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.
Yet another ear-training app? Well, this one is different!
$5.99 · 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.
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Combine features and design from your favorite apps.
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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 ET - Ear Trainer: 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 exercises can lead to boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social features for sharing progress.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization options for exercises.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No feedback mechanism for exercises.
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.
Yet another ear-training app? Well, this one is different! Playing jazz, pop and improvised music means being able to quickly recognize and replay what you hear. Although this app began as an ear-training tool for students of jazz and pop at the Zurich University of the Arts (ZHdK), it is also intended for musicians playing in other styles, and at all levels. It was developed by Swiss IT specialist and jazz trumpeter Daniel Schenker, professor at ZHdK, in collaboration with his son Elia. How it works The app offers a host of ear-training exercises, many of them quite enjoyable, all designed to enhance both active and passive hearing. Active hearing means reproducing what you have heard on an instrument or with your voice, while passive hearing refers to the ability to identify such things as the scales, triads and four-note-chords, tensions and slash chords, on which active hearing is based. One of the features that make our app so special is the fact that its microphone enables a sort of dialogue between the app and the musician – whether on voice, brass and reed instruments, guitar, piano or electric bass. Unlike other apps, this one uses an integrated voicing generator to ensure that the chords played (position, voicing) correspond to the actual performance situation. In addition, the app uses a detailed educational guidance system, which allows users to individually customize the exercises. You can obtain over 270 achievements. Compete with other users and publish your high scores and trophies! Active exercises (microphone) - Five-tone range imitation, major and minor: suitable for younger students or amateurs - Diatonic imitation: reproduction of notes in a particular key, vocally or on an instrument - Atonal imitation: improvement of relative or referential hearing - Tone sequences (2 - 6 tones) - Intervals - Resolution game: technique for the improvement of downward interval singing or playing - Bass imitation exercises: double bass notes and root notes of various chords are to be reproduced vocally or on an instrument, a central skill that is often underdeveloped - Sing or replay chord tensions (e.g. #9, b13) - Scales sandbox: imitation practice in tonal spaces from over 40 different scales - Tonal memory game Passive exercises (identification practice) - Intervals - Triads/four-note-chords in root position and inversion; top note positions - Four-note-chords with one tension (17 types) and with two tensions (15 types) - All 12 major and minor triads above a root note (slash chords/hybrids) - Identification of scales, modes and over 140 jazz, pop and classical chord progressions Depending on the setting, the chords can also be played arpeggiated. The app supports Bluetooth MIDI (iPhones only). For whom is the app intended? - Singers both amateur and professional who want to incorporate (noteless) ear training exercises into their practice programme. - Musicians in primary and secondary school, musicians and singers preparing for university entrance exams (practical theory), and conservatory students - Musicians and singers of all genres, especially jazz/pop/rock, who want to freshen up or expand their chord vocabulary - Brass players: control in mouthpiece exercises (buzzing)
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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.