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.
DRUMS ARE COMPLEX
$12.99 · 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 iDrumTune Precision Drum Tuner: 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: Limited presets for different drum types
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Occasional accuracy issues in noisy environments
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of community features or sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline mode for tuning
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.
DRUMS ARE COMPLEX. TUNING SHOULDN’T BE. It's an app and a training course - everything you need to become a drum tuning pro! This latest version has been completely rebuilt from the ground up & introduces new onboard coaching, tone training, and an in-app masterclass. Start learning today with the app and the drum tuning essentials covered in lessons one to five of our drum acoustics training masterclass, free of charge at www.learndrumtuning.com. "an invaluable aid not only for drummers but also studio engineers and producers" - Sound on Sound Magazine "I can’t recommend this app highly enough ... for the money, it is indispensable. It's simple, accurate, looks good, and the tuning information is worth the cost of the app alone." - www.mikedolbear.com “***** I never knew I could have this much fun tuning drums!” – Adamrod (App Store review) “***** Just tuned my first drum and this app is awesome!” – bburt85 (App Store review) “***** Buy this app if you are a drummer!!!” – Lildrummerboy (App Store review) The original and most innovative drum tuning app - iDrumTune brings an unrivalled accuracy and a host of unique features for assisting with drum tuning. Built by world experts in drums and musical acoustics, iDrumTune is backed up by an integrated, progress-tracked AES-published masterclass on Drum Sound and Drum Tuning. iDrumTune includes the following features: Pitch Tuning – to make your drums sing and allow you to play musical phrases around the kit. Lug Tuning – to ensure that the drumhead is evenly tuned and gives a smooth and warm tone. Resonant Head Tuning – to allow you to be sure that the two heads are working together and giving rich overtones. In-App Coach – an intelligent on-screen assistant guides you through the tuning process in real time, helping to prevent false readings and guarantee success on your very first try. Spectrum Analyzer – so you can really start to understand what frequencies are excited and heard when playing the drums. Native LEARN Masterclass – our complete, world-class drum acoustics masterclass integrated natively into the app's LEARN tab, allowing you to track progress as you tune. Ear-Tuning Development – a responsive, keys-based tone generator to help you develop the active listening skills required for unassisted ear-tuning. Drum Kit Presets & Cloud Sync – save and load your favourite custom kit configurations via the interactive Drum Kit Designer, synced cross-platform to recall setups in seconds. iDrumTune is the first and by far the most intelligent and accurate system for analysing drum sounds and assisting tuning – developed by drummers, music producers and acoustics research Professors. iDrumTune provides you with a measurement of the drumhead vibration frequency; in Pitch Tuning mode, you simply hold your device over the center of a drum, about 2-4 inches away, then strike the drum in the center. iDrumTune shows the recorded sound waveform in real time and gives the strongest frequency recorded. There is also a tuning indicator bar which shows the drumhead tuning relative to musical notes, so iDrumTune can be used to ensure that your drums are in key with each other or the song you are playing. A frequency spectrum view also allows more detailed analysis. Our updated under-the-hood algorithms optimise detection between center and edge strikes, whilst Lug Tuning mode offers the simplest and most innovative method for tuning an even frequency response at the lug positions on the drumhead. Drum Tuning isn’t easy, and drums don’t respond exactly the same way every time you hit them. For that reason, it's valuable to know a little about the science of drum tuning. iDrumTune includes the complete, natively integrated drum acoustics masterclass in the LEARN tab to help you get the best from the app and become an expert drum tuner! Access the drum acoustics essentials covered in lessons one to five, free of charge, at www.learndrumtuning.com.
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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.