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
Fast Hands Trainer
Boost Your Reflexes and Hand Speed with Fast Hands Trainer!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
16 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.
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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Combine features and design from your favorite apps.
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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 included14 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 Fast Hands Trainer: map the core Health & Fitness 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
Offer a wider range of workouts and customizable routines.
Assumption to check: Limited workout variety and lack of customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Implement more robust tracking features with analytics.
Assumption to check: Inconsistent tracking of progress.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the navigation and enhance user onboarding.
Assumption to check: Users report difficulty in navigation.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a one-time purchase option for premium features.
Assumption to check: High churn rate due to subscription fatigue.
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
Boost Your Reflexes and Hand Speed with Fast Hands Trainer! Ready to enhance your reaction time and hand speed? Whether you're an athlete looking to gain a competitive edge or simply want to sharpen your reflexes, Fast Hands Trainer offers a fun and interactive way to improve. Key Features: Interactive Exercise: Engage in a dynamic activity designed to challenge and improve your reflexes and hand speed. Customizable Difficulty: Adjust the difficulty levels to match your skill level and continuously push your limits. User-friendly Interface: Enjoy a sleek and intuitive design that makes training enjoyable and straightforward. Why Choose Fast Hands Trainer? Scientific Approach: Our exercise is based on a proven technique to enhance reflexes and hand speed. Versatile Use: Perfect for athletes, gamers, or anyone looking to improve their reaction times. Fun and Engaging: Stay motivated with a simple interactive and enjoyable exercise. Don't let slow reflexes hold you back. Download Fast Hands Trainer today and start your journey towards faster, sharper reactions!
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
React Navigation
Victory Native
Async Storage
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.
