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 3 million gym and fitness enthusiasts and lift more with Lyfta – the free workout tracker, gym log, and strength training planner.
Free · 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 Lyfta: Gym Workout Tracker Log: 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 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.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Join over 3 million gym and fitness enthusiasts and lift more with Lyfta – the free workout tracker, gym log, and strength training planner. Log your workouts, build routines, and track progress so you can focus on what matters most: getting stronger. What Our Users Are Saying: • "I've tried probably 10 different gym apps over the years, and none of them clicked for me until Lyfta. It's crazy how much is available for free, from the unlimited custom free routines to their massive exercise library. It just has everything you need to actually stick with it." – Ryan • "I love how simple it is to plan my workouts in Lyfta. I used to feel lost at the gym, but the guided exercises keep me on track. And seeing my progress with the stats has me getting stronger every single week. It's so motivating!" – Kady • "Lyfta has made a huge difference in my consistency. I've never been able to stick with a routine until now. Seeing my friends' workouts and jumping into the community challenges gets me excited to come back, and I've honestly made some serious gains since I started." – Rojaas Why choose Lyfta? • Free, simple, and ad-free workout tracker • Create and customize weightlifting programs & gym routines • Track progress in strength, volume, sets, reps, and PRs • Stay motivated with friends, challenges, and milestones Powerful Gym Workout Tracking • Log sets, reps, weight, RPE, and notes in seconds • 5,000+ exercises with HD video guides for perfect form • Build unlimited custom programs or follow proven ones like StrongLifts 5x5, nSuns, GZCL, Push/Pull/Legs, Rp Hypertrophy, German Volume Training, and more. Note: Lyfta is not affiliated with, endorsed by, or sponsored by any of these gym programs. • Add your own custom lifts with muscle groups & equipment • Track advanced sets: warm-ups, drop sets, supersets, and failure sets • Auto rest timers keep your sessions efficient • Built-in One-Rep Max calculator for all major lifts Stay Motivated & Connected • Share workouts, routines, and progress with friends • Follow your training partners and cheer them on • Monthly strength challenges and global leaderboards • Streaks and milestones to celebrate every achievement • Privacy controls: choose public or private profile Integrations & Compatibility • Apple Watch support for live workout tracking • Quick widgets and shortcuts for faster logging • Sync with Apple Health and Strava, • Seamless data sync across all devices If you like Lyfta, try Lyfta Pro free for 14 days! Unlock advanced analytics, expert programs, and progression tools to hit new personal bests. If you choose to purchase Lyfta Pro, payment will be charged to your Apple account, and your account will be charged for renewal within 24-hours prior to the end of the current period. Auto-renewal may be turned off at any time by going to your settings in the App Store after purchase. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Whether you’re starting your first strength program, building muscle, or chasing new personal records – you belong here. Download Lyfta today, log your training, and reach your goals faster. Privacy Policy: https://www.lyfta.app/privacy Terms of Service: https://www.lyfta.app/terms
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.