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.
Tempo is the bestselling and most accurate metronome on the App Store
$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 Tempo - Metronome with Setlist: map the core Music 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: Users find metronome settings confusing
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited features for song management
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline access
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.
Tempo is the bestselling and most accurate metronome on the App Store. Featured as "New and Noteworthy" and "Staff Favorite" by Apple on the main iTunes landing page. If you'll like to try Tempo out before purchasing, download Tempo Lite for free now. Ever since its release, Tempo has been consistently in the top 100 of the Music category in over 30 countries, and the top paid metronome app in most countries. Tempo's engine is written from the ground up for high accuracy and stability. It keeps going even in device lock mode, making it a useful aid for live drumming. Tempo features an innovative interface that morphs between modes that each presents a different combination of functionalities optimized for the task at hand. Five modes are available on the iPhone: Basic, Preset, Setlist, Practice and Gig. On the iPad, Preset, Gig and Complete modes are available, the last providing access to all controls. Visit www.frozenape.com for demo videos. Features Summary Configuration • 35 different time signatures, including compound and complex meters: 1-13/2, 1-13/4, 3/8, 5/8(2 variations), 6/8, 7/8(3 variations), 9/8, 12/8 • 6 rhythm patterns for simple meters and 3 for compound meters • Customize accents or turn beats off to create more complex rhythms • Tap tempo function • Tempo ranges from 10 to 800 Display • Visual feedback in the form of pulsating LEDs • Two pendulum types, each with two animation types • Flash whole screen • Fullscreen display mode with gesture controls Setlists • Store presets in multiple setlists • Advanced setlist management including search, overwriting, copying between setlists and multi-deletion • Quick editing • Share setlists via email • Backup via iTunes File Sharing Tracker and Automator • Track number of bars played or time your practice • Stop playback automatically when limit reached • Up to 2 bars of voice count in • Automatic adjustment of tempo every n number of bars or n amount of time • Loop and auto advance through setlists • Coach Mode alternates between unmuted and muted bars Sound • Choose from 14 sound sets, including one optimized for live drumming click tracks • Voice counting • Vibration mode • Pan audio left, right or centered • Volume control and mute button Control • Control setlists, tempo and playback with AirTurn, iRig BlueBoard, PageFlip Cicada, headphones remote and other accessories • Assign action to proximity sensor trigger Miscellaneous • Classical metronome and Italian tempo markings • Pitch pipe for playback of all 12 chromatic pitches (calibration from A = 414 to 466 Hz) • Multi-tasking support: plays in background, with audio from other apps • Four color themes • Theme Editor to create unlimited custom themes
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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.