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
Tree RX: Stage Reaction Times
The perfect App for practicing your drag racing reaction times for either Pro or the Sportsman series.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 ratings · Top 5%
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 included15 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.
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 Tree RX: Stage Reaction Times: map the core Sports 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
Include more diverse exercises with varying difficulty levels.
Assumption to check: Limited variety of exercises to improve reaction times.
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing options and leaderboards.
Assumption to check: Lack of social features to compare scores with friends.
Validate with people who use this workflow before building.
Hypothesis 3
Implement graphs/charts to display user progress.
Assumption to check: No progress tracking over time.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance visibility of premium features and benefits.
Assumption to check: In-app purchase for premium features is not clearly communicated.
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
The perfect App for practicing your drag racing reaction times for either Pro or the Sportsman series. You did it again. You spent all those hours in your shop, convinced your buddies to help you "make it scream"...and it seems like you've spent hours listening to advice from others, yet today you red lighted. You've tried it all, from deep staging to stage peeking. You're itching for a hole shot. When you practice something long enough, you become so proficient that it seems almost instinctual, almost like something that you would do naturally. Your brain recognizes the situation and it's familiarity and your brain neurons react and fire quicker. Pony Up will help you get there. The first thing that we recommend when opening the app is setting your Gas Pedal Delay within Settings. This is the delay for how long it takes for your car to start moving after gunning the gas. This of course could be different if your stage peeking. Features: - Custom Engine Haptic Feedback (HIGH, MEDIUM, LOW, OFF) - Pro Tree Reaction Practice - Sportsman Tree Reaction Practice - Complete control over light delays to match your local track. - Saves your times and keeps track of your Top 5 fastest R/T's. See ya at the digs!
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
React Navigation
Firebase
Axios
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.
