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.
Build custom interval timers for every workout style
$2.99 · 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 Pure Intervals: Interval 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: Limited customization options for intervals
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No history tracking
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of visual feedback during workouts
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No social or community features
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.
Build custom interval timers for every workout style. Pure Intervals is an interval timer built for HIIT, Tabata, strength training, cardio, and circuit training — or whatever you use a timer for. FEATURES • Simple, distraction-free interface built around the timer • Keeps running when your screen locks or you switch apps • Voice notifications — audible cues announce each interval transition • Alert sounds — tone notifications for interval changes • Save unlimited workout routines — no caps, no restrictions • Create workout Templates or Collections of routines • Peer to peer Workout and Collection sharing • Workout History • Fully offline — no internet connection required • No data collection and no ads, ever • Multilingual — if you are so inclined BUY ONCE. USE FOREVER. Pure Intervals is a one-time purchase. No subscription. No premium tier. No paywall. No features locked behind a recurring fee. Every capability — unlimited saved workouts/collections/templates, background timer, voice notifications, offline use — is included from day one and stays that way. If we add features later, you'll get those too. BUILT FOR EVERY TRAINING STYLE HIIT — Push-rest-push-rest with precise interval control. Program exact work and rest durations down to the second. Whether your HIIT workout is 20 minutes or 45, your interval timer tracks every second. Tabata — Classic 20-second work, 10-second rest cycles with round tracking, or customize any variation. Pure Intervals handles standard Tabata and any modified protocol you prefer. Strength training — Rest timers between sets, work timers for timed lifts, or full circuit sequences. Save your strength training routine once and load it every session. Cardio — Steady-state interval training, tempo intervals, or fartlek-style free segments. Any interval structure, any duration. Circuit training — Chain multiple exercises with separate work, rest, and transition intervals in a single saved routine. Your circuit training timer, built exactly the way you need it. OFFLINE. ALWAYS READY. No internet connection needed. Pure Intervals works anywhere you train: the gym floor, a hotel room, a park, outdoors, a basement. No account to create, no sign-in required, no sync dependency. Build your interval routines once, save them, and load them every session. Unlimited saved workouts. No limits.
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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.