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
Streaks Workout
The personal trainer that you actually want to use.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
7,000 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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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Streaks 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
Include more diverse workouts and exercise categories.
Assumption to check: Limited exercise variety compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing and challenge features.
Assumption to check: No social features for motivation
Validate with people who use this workflow before building.
Hypothesis 3
Implement AI-driven workout suggestions based on user data.
Assumption to check: Lack of personalized workout plans
Validate with people who use this workflow before building.
Hypothesis 4
Offer more free features to engage users initially.
Assumption to check: Premium features might be seen as too limiting
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
The personal trainer that you actually want to use. Exercise at home, in the park, at the gym, anywhere! You don't need any equipment - you just need a few minutes and a floor. You can customize which exercises you want to do, making it great for all ages and abilities. Features: * 30 equipment-free exercises to choose from * Create custom exercises and custom workouts * Workout Packs: curated, ready-made workouts you can unlock once and use on all your devices * 4 different workout lengths (approx. 6, 12, 18 or 30 minutes), or set your own * Voice coaching to guide you through your workout * Plays workout music (requires Apple Music subscription) * Saves workouts to the Health app * View your workout history * Shortcuts support * Widgets for your Home Screen * Syncs your data across iPhone, iPad, Apple Watch and Apple TV One-time purchase. No subscription required. No more excuses: this is the workout you won't dread. If you have any questions or comments, please contact [email protected] ABOUT HEALTH DATA: On supported devices, Streaks Workout accesses the Health app to read and write workout data with your permission. All data is accessed in full accordance with the iOS app review rules set by Apple. Please read our privacy policy at https://streaksworkout.app/privacy for more information on our use of data.
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
axios
victory-native
@react-navigation/native
@react-native-community/async-storage
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.
