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 Story
Stop guessing
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
37 ratings · Top 5%
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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
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.
JavaScript is required to complete mailbox verification.
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 Story: 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.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Integrate social challenges and group workouts.
Assumption to check: Limited social features for community engagement
Validate with people who use this workflow before building.
Hypothesis 2
Implement detailed progress charts and analytics.
Assumption to check: Basic progress tracking without advanced analytics
Validate with people who use this workflow before building.
Hypothesis 3
Create clearer subscription tiers and trial options.
Assumption to check: In-app purchase options may be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Add AI-driven personalized workout suggestions.
Assumption to check: Lack of personalized workout recommendations
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
Stop guessing. Start knowing. Fitness Story transforms your Apple Health data into the most powerful, detailed analysis available on iOS. No accounts. No servers. Just your entire fitness journey, visualized. Whether you're tracking sleep stages, analyzing run cadence, or chasing a marathon PR, this is the all-in-one dashboard your hard work deserves. PROFESSIONAL-GRADE ANALYSIS • Trend & Benchmark Charts: Use Box-and-Whisker plots to see median, quartiles, and outliers for every sport type. • Granular Breakdowns: Filter your history by Time of Day, Distance ranges, Duration, Pace buckets, Elevation gain, Cadence, and Stride Length. • Rank Everything: A single tap ranks today's metrics (Distance, Pace, HR, etc.) against your entire history. Know immediately if you hit a "Top 15%" performance. • The Contribution Graph: A GitHub-style heatmap of your entire workout history. Flip it to see detailed daily stats. WORKOUT DETAILS REIMAGINED • Smart Maps: Color-code your outdoor routes by Speed, Elevation, or Heart Rate Zones. (Includes China Map Correction). • Deep Split Analysis: View KM or Mile splits with pace, elevation, HR, and cadence for every single lap. • Heart Rate Zones: Visualize time spent in customized Zones 1–5 based on your age heart resting rate. • Rich Context: Add photos, rich text notes, effort ratings (1–10), and custom tags to every workout. COMPLETE HEALTH COMMAND CENTER • Everything your Apple Watch measures, visualized in one place with daily, weekly, and yearly trends: • Cardio Health: Resting Heart Rate, VO2 Max (age-adjusted), Blood Oxygen, and Respiratory Rate. • Body Composition: Weight, Body Fat %, Lean Body Mass, and BMI with trend indicators. • Activity & Recovery: Steps (with hourly breakdown), Active vs. Basal Calories, and Wrist Temperature deviations. • Advanced Sleep Tracking: Deep, Core, REM, and Awake stages visualized night-by-night. • Correlation Overlays: Overlay multiple health metrics to see how your sleep affects your heart rate or how your weight impacts your VO2 Max. COMPARE & COMPETE • Workout Comparison: Select up to 10 workouts to compare side-by-side. See variance percentages (e.g., "+1.5% Faster") for every metric, by split! • Comparison Export: Want to analyze with different data tools? Export your workout comparison! • Personal Records: Automatic tracking for 1K, 5K, 10K, Half, Marathon, and custom distances. Earn Gold, Silver, and Bronze trophies. • Story Timeline: A chronological feed of every milestone, record, and workout you've ever completed. YOUR DATA, EVERYWHERE • Global Map: See every place you've ever exercised on a clustered, interactive world map. • Powerful Export: Export your entire history (or custom ranges) to CSV or JSON. Includes full split data, body metrics, and metadata. • iCloud Sync: Your favorites, tags, notes, and ratings sync instantly across all your devices. • Privacy First: No hidden servers. Your data lives on your device and in your private iCloud. • Your sweat tells a story. It's time to read it. Download Fitness Story today. Download Fitness Story and unlock the insight! Privacy Policy: https://masawata.net/privacy-policy.html Terms Of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Zustand
react-native-paper
react-navigation
BUILD KIT DIFFICULTY
Advanced
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.
