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.
Practice and perform jazz standards on another level with Quartet.
$16.99 · 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 Quartet 6: 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: User onboarding can be confusing, leading to high drop-off rates.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Collaboration features may lack real-time updates.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited music playback options can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Monetization can be unclear, making users hesitant.
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.
Practice and perform jazz standards on another level with Quartet. And with a host of brand-new features, the top-selling jazz standards play along apps just got even better. No subscriptions. No in-app purchases. Quartet Volume 6 includes another 100 stunning jazz standards recorded exclusively by 5 of the world’s best jazz musicians. All ‘live’ studio recordings with intros, endings and top line solos. Whether you play jazz piano, guitar, saxophone, trumpet, bass, drums…simply mute your instrument from the Quartet for the ultimate jazz play along. And for jazz singers too, each edition of Quartet is an unrivalled collection of jazz backing tracks powerful enough to gig with. Change key on the fly. Speed up or slow down the audio seamlessly. Loop sections and slow them right down for practice. Select the number of repeats. Choose from either preset mixes (8 per song) or create your own custom mix using the new onboard mixer. Arrange each song exactly the way you want it with the new automated ‘Arranger’ feature enabling different mixer channel settings for each song repeat. Add a touch of reverb and you’re good to go. Improve your skills with full screen animated chord diagrams for Piano, Guitar and Ukulele. Finding songs is easy with the ‘Search+’ feature. Search the entire Quartet song library (650 songs) by composer, style, BPM, associated artist and more. Build and share stunning multi-app playlists and easily export PDF chord charts for every song. Export your stereo mix or export the multitrack if you want to remix or develop the high quality separated parts in GarageBand or whatever DAW you use. Either way, all recordings are offered to you royalty-free giving you endless creative possibilities. Quartet Volume 6 includes jazz improvisations in the style of… ‘Afternoon in Paris’, ‘Ain’t She Sweet’, ‘All The Things You Are’ (3/4 and 5/4), ‘Autumn Leaves’ (3/4, 7/4 and Bossa), ‘Epistrophy’, ‘Giant Steps’ (Bossa), ‘Groovin’ High’, ‘I Got Rhythm’ (Latin), ‘Let’s Get Lost’, ‘Mas Que Nada’, ‘Milestones’, ‘Mo’ Better Blues’, ‘One For My Baby’, ‘Stormy Monday’, ‘Tricotism’, ‘Try a Little Tenderness’, 'Vivo Sonhando’ plus 80 more songs! Install Quartet on all of your iOS devices plus your Mac devices (M series only) at no extra cost. Ready to take your jazz standards to another level? Hear more at www.quartetapp.com Featured artists Guitar Nigel Price Nigel has recorded with many big-name artists, performing on over 50 albums, most recently Van Morrison’s studio album ‘Keep Me Singing’. A former member of The James Taylor Quartet, Nigel was voted the UK’s ‘Best Guitarist’ in the 2016 British Jazz Awards and is “…probably the most dynamic and gifted guitarist on the British jazz scene today” [All About Jazz]. Saxophones /Flute Andy Panayi Performing and recording credits include Shirley Bassey, Jessye Norman, Paul McCartney, Seth MacFarlane, Elaine Paige, Salena Jones, Elvis Costello, Georgie Fame, Irene Reed, Elaine Delmar, Helen Shapiro, Madeline Bell, Patty Austin, Freddie Hubbard, Wynton Marsalis, Joe Lovano, Roy Hargrove… Piano Graham Harvey Credits include Incognito (MD), Stacey Kent, George Benson, M People, Hamish Stuart, Will Lee, The Jones Girls, Philip Bailey, Chaka Khan, The BBC Big Band, Omar, Madeline Bell, Jocelyn Brown, Mica Paris, Kenny Thomas, Sir Cliff Richard… Bass Geoff Gascoyne Credits include Jamie Cullum (MD), Sting, Van Morrison, Bill Bruford, Mari Wilson, Paloma Faith, Georgie Fame, Gloria Estefan, Guy Barker, Charlie Watts, Chris Standring, Everything But The Girl, Benny Golson, Jacqui Dankworth, Bob Dorough, John Martyn, Claire Martin, Eartha Kitt… Drums Sebastiaan de Krom Credits include Herbie Hancock, John Scofield, Phil Woods, Dave Holland, Jamie Cullum, Guy Barker, Wynton Marsalis, Clark Terry, Tim Garland’s Big Band…
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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.