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.
Ribbons is an extraordinarily fun and expressive musical instrument
$3.99 · 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 Ribbons : Touch Instrument: 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 instrument selection compared to other music apps.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Can be challenging for beginners to navigate the recording features.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases for additional features can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Audio latency issues reported by some users.
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.
Ribbons is an extraordinarily fun and expressive musical instrument. Inspired by early electronic instruments such as the Ondes Martenot and the Theremin, Ribbons (formerly "Ondes") emulates the fluid playing style of those classic instruments with an interface and synthesis engine firmly grounded in the present day. Whether you’re gliding through melodies & chord changes or creating dense polyphonic sci-fi soundscapes, Ribbons is an instrument unlike any you’ve played before. • 2014 Best iOS Instrument - Sonic Joy Awards • • 9.0 / 10 - Apptronica Magazine Review • Recommended for use with headphones or external speakers. Ribbons is made by Olympia Noise Co., developer of Patterning and Chordion. •••• Expressive Playing Surface •••• Slide freely between notes, Ribbons doesn’t limit you to the keys on a keyboard. Use 3D Touch on supported devices to control synthesis parameters. Adjustable note snapping for ultimate flexibility in playing style and ease of use. Use the hold function to sustain notes while you take an epic solo on top. Vertical movement can be mapped to volume and synthesizer parameters, adding dynamic possibilities to your music. More polyphony than you have fingers! Adjustable keyboard range and size. Guidelines help you play in key. Choose from common scale types in any key or create your own. Alternate tuning systems let you explore the world of microtonal sound! •••• Unique Synthesis Engine •••• Morphing wavetable oscillator with five wavetable sets. Swarm oscillators! Two extra oscillators can be detuned and lag behind to create new textures. Wavetable modulation sources include Y-Axis, sine wave, noise, circle, and ADSR envelope. Resonant low pass filter. Filter modulation sources include ADSR envelope, sine wave, and Y-axis. Amplifier section with master volume, Y-axis control, and ADSR envelope. Y-axis can be mapped to control the rate and depth of wavetable and filter LFOs. •••• Effects •••• Large selection of reverb types with adjustable amount. Delay effect adjustable level, feedback, time and filter. •••• MIDI •••• Use Ribbons as a MIDI controller to control your favorite software and hardware synths. Now supports MIDI Polyphonic Expression (MPE) output or use "classic mode" to manually managed MIDI ports. Map each touch to a unique MIDI Port/ Channel for polyphonic pitch bend. Because of Ribbons' unique pitch bend capabilities, it isn’t like other controllers, so make sure to read the instructions to learn about how to get the best results. •••• Inter-App Audio •••• Record directly to Garageband and other audio apps on your iPad using Inter-App Audio or Audiobus. Built-in Inter-App Audio transport allows you to control a host app’s play, record, and rewind buttons. Supports Audiobus State Saving. •••• Beautiful Design •••• Visualization of synthesis parameters makes for fun and intuitive editing of parameters. Clutter free screen lets you focus on making music. •••• Built-in Manual makes it easy to dig in and learn about Ribbons’ features.
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.