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
FITNESS SF
Your Fitness Journey, Reimagined.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 1.3
41 ratings · Below Average
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 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 FITNESS SF: 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
Focus on stability and thorough testing before launch.
Assumption to check: App has poor user ratings due to bugs and crashes.
Validate with people who use this workflow before building.
Hypothesis 2
Add unique features like social challenges and personalized workout plans.
Assumption to check: Limited features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a user-friendly design with clear navigation paths.
Assumption to check: Difficult navigation and user interface.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing and challenges to enhance user engagement.
Assumption to check: Lack of community and social features.
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 Fitness Journey, Reimagined. The all-new FITNESS SF app is here to streamline your gym experience and keep you motivated. Whether you’re training on the floor at one of our premier Bay Area locations or working out from home, everything you need to succeed is now in one place. Fast & Intuitive Experience ● Easy QR Check-In: No more cards or tags. Simply open the app, scan your unique QR code at the front desk, and start your workout instantly. ● Check-In Streaks: Consistency is the key to results. Track your progress and keep your streak alive every time you visit the club. ● Modern UI: Enjoy a clean, easy-to-use interface that gets you the information you need with fewer taps. World-Class Workouts & Coaching ● View Group Fitness Classes: Check real-time schedules for HIIT, Yoga, Strength Training, and ZUMBA at any of our locations. ● Nutrition Coaching: Achieve a total-body transformation with integrated nutrition guidance and expert coaching to fuel your performance, provided by EatLove. Membership at Your Fingertips ● Total Management: Update your billing, view your visit history, and manage your account details with ease. FITNESS SF is more than a gym; it’s a community dedicated to your success. Download the new app today and take your routine to the next level
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
Firebase
Redux
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.
