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.
The hidden gem for musicians, from beginners to pros.
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 Chord ai - Play any song!: 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 song uploads in the free version
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Ads can interrupt playback
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Chords may not sync perfectly with songs
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: User interface can be cluttered
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.
The hidden gem for musicians, from beginners to pros. Chord ai is the perfect tool for playing and learning any song. With recent advancements in artificial intelligence, Chord ai provides highly accurate chord recognition, beat tracking, voicing and lyrics for any song instantly and reliably. Say goodbye to tedious web searches for chords and hello to easy access to your favorite songs on YouTube, SoundCloud, your audio files, or even by using your device's microphone. With Chord ai, improve your playing skills and train your ear with numerous features tailored to every level of musician. ** BROWSE ANY SONG ** - You can select any song by browsing your audio files, SoundCloud or YouTube. This is the preferred way and each song will be processed in a few seconds only - Or you can use your device microphone to get the chords in real-time of any song playing around you or from your own playing ** CHORD & VOICING RECOGNITION ** - State-of-the-art chord recognition: Chord ai recognizes common chords such as major, minor, augmented, diminished, 7th, M7th, sus2 and sus4 chords. In the pro version, you also get advanced chords such as half-dim, dim7, 6/9/11/13, add9/11/13 and many more complex jazzy and other beautiful chords such as 69, 11b5, 13b9, 9sus4, min7add13 etc. - Slash Chord Recognition: Chord ai tells you the bass/lowest note of each chord using the slash notation. [Pro version] - Voicing & Position recognition: Chord ai is the world's first app capable of recognising not only chords, but also their specific voicing. This means that Chord ai can tell you more precisely which notes should be played, including their octaves, and which positions match best with the song [Pro version] ** LYRICS RECOGNITION ** - On-device lyrics recognition using the latest advances in the field of speech recognition. Nearly 100 languages supported including English, Spanish, Japanese, Portuguese and many more! ** BEAT TRACKING ** - Chord ai uses state-of-the-art beat tracking algorithms to display chords organised into bars and beats ** SEPARATION INTO MULTI TRACKS ** - Automatic music separation into 4 stems: Bass / Drums / Vocals / Other ** MIDIFY ** - State-of-the-art audio to midi conversion - Export midified audio as a midi file ** ADVANCED REPLAY CONTROLS ** - Speed change: Slow down or speed up playback at your wish so that you can play easily along the song - Pitch shift: Change the pitch of the song to play in your desired key - Loop: the interface for setting loop start/end points is very simple and intuitive ** SAVE & SHARE ** - Saved songs and playlists are synchronised among all your iOS devices - Export transcriptions as PDF files. You can control the number of bars per line as well as whether you want to display lyrics and/or positions ** PIANO / GUITAR / UKULELE / BASS / MANDOLIN / BANJO ** - Select your preferred instrument among always growing list of supported instruments - Smart capo: you can also let Chord ai tell you preferred capo for either easiness of play of song matching [Pro version] ** LEARN NEW AND BEAUTIFUL CHORD POSITIONS ** - Find and learn chords from Chord ai's massive chord positions library (more than 100k guitar positions and more than 10k ukulele positions) - Positions ranked from easiest and common to most difficult and rare - Alternate tunings for guitar / ukulele / banjo / mandolin such as Drop D, DADGAD, Open D/G/A/C etc. [Pro version] Any feedback appreciated at [email protected] Privacy policy: https://chordai.net/privacy-policy/ Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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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.