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.
Turn your Apple Watch into a complete training platform.
$6.99 · 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 HealthFit: 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 food database for nutrition logging
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of social features for motivation
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Performance issues with data sync
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent user onboarding experience
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.
Turn your Apple Watch into a complete training platform. HealthFit transforms the workout and health data stored in Apple Health into advanced fitness metrics, training insights, and seamless workout syncing—with no account required. Whether you're training for your next race, improving your fitness, or simply staying active, HealthFit helps you understand your progress, optimize your training, and achieve your goals. TRAIN SMARTER Go beyond basic workout summaries with advanced training analytics designed to help you make better decisions. HealthFit helps you understand: • Training Load • Fitness (CTL), Fatigue (ATL), and Form (TSB) • Training Load Ratio • Heart Rate Zones and Training Distribution • Year Comparisons and Trends • Explorer Score and Training Heat Maps These are the kinds of metrics and insights typically reserved for premium coaching platforms. EVERYTHING IN ONE PLACE HealthFit combines your workouts, fitness trends, and health metrics in a beautifully designed app. No more jumping between multiple apps. Track your training load, fitness progression, health metrics, and workout history from a single dashboard. A BETTER ACTIVITY FEED Browse all your workouts with maps, photos, and key metrics visible at a glance. Dive deeper into every activity with advanced analysis including: • Customizable Heart Rate Zones • Training Load Tracking • Equipment Tracking (Shoes, Bikes & More) • Elevation, Pace, Power & Cadence Analysis • Detailed Charts & Performance Trends HealthFit can even automatically associate photos taken during your workouts, bringing your activity history to life. POWER INSIGHTS Analyze your running and cycling power with advanced metrics including: • Estimated Critical Power • Weighted Average Power • Mean Maximal Power Curves • Power Distribution Analysis • Historical Power Trends Understand how your power evolves and identify your strengths across different durations. HEALTH METRICS FOR ATHLETES HealthFit provides a focused view of the health metrics that matter most, helping you understand how your health, stress, and fitness evolve over time. • Heart Rate Variability (HRV) • Resting Heart Rate • Cardio Fitness (VO₂ Max) • Sleep Metrics • Weight, BMI & Body Fat • Baevsky Stress Index Everything is presented clearly so you can connect your health trends to your training performance. BUILT FOR EVERY SPORT Most fitness apps focus on running and cycling. HealthFit supports all activity types and automatically adapts its statistics, charts, and analysis to your most frequent activities, whether you specialize in a single sport or enjoy a variety of activities. AUTOMATIC WORKOUT SYNCING HealthFit automatically syncs your workouts in the background to all your favorite fitness platforms. Every workout recorded with Apple Watch is uploaded automatically—no manual exports, no extra steps, no missing activities. You can even sync your entire workout history. MULTISPORT SUPPORT HealthFit fully supports multisport and interval workouts and is one of the few apps capable of exporting multisport activities as true multisession workouts. YOUR DATA STAYS YOURS Privacy is a core principle of HealthFit. No account required. No login required. HealthFit works directly with Apple Health and keeps your data on your device—giving you powerful fitness insights without sending your personal data to the cloud. CONNECTS TO YOUR FAVORITE FITNESS PLATFORMS Supported services include Strava, TrainingPeaks, Final Surge, Selfloops, Smashrun, Ride with GPS, Cycling Analytics, Today's Plan, Runalyze, Suunto, 2PEAK, Komoot, COROS, Intervals.icu, Nolio, TrainAsONE, Tredict, Stages Link, Map My Tracks, and Xhale. Export detailed workout reports to Markdown, complete with charts, maps, and workout insights, or export your data in FIT, GPX, CSV, and Google Sheets formats. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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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.