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
Tower Math®
- Editor's Choice Award! - Children's Technology Review
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
44 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 included18 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 Tower Math®: 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 dynamic challenge generation based on user skill level.
Assumption to check: Limited variety in challenges can lead to boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Add leaderboards or challenge friends functionality.
Assumption to check: No social features for competition or collaboration.
Validate with people who use this workflow before building.
Hypothesis 3
Implement adaptive learning based on user performance.
Assumption to check: Lack of personalized learning paths.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance progress tracking with more detailed analytics.
Assumption to check: Difficulties in tracking long-term progress effectively.
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
- Editor's Choice Award! - Children's Technology Review Tower Math® makes practicing arithmetic fun! Free the numbers with your magic towers in this action packed, 3D game! The numbers have been turned into monsters by an evil wizard! As you add, subtract, multiply and divide, you build towers with magic powers that can free the numbers. You can also use your math skills to earn special powers like the Freeze Ray and Magic Rain. You earn a bronze, silver or gold medal for every successfully completed level. Your game progress and medals are all saved under your player profile. Up to 5 player profiles can be created. HAVE FUN WHILE PRACTICING MATH: ▸ Addition ▸ Subtraction ▸ Multiplication ▸ Division FEATURES: ▸ A full-featured tower defense game ▸ Beautiful 3D graphics ▸ 20 unique scenes ▸ Create up to five player profiles ▸ Earn medals for each level ▸ Fun sound effects and music ▸ iPhone 5 and iPad Retina Display support ▸ Works on both iPhone and iPad - a universal app Tower Math® is an educational app for all ages that's actually FUN to play. Try it now! PRIVACY DISCLOSURE Tower Math®: - Does not contain 3rd party ads. - Does not contain in-app purchases. - Does not contain integration with social networks. - Does not use 3rd party analytics / data collection tools. - Does include links to apps by Dan Russell-Pinson in the iTunes App Store (via Performance Horizon). For more information on our privacy policy please visit: http://dan-russell-pinson.com/privacy/
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
Zustand
Supabase
React Navigation
react-native-svg
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.
