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 Stats
Fitness Stats is a delightful app that quickly aggregates your activity and workout data for insights.
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
2,500 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
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 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 Fitness Stats: 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
Integrate a comprehensive food database API for better meal tracking.
Assumption to check: Limited food database for nutrition logging
Validate with people who use this workflow before building.
Hypothesis 2
Add social challenges or group features to enhance user engagement.
Assumption to check: Lack of social features for motivation
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate guided workouts and templates for various fitness levels.
Assumption to check: No guided workouts or templates
Validate with people who use this workflow before building.
Hypothesis 4
Offer competitive pricing or more free features to attract users.
Assumption to check: High subscription cost compared to competitors
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
Fitness Stats is a delightful app that quickly aggregates your activity and workout data for insights. Fitness Stats calculates totals and averages across any date range for the data in the Health app on your iPhone. You can easily compare these stats across two different date ranges as well. Its super simple to quickly answer questions like: • How many steps did I walk during that fun trip to Italy? • Did I burn enough calories during the Holidays? • Am I working out less or more every day this year? Key Features: • Totals & Daily, Weekly, Monthly, and Yearly Averages for every supported data type. • Compare stats across two different date ranges side by side. • Dedicated Today tab to not have to change dates every day. • Tap & expand any stat row to quickly compare stats for the current week, month, and year with the last 7, 30, and 365 days. • Quickly change the dates for the stats from a custom date range to one of the many preset options like Lifetime, Last 7 days, a specific year, or a month. Stats are calculated for the following data categories from the Health app on your iPhone: • Activity: calories, exercise time, steps, flights. • Moving distance: walking, hiking, running, cycling, swimming. • Workouts: running, hiking, cycling, rowing, elliptical, HIIT, pilates, strength training. • Mind & Body Wellness: yoga and meditation. • Sports: tennis, basketball, soccer. • Please reach out if you don't see any data types you want to track. In-App Purchase: Please note that the in-app purchase is only meant for either tipping or for customers who originally downloaded the free version of the app. Privacy Policy: My goal is to make great apps for you, not track you or sell your private, personal information. All Indie apps are built and designed with utmost care to be as private as possible. Fitness Stats performs real-time calculations on data in the Health app on your iPhone. Your data is only used in the app and never shared with other apps, services, or networks.
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
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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.
