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.
Fitness Buddy: Your Personal Workout Assistant
$0.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Fitness Buddy!: 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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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
Assumption to check: Lack of social features for motivation and engagement
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited nutrition tracking options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No integration with wearables
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Subscription model complexity
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Fitness Buddy: Your Personal Workout Assistant Transform your fitness journey with Fitness Buddy, the intelligent workout companion designed for everyone from beginners to advanced athletes. Our app makes creating effective workouts simple while keeping you motivated with smart features based on exercise science. CUSTOMIZE YOUR PERFECT WORKOUT • Interactive body diagram makes selecting target muscle groups intuitive • Three difficulty levels: Beginner, Intermediate, and Advanced • Extensive exercise library for every major muscle group • Fully customizable workouts - add, remove, or modify exercises • Estimate workout duration before you begin TRAIN SMARTER, NOT HARDER • "Pick for Me" AI feature recommends balanced workouts based on your history • Scientific muscle recovery tracking shows when each muscle group is ready for training • Visual strain indicators help prevent overtraining • Step-by-step workout guidance with sets and reps tracking • Simple checkboxes to mark exercises complete as you progress TRACK YOUR PROGRESS • Calendar view displays your complete workout history • Motivational streak counter to encourage consistency • Visual progress indicators show workout frequency • Edit workout history to keep your records accurate • See patterns in your training over time SCIENCE-BASED APPROACH • Recovery algorithms based on exercise science research • Different recovery times for various muscle groups • Consecutive training detection to prevent overtraining • Smart workout suggestions prioritize undertrained muscle groups • Balance between intensity and recovery for optimal results DESIGNED FOR EVERYONE • Perfect for gym beginners who need guidance • Valuable for experienced lifters tracking their progress • No advertisements or in-app purchases • Clean, intuitive interface with focus on functionality • Works without internet connection - train anywhere Start your fitness journey today with Fitness Buddy - where science meets simplicity to help you achieve your goals.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.