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.
GuitarTuna is your go-to guitar app, with over 100 million downloads and counting! Tune your guitar in seconds with the free guitar tuner, explore guitar chords & tabs for 20,000+ songs, and learn how to play guitar s...
Free · 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 GuitarTuna: Tune & Play Guitar: 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.
GuitarTuna is your go-to guitar app, with over 100 million downloads and counting! Tune your guitar in seconds with the free guitar tuner, explore guitar chords & tabs for 20,000+ songs, and learn how to play guitar songs you love with trainers, tutorials & personalized feedback. Why you’ll love GuitarTuna • Tune any guitar, ukulele, violin or bass perfectly with easy-to-use tuning • Switch seamlessly between guitar tuner, ukulele tuner, bass tuner & more • Get guitar tabs & chords for your favorite songs • Learn guitar songs with trainers, tutorials & personalized feedback • Practice like a pro with essential tools for guitar • Play songs you love at any skill level – guitar beginners included! • Become a better guitar player with an all-in-one guitar app in your pocket How it works • Just pluck a string on your instrument and GuitarTuna detects the sound using your device’s microphone. • You’ll get instant visual feedback while tuning. No cables needed. • With our audio recognition technology, you’ll get insanely accurate tuning. Noise cancellation technology eliminates background noises while you tune. Learn songs with guitar tutorials • Learn guitar songs with video tutorials & interactive trainers • Get personalized feedback to improve your guitar playing • Create your own personalized learning path • Get tips from expert guitarists Play songs with guitar tabs & chords • Explore guitar tabs for 20,000+ popular songs by top global artists • Get pro-quality guitar chords & guitar tabs • Choose guitar tabs & chords for your skill level • Play at your own pace while chords & tabs sync with you • Request guitar tabs & chords for your favorite songs • New guitar songs & tabs added weekly! Tools to practice guitar like a pro • Metronome: Set your tempo & customize your time signature with the metronome tool • Chord games: G chord giving you trouble? Learn, practice & master guitar chords with customizable games. • Ear trainer: Improve your music skills & recognize chords by ear • Chord library: Explore guitar chords with diagrams & audio • Left-hand mode: Easily switch between right & left hand modes Instruments • Guitar • Guitar 7-String • Guitar 12-String • Ukulele • Cavaquinho • Bass • Bass 5-string • Violin • Viola • Cello • Fiddle • Mandolin • Balalaika • Banjo • Banjo 5-String We’ve put a lot of love and effort into making GuitarTuna the tuner it is today. Your feedback is valuable to us, and you can be sure we’re listening. We recently added pro-quality guitar song chords and lyrics to the app because of the sheer amount of requests for them. Play your favorite songs anywhere, anytime, with our entire song library produced by professional musicians. GuitarTuna Pro subscription: Subscribe for unlimited access. Subscriptions are monthly. Prices may vary in different countries. Payment will be charged to iTunes Account. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s iTunes Account Settings. Any unused portion of a free trial period will be forfeited when the user purchases a subscription. GuitarTuna is developed by Yousician. Check out Yousician’s apps to learn and master guitar, ukulele, bass, piano or singing! It’s pretty cool you actually read this far! Here’s a joke for you: What’s the difference between a bass and a tuna? You can tuna bass, but you can’t bass a tuna! Now download the app and see how it is. Send us your feedback on the joke and the app to [email protected]! https://yousician.com/privacy-notice https://yousician.com/terms-of-service
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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 modes compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Ads can interrupt the tuning experience.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Some users report inaccurate pitch detection.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited song library for learning.
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.