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.
Lighten your gig bag! GuitarToolkit delivers all your essential guitar tools—tuner, metronome, chords, scales & arpeggios
$2.99 · 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 GuitarToolkit - tuner, metronome, chords & scales: 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 tuning options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user interface and navigation experience.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social features for sharing progress or achievements.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High crash rate and slow performance.
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.
Lighten your gig bag! GuitarToolkit delivers all your essential guitar tools—tuner, metronome, chords, scales & arpeggios. Supports all your instruments! 6-, 7- and 12-string guitar, 4-, 5- and 6-string bass, ukulele, banjo and mandolin, each with standard & alternate tunings. FEATURES ■ Tuner, chords, scales & arpeggios automatically adapt for the selected instrument & tuning. ■ Superb chromatic tuner, every bit as accurate as dedicated hardware tuners but far more flexible. ■ Massive library of over 2,000,000 chords, scales and arpeggios. Strum chords and tap notes to hear what they sound like. ■ Precision metronome can run in background while using other GuitarToolkit features or other apps. ■ Chord finder answers the question, "What chord is this?" ■ Universal: buy once and use on your iPhone, iPad & iPod touch ■ And so much more! THE GUITARTOOLKIT+ UPGRADE ENABLES: ■ Chord Sheet Creation & Editing: Create chord progressions from GuitarToolkit's vast 2,000,000 chord library. Tap to add chords, easily email your Chord Sheets to bandmates or students. Interactive chord playback, just touch to hear your chords play. ■ Drum Pattern Creation & Editing: Create rich, exciting drum patterns for practice and jamming. Custom-build patterns with up to 32 tracks and 75 different drum sounds. ■ Custom Instruments: Create virtual instruments inside GuitarToolkit that look and sound like your real-life instruments! ■ NEW: Jump start your chord & rhythm skills! The Chord Sheet Store delivers professionally-crafted learning content based on GuitarToolkit's powerful interactive Chord Sheets. ■ The most comprehensive & highly-rated guitar tool in the App Store! ■ Best-of-breed tuner, huge chord / scale / arpeggio library, flexible metronome
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.