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
Wrist Coach: Gym Tracker
Wrist Coach: Precision Strength Tracking
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 Wrist Coach: Gym Tracker: 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
Enhance logging with templates and detailed exercise descriptions.
Assumption to check: Apps often lack comprehensive workout logging features
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate social challenges and community features.
Assumption to check: Limited social features for motivation
Validate with people who use this workflow before building.
Hypothesis 3
Add better graphical representations of progress over time.
Assumption to check: Difficulty in tracking progress visually
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create custom workout routines and templates.
Assumption to check: Not enough customization options for workouts
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
Wrist Coach: Precision Strength Tracking Train with Focus. Track with Data. Stop wrestling with your watch in the middle of a heavy set. Wrist Coach is a high-performance workout logger for the Apple Watch, built for athletes who demand clarity, precision, and efficiency. Featuring a specialized "HUD" (Heads-Up Display) interface, Wrist Coach eliminates clutter so you can monitor your session with a single glance. No bloat, no distractions—just the data you need to crush your next set. KEY FEATURES: HIGH-VISIBILITY HUD: A unique, data-first interface designed for high-intensity environments. See your set progress and timers clearly, even in motion. PRECISION SET TIMING: Monitor your ELP (Elapsed) and REM (Remaining) time in real-time. Stay on schedule and maintain the perfect pace for your workout. SEAMLESS SET LOGGING: Rapidly adjust weight and reps with a specialized stepper system that stays out of your way until you need it. SMART PHASE TRANSITIONS: Move from "Set-In-Progress" to "Rest" with one tap. The app manages your timers automatically so you can focus on recovery. POST-WORKOUT SUMMARIES: Review every set, rep, and weight lifted in a clean, scrollable summary immediately after you finish your session. PRIVACY & INTEGRATION: Wrist Coach integrates with Apple HealthKit to read your heart rate data during active workouts. Your health data stays on your device and is never shared with third parties. Requires Apple Watch.
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
Axios
React Navigation
Supabase
Zustand
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.
