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
HARNA: Workout & Fitness
Experience the power of HARNA, an app designed to help you reach your most ambitious fitness goals
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
18,992 ratings · Top 15%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 HARNA: Workout & Fitness: 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
Implement better visualization options for long-term tracking.
Assumption to check: Users often find it hard to track their progress over time.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and enhance the tab structure.
Assumption to check: Navigating between screens can feel cluttered.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create and save custom workout routines.
Assumption to check: Limited workout customization options.
Validate with people who use this workflow before building.
Hypothesis 4
Clarify subscription details and provide clear benefits upfront.
Assumption to check: In-app purchases can be confusing.
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
Experience the power of HARNA, an app designed to help you reach your most ambitious fitness goals. HARNA creates a personalized workout plan tailored to your needs and preferences. Our main premium subscription gives you access to: - A personalized workout plan tailored to your daily activity level, preferred workout days, and favorite types of main and restorative exercises. - A wide variety of workouts, including Chair Yoga, Wall Pilates, Pilates, Yoga, and Indoor Walking and more. - Easy-to-use catalogue featuring hundreds of workout collections. From weight loss routines and microworkouts to strength workouts, there’s something for everyone. - Flexible workout settings — swap, remove, or add exercises anytime to match your goal or mood. We also offer an optional subscription with personalized meal plans to help you achieve your goals even faster. Our mission is to help you make fitness your daily habit. Our dream is to see you strong, motivated and confident. Start achieving your fitness goals today with the HARNA app. Harna is integrated with the Apple Health app (HealthKit), so that you can track your steps inside our application. ⏤ Privacy Policy: https://harnafit.com/privacy-policy Terms of use: https://harnafit.com/terms-of-service
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
react-navigation
axios
react-native-chart-kit
expo-av
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.
