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
The Developer
In the near future a programmer by the name The Developer develops an application called "Trillion Dollar App" that sends the world into chaos
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
5 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.
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 The Developer: map the core Developer Tools 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
Integrate more comprehensive project management tools.
Assumption to check: Limited project management features compared to desktop tools.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize data handling and loading times.
Assumption to check: Performance issues with larger projects.
Validate with people who use this workflow before building.
Hypothesis 3
Implement in-app support and tutorials.
Assumption to check: Inadequate user support options.
Validate with people who use this workflow before building.
Hypothesis 4
Add a search and filter functionality for tools.
Assumption to check: Difficulty in finding specific tools.
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
In the near future a programmer by the name The Developer develops an application called "Trillion Dollar App" that sends the world into chaos. He is forced to travel back in time to correct his ways so that his past self can develop a better application for the world. Welcome to the world of The Developer. A fun interactive tutorial with a very twisted story. Aside from a crazy far fetched story the app teach an important lesson - How to code and release you very own app to the App Store in less than one hour from A to Z. This is is intended for beginners wishing to learn Xcode/Swift programming. The app includes the following lessons: iOS Version: Chapter 1 - Items required to get started Chapter 2 - How to register and become a developer Chapter 3 - Creating your first Xcode Template Chapter 4 - Swift Basics Chapter 5 - Build and Test your app Chapter 6 - Dressing your app Chapter 7 - Uploading your project to the App Store Chapter 8 - Application guidelines Chapter 9 - Updating your app watchOS Version: Chapter 1 - Items required to get started Chapter 2 - How to register and become a developer Chapter 3 - Creating your first Xcode Template - New Chapter 4 - Swift Basics - New Chapter 5 - Build and Test your app - New Chapter 6 - Dressing your app - New Chapter 7 - Uploading your project to the App Store - New Chapter 8 - Application guidelines - New Chapter 9 - Updating your app - New Happy Coding!
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 Navigation
Supabase
Expo
React Query
Zustand
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.
