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.
It's broken
$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 Dark Park - Cinematic Synth: 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 sound editing capabilities compared to professional DAWs
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Steep learning curve for beginners
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Performance issues on older devices
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited social sharing options
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.
It's broken. Dusty. Hazy. But from those imperfections, something beautiful emerges. Dark Park is a generator of cinematic pads and drones, sounds that feel like they're decaying, collapsing, breathing. It's designed for exploration and instant inspiration. When you enter the park, you're given a navigation device. Tap "Scan", and the world beneath the surface generates a new synth patch. Every result is guided by musical constraints, so even the broken ones remain beautiful. If you find a sound you like, you can save it as a preset. There are two paths through the park. Take the Clear Path for delicate, melancholic textures. Or wander down the Obscured Path, and discover sounds that ache. The interface gives you a curated set of controls: Fog. Halation. Sodium. Spray. Pressure. And of course, the familiar ADSR controls to shape the sound further. Play Dark Park as a standalone instrument, or combine it with your favourite effects to create dark ambient music or arthouse cinematic scores. Feature list: - Cinematic synth engine designed for dark ambient, tension beds, drones, pads and atmospheric scoring. - Instant scene generation for fast discovery of new sounds. - Carefully voiced macro controls for shaping mood, depth, motion and character. - Fog control for darker or clearer overall tone shaping. - Halation and Sodium controls for analogue glow, slow evolution and atmosphere. - Spray and Pressure controls for texture and low-end weight. - Full ADSR envelope control. - Hold mode for sustaining evolving drones hands-free. - Built-in on-screen keyboard with octave shifting. - Scene browser for loading, saving and managing custom scenes (presets). - AUv3 support for use inside iPhone and iPad hosts. - Also compatible with Mac devices and supporting DAWs. - Standalone app for direct play without a host. - Designed to produce inspiring sounds quickly without menu diving. Important Information: • Device Layouts The standalone iPhone version and iPhone AUv3 versions are fully optimised for the iPhone screen. The iPad standalone app, desktop version, and AUv3 plugin use a fixed 1:1 interface layout. • Focused Sound Design Dark Park is intentionally designed with a specific sonic identity: cinematic, dark ambient pads and drones. It is not a general-purpose synthesiser and does not aim to recreate every type of synth sound. • Instrument Philosophy Think of Dark Park as a dedicated hardware instrument or soundbox. It excels within its intended palette rather than covering all synthesis styles. • Effects & Processing Dark Park contains no built-in effects. For best results, especially within ambient genres, use external processing such as reverb and delay.
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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.