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
Great Legs: Leg Workouts
Want toned legs? This app will take you there.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
519 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 Great Legs: Leg Workouts: 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
Offer regular updates and more diverse workouts through subscriptions.
Assumption to check: Limited workout variety after initial purchase.
Validate with people who use this workflow before building.
Hypothesis 2
Implement social features like challenges and sharing progress.
Assumption to check: Lack of community features for user engagement.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance progress tracking with more detailed analytics and visual representations.
Assumption to check: Not enough tracking for user progress over time.
Validate with people who use this workflow before building.
Hypothesis 4
Add support for tracking workouts via Apple Watch or Fitbit.
Assumption to check: Limited integration with wearables.
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
Want toned legs? This app will take you there. It will train you from beginner to great legs in 8 Weeks! Get ready to live your dream ! Great Legs is made by experts, the same people that built the awesome 5K Runner and 10K Runner apps. ----- ABOUT THE APP ----- This app will get you in shape by gradually training you zero exercising to toned legs 8 weeks. You only need this app to guide & motivate you and 10 minutes, 3 times a week, for 8 weeks. When you are done, you will be much stronger and have much better looking legs. When you start a workout, you turn on your favorite music, and then the app's audio coach tells you exactly what exercise to do, when to rest, and when to resume. The app also keeps you motivated, which is the key to success and the true magic of the app. The plan is achievable and enjoyable even by people that never liked to exercise, and you will earn wins and badges as you go along. With this app, you will have better legs. COACHING ● from zero to toned legs in 8 weeks ● guided by your personal audio coach ● starts easy and slowly increases the situps ● straight & simple MUSIC ● listen to your music while exercising ● audio coach gently blends in when needed ● compatible with ALL music apps MOTIVATION ● earn wins and badges ● share your wins on Facebook, Twitter, mail ● meet other trainees on our Facebook community ● motivational quotes for your mind & body SUCCESS ● only 10 mins a day, 3 days a week, 8 weeks ● designed to make any beginner succeed ● extensive guidance for beginners ● answers to common questions AND THERE'S MORE ● stretching & warmup videos ● detailed information & guidance ● and there is more... ● Privacy Policy & Terms Of Use: https://www.fitness22.com/privacy-policy https://s3.amazonaws.com/fitness22content.com/Components/WebPages/TermsOfUse/TermsOfUse.html ----- CONTACT US ----- Dear customers, we are here for you! [email protected]
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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.
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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.
