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.
fyra is a powerful, beautifully designed interval timer built for real workouts
$1.99 · 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 Fyra: Workout Timer: 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 community engagement and social features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options for timers
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No progress tracking features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Monetization may not be clear
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.
fyra is a powerful, beautifully designed interval timer built for real workouts. whether you're crushing hiit, flowing through circuits, or building your own custom routines, fyra keeps you on track with voice coaching, precise timing, and zero distractions. timer that never quits lock your screen, switch apps, check a message — your workout keeps running. fyra announces each exercise aloud so you never have to look at your phone. control playback right from your lock screen. 50+ pre-built workouts ready-to-go routines targeting every muscle group: • chest, back, shoulders & arms • legs, glutes & core • full body & cardio • hiit, tabata, emom, amrap & circuit formats build your own create custom workouts in seconds. set exercises, durations, rounds, and rest periods. save them, favorite them, share them. track your progress • workout history & calendar • streak tracking to keep you motivated • weekly goals with visual progress • muscle recovery suggestions • apple health integration — workouts sync automatically designed for focus • voice announcements for every exercise • countdown alerts so you're always ready • haptic feedback you can feel • clean, dark interface that's easy on the eyes privacy first no account required. no ads. no tracking. your data stays on your device. please consult your physician before beginning any exercise program. fyra is not intended to provide medical advice, diagnosis, or treatment
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.