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
FitTally
Your Apple Watch records every workout
$2.99 · In-app purchases
PRICE
$2.99
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 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 FitTally: 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
Implement a more streamlined workout logging process with quick presets.
Assumption to check: Users often find tracking workouts tedious and time-consuming.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate a food database API for easier meal logging.
Assumption to check: Nutrition logging can be cumbersome and lacks a comprehensive food database.
Validate with people who use this workflow before building.
Hypothesis 3
Add social challenges and community features to enhance user engagement.
Assumption to check: Limited social features can make motivation difficult.
Validate with people who use this workflow before building.
Hypothesis 4
Implement AI-driven workout suggestions based on user progress and goals.
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
Your Apple Watch records every workout. FitTally shows you what they all add up to. Apple Fitness is great at showing individual workouts, but it doesn't answer the questions many people really want to know. How far did I swim this year? How many miles have I walked since I bought my Apple Watch? How many bike rides have I completed? What's my all-time distance? FitTally reads your Apple Watch workouts stored in Apple Health and instantly calculates the totals Apple doesn't show. View your progress for: • This Week • This Year • All Time Whether you swim, walk, run, bike, or hike, FitTally transforms years of workout history into beautiful totals, milestones, averages, streaks, and personal achievements that are easy to understand and fun to revisit. Your data never leaves your device. No accounts. No subscriptions. No ads. Because every workout counts—and now you'll finally know what they all add up to.
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
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@react-navigation/native
@react-native-async-storage/async-storage
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.
