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.
Join over 5 million gym-goers getting stronger with Lyfta.
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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 Lyfta: Gym & Workout Tracker: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Join over 5 million gym-goers getting stronger with Lyfta. Track your workouts and create unlimited routines for free, with no ads. See your progress, challenge yourself and make every session count. LOG EVERY SET. MAKE EVERY WORKOUT COUNT. See your previous weights and reps while you train. Record each set without losing focus, then use your workout history to guide what comes next. • Track sets, reps, weight, RPE and notes • Log weight lifting workouts with barbells, dumbbells or machines • Organize supersets, warm-ups, drop sets and failure sets • Stay on track between sets with automatic rest timers • Add custom exercises to match the way you train YOUR WORKOUT PLAN, READY WHEN YOU ARE Walk into the gym knowing what to do. Choose a ready-made program or build your own gym workout routine around your goals, schedule and equipment. Follow a push pull legs routine, organize an upper/lower split or create a full body workout plan. Customize exercises, sets and reps, then return to your saved routine for your next session. TRAIN WITH CONFIDENCE Explore 5,000+ exercises with video demonstrations and search by muscle group or equipment. Build your bodybuilding routine or find an alternative exercise when equipment is busy, so you can keep your workout moving. SEE YOUR HARD WORK ADD UP Track personal records and see how your weights, reps and training volume change over time. Compare sessions, explore strength graphs and check your estimated one-rep max. Make progressive overload easier to follow: use your previous performance as a starting point and work toward another rep, a little more weight or your next personal best. NEW TO STRENGTH TRAINING? Start with a beginner-friendly gym routine and learn each movement with exercise videos. Keep your workouts organized and track your progress as you get more comfortable lifting. Training at home? Create dumbbell workouts or bodyweight sessions around the equipment you have. MORE REASONS TO KEEP SHOWING UP Follow friends, share workouts and celebrate personal records together. Monthly challenges, streaks and milestones help you stay connected to your training. Choose a public or private profile to control what you share. CONNECT YOUR TRAINING Log workouts with Apple Watch, sync with Apple Health and share completed sessions to Strava. Access your training faster with widgets and shortcuts. GO FURTHER WITH LYFTA PREMIUM • Train smarter with advanced workout insights • See your all-time progress • Follow expert workout programs Download Lyfta and start building on your progress, one workout at a time. Lyfta offers optional Premium subscriptions that renew automatically unless canceled. Prices are shown before purchase. Manage or cancel subscriptions in your Apple Account settings. Privacy Policy: https://www.lyfta.app/privacy Terms of Service: https://www.lyfta.app/terms
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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 exercise library and customization options
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Cluttered UI with too many options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inconsistent performance tracking
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No social features for motivation
Validate with people who use this workflow before building.
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.