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.
The Note Recognizer - A 440 Hz easily analyses the pitch frequency that you sing or play, and gives the corresponding note name quickly and accurately
$1.99
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.
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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 Note Recognizer - A 440 Hz: map the core Entertainment 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 functionality with only basic note recognition.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user interface and user experience.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of educational resources for users.
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.
The Note Recognizer - A 440 Hz easily analyses the pitch frequency that you sing or play, and gives the corresponding note name quickly and accurately. Works great for vocals, piano, guitar, violin, and more! This 440 Hz tone is A in the musical scale. This tone is good for tuning or keeping a reference to A. The Sine wave has no overtones so it is sometime called pure as it is only the fundamental frequency. Play your musical idea on an instrument and have it transformed to musical notation. Your microphone detects your voice or instrument, and then converts that sound into an electrical signal. That signal is then interpreted by our app and the frequency of that sound is deciphered and displayed along with the corresponding musical note. Very useful for singers who need to find the right starting note of a song. Or if you want to know the key of a song; sing the tonic, and you get the note name of the key. What instruments will this pitch detector work with? - Our Note Recognizer app will work with most instruments and vocals. Recognition range: E2 - G7. Whistling above this range wil not be recognized. The quality of the microphone of your device may influence the performance of the app. If you looking for vocal training and do you have little or no singing experience or voice training? Then we recommend Note Recognizer.
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.