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.
Create professional quality Jazz tracks to your own chords in minutes with Volume 1 of the award-winning SessionBand Jazz app - the world’s only chord-based loop app.
$8.99 · 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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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 SessionBand Jazz 1: 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 loop selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Basic audio editing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Steep learning curve for beginners
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline capabilities
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.
Create professional quality Jazz tracks to your own chords in minutes with Volume 1 of the award-winning SessionBand Jazz app - the world’s only chord-based loop app. It's the ultimate Jazz play-along and the perfect tool for Jazz songwriters – wherever you are and whatever your level of ability. Jamie Cullum: "An extraordinarily useful tool for jazz musicians of any ability" James Tormé: “ Ridiculously useful. They seriously nailed it" With over 16,000 precision-cut, chord-based Jazz loops (included in the download) performed and produced for SessionBand by 4 of the world's leading jazz musicians, SessionBand Jazz instantly converts the chords you select into great-sounding Jazz audio - wherever you are and whatever your ability. Volume 1 comprises 15 diverse Jazz styles from Slow Swing, Medium Swing, Bossa Nova and Afro Jazz to Fast Latin, Up Swing and many more. And with a host of pro features like automated mixing, auto-transpose, one-touch live recording, real-time tempo shift and Audiobus compatibility, it has never been easier or quicker to create your own studio quality Jazz - even if you can't play a note! SessionBand Jazz Volume 1 is a professional app - essential for anyone learning Jazz and perfect for Jazz musicians looking for the ultimate play-along. But equally, it's simple and quick enough for non-musicians who love jazz to create their own great-sounding, royalty-free music and share it with the world. SessionBand Jazz Volume 1 has reached Top 5 in the paid music app charts in no fewer than 59 countries since launch. Watch the video at sessionbandapp.com The fastest way to create studio-quality Jazz... • Simply pick one of 15 Jazz styles • Choose your chords • Stretch or shorten loops in seconds • Build up your track in minutes • Instantly hear your track across other different Jazz styles and tempos • Auto-transpose your entire track (not electronic pitch shift!) • Mix your track (manual or automated) • Adjust track tempo (+/- 15%) • Record direct to audio • Copy straight to other music apps (if you want to) • Share with the world! SessionBand gets 4 of the world's top Jazz musicians playing on your tracks... Drums – Ralph Salmins (Wynton Marsalis, Burt Bacharach, Elton John, Madonna, Robbie Williams, Quincy Jones...) Saxes / Flutes – Andy Panayi (Peter Erskine, Freddie Hubbard, Wynton Marsalis, Paul McCartney...) Bass - Geoff Gascoyne (Georgie Fame, Michel Legrand, Sting, Van Morrison...) Piano – Tom Cawley (Jack DeJohnette, Charlie Watts, Jane Monheit, Stacey Kent, Yaron Herman, Guy Barker, Peter Gabriel...) The ultimate mobile practice tool for Jazz students... • Practice with your very own world class Jazz quartet • Loop markers let you focus on specific sections • Mute/Solo instrument channels (manual and automated) • Transpose your whole track instantly But you don't have to be a musician to create seriously good Jazz tracks and release them royalty-free... • Simple, intuitive interface • Audition loops as you go • 'Track Builder' makes building a full track quick and easy • Intuitive mixing and record functions • Hugely educational Detailed Product Information • 15 diverse popular Jazz styles in tempo order: Ballad; 12/8; Slow Swing (2 feel); Slow Swing (4 feel); Medium Swing (2 feel); Medium Swing (4 feel); Bossa Nova; Shuffle; Medium 3 /4; Afro Jazz; Medium Up Swing (2 feel); Medium Up Swing (4 feel); Fast Latin; Up Swing (2 feel); Up Swing (4 feel) • Tempos from 60bpm to 220bpm • 10 chord variations for every root note in all 15 styles: maj7(9); maj7(#11); 7(13); 7(b9); 7(#5,#9); 7sus(13); m7(9); m7(b5); m(maj7); dim • The exclusive musical content in this app is not duplicated in any other SessionBand app • All loops are offered royalty-free and can be used freely in your own works
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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.