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.
Tenuto is a collection of 24 highly-customizable exercises designed to enhance your musicality
$4.99 · In-app purchases
Evidence scope: #98 is the current overall US Paid chart position. 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 Tenuto: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Tenuto is a collection of 24 highly-customizable exercises designed to enhance your musicality. From recognizing chords on a keyboard to identifying intervals by ear, it has an exercise for you. Tenuto also includes six musical calculators for accidentals, intervals, scales, chords, analysis symbols, and twelve-tone matrices. A short description of the exercises and calculators follows. –––––– • Note Identification • Key Signature Identification • Interval Identification • Scale Identification • Chord Identification Tap the button corresponding to the written staff line. For example: if shown a C, E, and G with a sharp; tap the "Augmented Triad" button. –––––– • Note Construction • Key Signature Construction • Interval Construction • Scale Construction • Chord Construction Construct the specified label by moving notes and/or adding accidentals. For example: if shown a C and an "Augmented 4th" label, move the second note to F and add a sharp. –––––– • Keyboard Reverse Identification Tap the piano key corresponding to the written note on the staff. While similar to Note Identification, this exercise uses a piano keyboard rather than note name buttons. • Keyboard Note Identification • Keyboard Interval Identification • Keyboard Scale Identification • Keyboard Chord Identification Tap the button corresponding to the highlighted piano key(s). If the C and G keys are highlighted, tap the "P5" (Perfect 5th) button. –––––– • Fretboard Note Identification • Fretboard Interval Identification • Fretboard Scale Identification • Fretboard Chord Identification Tap the button corresponding to the marked fretboard position(s). If the 2nd fret of the D string is marked, tap the "E" button. –––––– • Keyboard Ear Training • Note Ear Training Listen to the played reference and question notes. Select the piano key or note button corresponding to the question note. • Interval Ear Training • Scale Ear Training • Chord Ear Training Tap the button corresponding to the played notes. If E and F are played, tap the "Minor 2nd" button. –––––– • Accidental Calculator Display the accidental for a note and key. • Interval Calculator Display the interval for a note, type, and key. • Chord Calculator Display the scale for a tonic and scale type. • Chord Calculator Display the chord for a note, type, and key. • Analysis Calculator Display the chord for a symbol and key. • Matrix Calculator Display the twelve-tone matrix for a specified tone row.
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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 variety of exercises compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social features for sharing progress or achievements
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization for exercises
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Single purchase model limits accessibility
Validate with people who use this workflow before building.
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.