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
FitPort
*** Featured in Apple's TV ad “Amazing Apps”! ***
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
475 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 included18 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 FitPort: 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 social challenges and community features.
Assumption to check: Limited social features to connect with friends
Validate with people who use this workflow before building.
Hypothesis 2
Implement a simpler onboarding with a guided tour.
Assumption to check: Complex navigation and onboarding process
Validate with people who use this workflow before building.
Hypothesis 3
Improve data syncing reliability.
Assumption to check: Inconsistent syncing with HealthKit/Google Fit
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and save personalized workout templates.
Assumption to check: Lack of customizable workout plans
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
*** Featured in Apple's TV ad “Amazing Apps”! *** Your fitness dashboard for Apple Health app! FitPort reads your health and fitness data from the Health app (HealthKit), and shows them in a beautiful and useful way! -------------------- HEALTH APP INTEGRATION: FitPort shows you the following data from the Health app (HealthKit). You can input your data manually, and the data is stored securely in the Health app. iPhone App: - Steps - Walking + Running Distance - Flights Climbed (Floors) - Cycling Distance - Workouts (Read only) - Exercise Minutes (Read only) - Active Energy - Exercise Minutes (Read only) - Stand Hours (Read only) - Wheelchair Distance - Wheelchair Pushes - Swimming Distance - Swimming Strokes - Resting Calories (BMR) - NikeFuel (Read only) - Dietary Calories - Water - Weight - Body Mass Index (BMI) - Body Fat Percentage - Lean Body Mass (LBM) - Heart Rate (Read only) - Blood Pressure - Sleep Analysis - Mindful Minutes - Waist Circumference - VO2 max - Time in Daylight Apple Watch App: - Activity Rings - Steps - Walking + Running Distance - Flights Climbed (Floors) - Time in Daylight -------------------- FEATURES: iPhone App: - Displays your fitness data from Apple's Health app - Hourly/daily/weekly graph - Shows previous data - Shows your stats - Sets goals and monitor your progress - Change layouts (Auto / Grid / List) - Change units - Shows Steps and Walking + Running Distance automatically (iPhone 5s and above) - Shows Flights Climbed automatically (iPhone 6 and above) Apple Watch App: - Shows Activity Ring, Steps, and Distance - You can see the last 7 days of data in a graph by turning the Digital Crown. - Complications -------------------- NOTE: FitPort does not create any data. It simply reads data from the Health app. -------------------- PRIVACY POLICY SUMMARY: Your data is stored in the Health app (HealthKit), and FitPort will never collect your personal health data. See full privacy policy for more details. --------------------
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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/supabase-js
zustand
react-native-svg
react-native-haptic-feedback
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.
