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.
Tuner & Metronome is the best free app for musicians.
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.
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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.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Tuner & Metronome is the best free app for musicians. The most accurate chromatic tuner and professional hands-free metronome. Designed by musicians - superfast and simple! [NEW] 4,000+ free sheet musics are available. Even one touch can: • Start / stop the metronome • Set a combination of sound / flash light / vibration / visual beats • Turn on tuner • Record your playing • Select rhythm patterns • Use black screen battery-saving mode ========================================== Features • Tuner with 2 modes: (1) chromatic tuner measuring sound pitch and intensity (2) pitch fork mode • Customizable A4 frequency (440Hz by default) • You can upload your sheet music through our app. You can record and practice playing while watching uploaded sheet musics. • Our app never lags beats: a real metronome shouldn't lag. • Able to record your playing with integrated one touch recorder Flash light metronome mode • If the sound of the metronome is hard to hear due to the speaker volume limit or loud background noise, use flash light metronome mode. In this mode, you can easily feel the beats with flashes of light. Project the flashlight to the wall, then the entire wall can flash the beats. Large and simple button • Start or stop the metronome with a big button whenever you want More features • Supports all instruments, such as active piano, guitar, ukulele, mandolin, violin, cello, viola, bass, drum, flute, harmonica, etc. • Supports all kind of transposed instruments, including B-flat clarinet, F horn, E-flat saxophone, D-flat piccolo, and many others. • Precise beats per minute (BPM) control • BPM detector • Practice time tracker • High precision tuner • Visual metronome mode using flash light of the camera • Tuning fork, pitch pipe About permissions • Access to camera is required for flash light metronome, access to phone status is required to stop the metronome when a call is incoming, access to microphone is for recorder and tuner, and access to storage is for recorder. In-app purchase • We offer a free version with ads and in-app purchase for ads removal. • Title of the product: "Remove Ads for 1 month" • Length of subscription (time period and content or services provided during each subscription period) is 1 month • Payment will be charged to iTunes Account at confirmation of purchase • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period • Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings 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 Terms of Use: https://soundcorset.com/public/termsofuse.html Privacy Policy: https://soundcorset.com/public/privacypolicy.html
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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.