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
Fitness Coach FitProSport FULL
Your workout sessions will be fully effective with a professional fitness trainer «FitProSport»!
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
32 ratings · Top 15%
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 included17 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 Fitness Coach FitProSport FULL: 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
Incorporate a wider range of exercises with video demos.
Assumption to check: Limited exercise variety in workout plans
Validate with people who use this workflow before building.
Hypothesis 2
Simplify meal logging with barcode scanning and food database.
Assumption to check: Nutrition tracking is cumbersome
Validate with people who use this workflow before building.
Hypothesis 3
Add social challenges and community features.
Assumption to check: No social features for motivation
Validate with people who use this workflow before building.
Hypothesis 4
Implement a freemium model with more free content.
Assumption to check: Subscription paywall may deter users
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
Your workout sessions will be fully effective with a professional fitness trainer «FitProSport»! Main differences from the free version: - More than 500 simple and effective exercises for men and women - Stretching for men and women - Workout plans for men and women to perform the exercises at home or at a gym - No ads - Graphs by results of workout sessions - Graphs by results of body measurement - Timer with notifications and Stopwatch - Data synchronization from the free version into the full version The fitness tracker for the gym and home the exercises presented: - With your body weight (pull up bars, parallel bars, push ups, with a fitball, burpees, etc.) - With dumbbells, kettle bells and barbells - On the exercise machines - With a fitball and pulley weights - With TRX And all this is at the price of a hamburger! Always with you, «FitProSport» team
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
@react-native-community/hooks
Firebase
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.
