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
FitTrack: Workout Planner
Elevate Your Training with FitTrack – The Ultimate Privacy-Focused Workout Log.
$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.
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 FitTrack: Workout Planner: 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
Include preset workout templates and custom routines.
Assumption to check: Tracking workouts can be cumbersome without templates.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate a food database with barcode scanning.
Assumption to check: Users struggle with meal logging accuracy.
Validate with people who use this workflow before building.
Hypothesis 3
Provide visual progress charts and summaries for easy understanding.
Assumption to check: Progress tracking can feel overwhelming.
Validate with people who use this workflow before building.
Hypothesis 4
Add social features for challenges and sharing progress.
Assumption to check: Users find it difficult to stay motivated.
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
Elevate Your Training with FitTrack – The Ultimate Privacy-Focused Workout Log. Tired of fitness apps that lock your progress behind a monthly subscription? FitTrack is built for serious lifters who want a clean, powerful, and private way to track their gains without the recurring fees. WHY CHOOSE FITTRACK? ONE-TIME PURCHASE: No subscriptions, no hidden fees, and no "Pro" monthly tiers. Pay once and get lifetime access to all current and future features. PRIVACY FIRST: Your data belongs to you. All workout history is stored locally on your device. No cloud tracking, no data selling. EFFORTLESS LOGGING: Track sets, reps, and weight with a single tap. Stay focused on your lift, not your screen. INTEGRATED TIMERS: Built-in workout and rest timers to keep your intensity high and your recovery precise. DATA THAT MATTERS: Visual summary of your calories burned, duration, and exercise completion after every session. KEY FEATURES: Professional exercise library (Chest Press, Squats, Deadlifts, and more). Dynamic set counter with easy "+" and "-" adjustments. Automatic calorie estimation based on your actual performance. Beautiful, dark-themed UI designed for the gym environment. Streak tracking to keep you motivated every single day. Join the FitTrack community today. One payment. Lifetime gains. No strings attached.
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-native-chart-kit
@supabase/supabase-js
expo-router
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.
