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 Butt Workout
Want a great butt? 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
496 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 included17 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 Butt Workout: 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
Incorporate more diverse workouts and user-generated content.
Assumption to check: Limited workout variety can lead to user boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing and challenges to engage users.
Assumption to check: No social features for accountability or challenges.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the nutrition logging process with a database of common foods.
Assumption to check: Tracking nutrition is cumbersome.
Validate with people who use this workflow before building.
Hypothesis 4
Implement AI-driven personalized workout plans based on user progress.
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
Want a great butt? This app will take you there. It will train you from beginner to a toned butt in 8 Weeks! Get ready to live your dream ! Great Butt 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 a toned butt 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 a much better looking butt. 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 a better butt. COACHING ● from zero to a toned butt 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 ● integrated with Apple Health ● 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.
SUGGESTED BUILD STACK
React Native
Expo
Firebase
Chart.js
React Navigation
Axios
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.
