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.
Researchers manipulate countless variables to figure out what drives hypertrophy and strength
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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 Set Tracker 2: 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: Limited social features for motivation
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inadequate exercise database
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No progress photos feature
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of custom workout plans
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.
Researchers manipulate countless variables to figure out what drives hypertrophy and strength. With Set Tracker 2, you don’t have to depend on their research—you can find out for yourself. Log your weight, reps, volume, intensity, and rest intervals. Track the data, analyze the variables, and discover exactly what works best for your own body and your specific goals. Want to go deep? Use our advanced built-in charts to visualize your growth, or export your raw data to analyze it yourself in Excel or your software of choice. Don't want to play scientist? No problem. Use it as a straightforward logging tool to keep track of your workout history, or simply rely on it to check what set you're currently on (because we all lose count). CORE FEATURES: BE YOUR OWN LAB Track everything: weight, reps, RPE, work time, and rest duration. Export your data to CSV anytime for your own spreadsheet analysis, or let our built-in performance matrix do the math for you. GAMIFIED PERSPECTIVE Stay motivated. Your lifter avatar collects "XP" (tonnage moved and intensity shifts) after every logged set, putting your hard work into perspective in real-time. LIVE ACTIVITY REST TIMERS When you enter rest mode, your timer securely locks into the Dynamic Island and Lock Screen. Browse other apps or lock your phone—the Core Reactor keeps your intervals perfectly timed outside the app. VISUAL CANDY Customize your HUD with 4 distinct interface themes: Cyberpunk (neon data streams), Stealth (ultra-minimal), Minimal (clean native iOS), or Aura (warm and rounded). APPLE WATCH TELEMETRY Leave your phone in your gym bag. The Apple Watch app stays in perfect sync with your iPhone in real-time. Log a set on your wrist, and your phone updates instantly. STRENGTH STANDARDS Input your body weight to unlock your true lifter profile. Track your IPF GL, DOTS, or Wilks scores, and see how your Big Three lifts stack up against global strength standards. ZERO BS GUARANTEE: Set Tracker 2 was built by a lifter, for lifters. • NO Subscriptions or Paywalls • NO Account Creation Required • NO Ads • 100% of your data stays on your device. Initialize your profile, start logging, and find out what works for you.
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.