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
Daily Ab Workout
Your own personal trainer wherever you are!
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
1,256 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
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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 included16 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 Daily Ab 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
Allow users to create custom workouts.
Assumption to check: Limited workout customization options
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing and workout challenges.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Integrate with Apple Watch for tracking.
Assumption to check: No integration with wearables
Validate with people who use this workflow before building.
Hypothesis 4
Offer a one-time purchase option alongside subscriptions.
Assumption to check: Subscription fatigue
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
Your own personal trainer wherever you are! FEATURES: • Three different 5 to 10 minute ab-sculpting workouts • Great for both men and women • Video showing how to do each exercise • 30 exercises • Multiple custom routines • Random routines • Ad-free • No internet required to do the workouts • Integrates with Health app (workout and calories burned data will push to Health app) Daily Ab Workout contains three 5 to 10 minute daily ab routines for men and women that step you through thirty of the best ab-sculpting exercises you can do in the comfort of your own home. These proven exercises, demonstrated by a certified personal trainer, target all major abdominal muscles. Spending just minutes a day can strengthen your core and tone your abs. The routine's simple interface, complete with video and timer, allows you to easily follow along and understand each exercise. >>> Want more workouts? Check out the "DAILY WORKOUTS" full version app for multiple workouts including ab, arm, butt, cardio, leg and full-body routines. Daily Workouts now also has Pilates, stretch, kettlebell and ball workouts and more!
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
Supabase
react-navigation
@supabase/supabase-js
react-native-reanimated
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.
