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 365
365 Workouts – your personal coach and motivator.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
167 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.
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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/
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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 365: 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 tracking.
Assumption to check: Limited food database for nutrition tracking
Validate with people who use this workflow before building.
Hypothesis 2
Add social features for users to share progress and challenge friends.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription options and provide clearer prompts for users.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and customize their own workout plans more easily.
Assumption to check: Limited customization for workouts
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
365 Workouts – your personal coach and motivator. Three hundred sixty-five days a year - 365 new workouts! Practice anywhere you want: at home, in the gym, in the office, or outdoor. Just open the app and start working out. Sound and video hints will help you to do it right. With us, you'll be getting one step closer to your goal every day - a beautiful body! Control nutrition, check your steps and water intake, monitor your progress by making measurements, and saving before/after pictures. Get your nutrition recommendations. Add widgets on your home screen to follow your activity throughout the day. This app is 365 opportunities to get better. - Get a new workout every day. - Professional Video Guidance. - Voice coach support. - Synchronization with the Health app. - Workout and nutrition diary. - Pedometer. - Water Reminder. - Measurements Records. - Before/After Pictures. - Choose a coach. - New Widgets. Our app syncs with the Health app to receive and record your activity, nutrition, and personal data. We use iCloud Drive to log in and to sync data. Contact us if you have any questions: [email protected]
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
Redux
Axios
React Navigation
Recharts
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.
