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.
Sharpen your sense of time! liveBPM is the tempo monitoring tool for drummers, bands and DJs
$3.99 · 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 liveBPM - Beat Detector: 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: Inaccurate beat detection in noisy environments.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited history management options.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social sharing features.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited user settings for customization.
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.
Sharpen your sense of time! liveBPM is the tempo monitoring tool for drummers, bands and DJs. It detects music and beats via the microphone and continuously displays the current tempo in beats per minute (BPM). It is easy to use and delivers high-quality results while being energy efficient. === What users said about liveBPM === John Walden, freelance musician and music technology journalist at musicappblog.com: "There are three obvious applications for the app. First, it would make a brilliant practice tool for a drummer, allowing them to monitor just how good they are at keeping a steady tempo without the aid of a click track to guide them. Second, sat beside your kit during a performance, it would allow you to judge just how well you are hitting the ideal tempo for each song in your set. It’s not just drummers that can benefit for liveBPM as the third use is in mapping the tempo – and any tempo changes – in commercial recordings. While this is useful for drummers, it is instructional for almost any musician." JonLong: "I used this at my last band practice and wasn't expecting it to work. I couldn't believe how quickly and accurately it started tracking the bpm, even despite the very loud volume of our music." PocketDrummer82: "I am a professional drummer and I have been looking for something like this for years! Unless your playing with backing tracks or recording, Playing with a Click is too Mechanical. This app allows the tempo to breathe, and its like a little angel on your shoulder telling you the band is speeding up or slowing down. It is totally worth the money." Chris Walther: "I have used this about five gigs now and have quit using my previous tempo meter. I used both for a few gigs to test the accuracy. Dead on. Thanks! Every drummer should use this." magrec: "This has been very helpful for recording. thanks!" === Detailed Description === This is a tool designed for professional use: - Well-tested beat detection engine guarantees trustworthiness - Can handle most genres - Produces results accurate to within 0.1 BPM under the following conditions: -- The tempo is constant or almost constant -- Strong impulses are defining the beat (drums, accentuated rhythm instruments like bass/guitar, etc.) Further features: - Tempo curve shows the development of tempo over time - Multiple zoom modes to show last 2, 3, 5, 7, 10, 15, 20 or 30 minutes - Advanced audio spectrum analysis via FFT - More accessible and usually more accurate than BPM counters that function through tapping - Low battery drain thanks to high performance code and efficient algorithms Using it as a musician: - Use it as an objective tempo reference like a metronome - It actually has several advantages over a metronome: -- You are not tied to a click, giving you more flexibility -- Helps you use tempo changes to enhance your musical expression -- With blind tests, it can massively improve your timing confidence, which is especially important if you are in a tempo leading role (e.g. drummer) - Discover how/whether your favorite artists use tempo changes - Measure and improve your time-keeping skills - Identify slowdowns and speedups while practicing your instrument - Always be in control of the tempo during your live gigs and rehearsals Controls: - Power Button: For freezing the tempo curve and minimizing battery drain - Clear Button: Clears the tempo curve - Slider: Adjusts the target tempo range (i.e. 80-160 BPM) - Zoom Buttons: Switch between zoom modes for the tempo curve. (2-30 minutes) Note: - You can check and improve the detection by clapping loud to the beat. Also, results can be improved by plugging in a suitable external microphone. - You can support my work by rating it on the App Store. If you have questions and/or suggestions, feel free to contact me via e-mail or facebook.
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.