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
Stretch Go: Stretching Splits
Unlock your body's full potential with Stretch Go! Feel better, move easier, and reduce stress through our guided stretching programs
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
2,486 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 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.
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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 Stretch Go: Stretching Splits: 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
Introduce a more detailed progress tracking system with visual charts and logs.
Assumption to check: Users find it challenging to track progress over time.
Validate with people who use this workflow before building.
Hypothesis 2
Offer more free routines or trial access to premium content.
Assumption to check: Limited exercise routines available in the free version.
Validate with people who use this workflow before building.
Hypothesis 3
Ensure all animations are optimized and load smoothly.
Assumption to check: Some users report issues with animations not loading correctly.
Validate with people who use this workflow before building.
Hypothesis 4
Implement personalized recommendations based on user progress and preferences.
Assumption to check: Lack of personalization in routines.
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
Unlock your body's full potential with Stretch Go! Feel better, move easier, and reduce stress through our guided stretching programs. Ready to become your most flexible self? Stretch Go makes it simple to improve flexibility and reduce muscle tension from anywhere. Get personalized routines designed for your specific goals, whether it's athletic performance or just relaxing after a long day. Why You'll Love It - Custom Plans: Personalized stretching for your unique needs. - Clear Guidance: Easy-to-follow videos for perfect form. - Progress Tracking: See how far you've come and stay motivated. - Daily Reminders: Never miss a stretch session. - Varied Routines: Find the perfect stretch, any time of day. - Offline Access: Stretch anywhere, no internet required. Transform your body and mind, one stretch at a time. Download Stretch Go now and start feeling amazing! Terms of Service: https://musicworldmedia.com/products/stretchy/tou Privacy Policy: https://musicworldmedia.com/products/stretchy/policies You can reach our support here: [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
react-navigation
axios
react-native-chart-kit
expo-analytics
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.
