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
StretchitAir
StretchitAir is an exercise program for stretching during flights
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
11 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.
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Combine features and design from your favorite apps.
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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 included14 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 StretchitAir: 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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Continue in Rork >
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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
Include more diverse stretching routines and user-generated content.
Assumption to check: Limited workout variety may lead to user boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing and challenges with friends.
Assumption to check: Lack of social features for motivation.
Validate with people who use this workflow before building.
Hypothesis 3
Offer a freemium model with limited free routines.
Assumption to check: Subscription model may deter casual users.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with Apple Health and Google Fit for better user tracking.
Assumption to check: No integration with health tracking apps.
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
StretchitAir is an exercise program for stretching during flights. It’ll help prevent ankle swelling, muscle pain, stiffness, and dehydration – reducing the risks that make flying so hard on your body. Our flight wellness calculator, helpful reminders, and stats will keep you feeling great no matter how long you’re in the air. AIRPLANE STRETCHING ROUTINES - Prevent ankle swelling; alleviate muscle stiffness, pain, and discomfort; boost your blood flow; reduce the risk of developing deep vein thrombosis (or DVT) - Created specifically for stretching in the airplane with you, your neighbors, and lack of space in mind - Easy to use – just start a video and follow along! - All seated sequences can be performed with the seat belt fastened (safety first!) - Each routine is a 6-7 min full body stretch - Bonus! You can use it on a train, in a car, or during long wait times spent sitting at the gate FLIGHT WELLNESS CALCULATOR Calculate the optimal amount of water and must-do stretches based on the length of your flight. REMINDERS Get reminders to stay hydrated and keep moving every hour. FLIGHT WELLNESS STATS Check how well you’re doing on your flight wellness goals. * * * StretchitAir is your healthiest travel companion. We can’t wait to make your flights more enjoyable :)
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
react-native-svg
axios
@react-navigation/native
BUILD KIT DIFFICULTY
Starter
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.
