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
Beep Test Watch
Challenge yourself with the ultimate fitness test on Apple Watch and iPhone.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
4 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 included16 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 Beep Test Watch: 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
Add workout history, social sharing, and personalized training plans.
Assumption to check: Limited features and functionalities compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement more visual elements and animations.
Assumption to check: User interface could be more engaging
Validate with people who use this workflow before building.
Hypothesis 3
Optimize app performance and resource management.
Assumption to check: Inconsistent performance on older devices
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
Challenge yourself with the ultimate fitness test on Apple Watch and iPhone. A beep test is a 20m shuttle run and is based on the timings first described by Luc Léger. Starting at 8.0 km/h and increases by 0.5 km/h roughly every minute. It is an awesome way of testing your cardio fitness out, and working out what your VO2 max is. When you press start you immediately begin the beep test symbolised by a sound and haptic that plays on your watch. Beep Test Watch was designed with haptics in mind and vibrates differently to indicate a level increase. The app will also track your heart rate and active energy and then create a new workout in Apple Health, so you don't have to start a workout at the same time. The app will also add your VO2 max calculation to Apple Health's cardio fitness. The total time and level will update as you run. A V02 Max calculation will also be shown. Your test history will be saved to your device and iCloud account so you can compare your previous attempts and see your progress overtime. We also show you your average heart for each completed test on Apple Watch. Beep Test Watch now includes support for the following tests: - 15m UK Police Test - UK & Australian Beep tests (as used by the military) - UK Fire Test - Standard Luc Léger test
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
expo-speech
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.
