.
Assumption to check: Paywall can deter users
Validate with people who use this workflow before building.
Hypothesis 3
Focus on a modern, colorful design to attract a younger audience.
Assumption to check: User interface is not very appealing
Validate with people who use this workflow before building.
Hypothesis 4
Implement detailed analytics and feedback for users to track their learning effectively.
Assumption to check: Inadequate progress tracking
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
Crazy Times Tables mixes the fun, games and photo features that kids love, with best practice teaching methods and a personalised boost from technology! Crazy times tables is perfect for children age 5-10 to support them to develop fluency in their times tables. Crazy Times Tables: *Is made by experienced teachers who know that kids learn best when having fun! *Takes a personalised learning approach. Each game identifies your child's stage in learning and targets questions which will offer appropriate challenge. *Gives instant feedback, stars indicate progress in that times table. Once the easiest sums are mastered the harder sums are added. *Tricky times tables feature allows children to focus on the sums that they have previously got wrong! *Protects privacy. As educators we are protective of kids privacy, we make child friendly apps! No in-app purchases, no third-party advertising, no social media integration, no collection or sharing of personal information or photos. *Our testers really loved this game!
Written user reviews are not shown here. Check current App Store reviews >
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
Supabase
Zustand
React Navigation
React Native Reanimated
BUILD KIT DIFFICULTY
Intermediate
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.
