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 drumming into a workout — and your Apple Watch into a timing coach.
$3.99
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.
Kit ready. Verify your email to download it.
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 DrumPulse: Drum Timing Coach: 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.
Turn your drumming into a workout — and your Apple Watch into a timing coach. DrumPulse listens to the motion of your snare hand, turns every strike into data, and gives you two things at once: a real fitness record and an honest report on your time. No extra gear, no mics — just your watch. ARE YOU RUSHING OR DRAGGING? A live groove meter swings as you play: orange when you push ahead of the beat, blue when you fall behind. At the end of each set you get an "in the pocket" score and a clear breakdown of how many hits landed early, on time, and late. TWO WAYS TO PRACTICE • Metronome — set a tempo and every hit is graded against a steady click, like a timing trainer. • Free Play — no click needed. DrumPulse learns your own groove and flags when you speed up or slow down relative to yourself. THE STORY OF YOUR SET Averages lie — your set has an arc. DrumPulse reads the shape of the whole night: • Set-arc trend — did you fade or hold up? "Hit strength held steady; timing tightened (±28 → ±25 ms)." • In-song tempo drift — the per-song average hides a climb from 105 to 115. DrumPulse measures the slope inside each song: "Tempo climbed inside 13 of 21 songs — watch the push." • Playing time — how much of the set you actually played, and your longest unbroken run. • Dynamic range — the strength gap between your ghost notes and accents, as a ratio (5.7× soft to loud). • Accent lag — do your hard hits land later than your soft ones? A habit mean deviation hides. DRUMMING IS CARDIO Every session is saved to Apple Health as a workout, with duration, heart rate, and active energy — your practice adds to your activity rings. Beyond the basics: • Heart-rate recovery one minute after you stop — a real fitness marker. • Time-in-zone across the whole set. • Loudness (average and peak dB) from the watch's own hearing sensors, with a warning when a set runs loud enough, long enough, to matter. KNOW YOUR PLAYING • Live tempo (BPM) from the timing between your hits. • Dynamics — every hit sorted into ghost, body, and accent relative to your own touch. • Per-song breakdown — a long set splits into songs on the natural pauses, each with its own tempo, timing, and dynamics. • Calibration — tap eight times and DrumPulse sets its sensitivity from your real strikes. • Honest pauses — take a water break and the clock, calories, and grading all freeze. ON YOUR PHONE, TOO The DrumPulse iPhone companion pulls your sessions off the watch so you can review them on a bigger screen — trends across sets, personal bests, and the full detail of any session. Weight and intensity sync from the phone, so calories stay right. PRIVATE BY DESIGN No accounts. No tracking. No analytics. No servers. Your motion and heart-rate data are used on your device only and never leave it; sessions sync solely between your own watch and iPhone over Apple's encrypted connection. Built by a gigging drummer, for drummers. Strap on your watch, hit play, and find your pocket. Note: Apple Health has no "drumming" workout type, so sessions appear as Other (branded Drumming) in the Fitness app.
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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: User interface can feel cluttered with too many options.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited feedback on progress and improvement.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of personalization options.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No social features to connect with other drummers.
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.