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.
Better Ears is the complete ear training and sight‑reading workout for musicians, students and teachers
$4.99 · 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 Better Ears - 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: Can't play offline
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Algorithm doesn't understand taste
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Shuffle-only on free tier
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.
Better Ears is the complete ear training and sight‑reading workout for musicians, students and teachers. Train your musical ear and master music theory — from interval recognition all the way to chord progressions and rhythm training. 15 exercises take you from absolute beginner to pro, at your own pace, with no rules and no pressure. NEW: RHYTHM TRAINING Sharpen your sense of timing with two brand‑new exercises. Hear a rhythm and clap or tap it back, or read rhythmic notation and perform it in time — with count‑in, metronome, triplets and time signatures like 3/4, 4/4 and 5/4. Clap straight into your device's microphone and Better Ears listens. YOU DECIDE HOW TO TRAIN There are no rules to follow. You decide when to start, what to practice and how often. 15 EXERCISES INCLUDED • Interval recognition • Scale recognition • Chord recognition • Chord progressions • Pitch recognition • Melodic dictation • Tempo recognition • Key signature recognition • Music reading • Interval music reading • Scale music reading • Chord music reading • Melody music reading • Rhythm recognition (new) • Rhythm reading (new) ANSWER WITH YOUR VOICE OR A REAL INSTRUMENT Built‑in pitch detection lets you answer by singing or by playing a real instrument (e.g. piano or guitar). Just sing or play the notes when the microphone button lights up red. CUSTOM CHORDS, SCALES & CHORD PROGRESSIONS The built‑in editor lets you add your own chords, scales and chord progressions. FOUR PRESET LEVELS + UNLIMITED CUSTOM LEVELS Start at Beginner, Easy, Normal or Professional — then build your own levels to focus exactly where you need to: church modes, those two pesky intervals, custom rhythms, whatever you like. 6 INSTRUMENTS & CUSTOM SOUNDFONTS Train with Acoustic Grand, Bright Acoustic Piano, Electric Grand, Drawbar Organ, Nylon and Steel Acoustic Guitar — or extend Better Ears with your own sounds via SoundFonts (.sf2). KEYBOARD & FRETBOARD Answer on a virtual piano keyboard or a virtual guitar fretboard. MIDI SUPPORT Route sound through an external MIDI device and even control Better Ears with a connected master keyboard. SYNC ALL OF YOUR DEVICES Keep your Mac, iPhone and iPad in sync via Dropbox. You choose what to sync: your own levels, your statistics, your settings — or all of it. STATISTICS Better Ears tracks your progress for every exercise and every question — right and wrong answers at a glance. WIKIPEDIA INTEGRATION The matching Wikipedia article is shown for each exercise, so the theory is always one tap away. REFRESHED DESIGN A modern, fully redesigned interface on iPhone, iPad and Mac — with full Dark Mode and crystal‑clear music notation.
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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.