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.
Built natively for Apple Silicon
$4.99 · 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.
Your first Build Kit is free with a verified email.
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 Octopus | Hi-Fi Music Player: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Built natively for Apple Silicon. No middleware. No streaming. No accounts. No compromises. Bring your own library; let the hardware do what it always could. Zero ads. Zero subscriptions. Zero logins. Zero in-app purchases. Pay once. Own it forever. FOR EVERYONE Play every format that matters. Octopus scans and organises your library instantly, however large or chaotic. Lossless: FLAC, ALAC, WAV, AIFF and more. Lossy: AAC, MP3, M4A and more. FOR THE ARCHIVIST Browse your library by its real on-disk folder structure — drill into subfolders, play anything, and send a single file or a whole folder to the queue or a playlist. FOR THE PURIST Your tracks, exactly as mastered. A bare-metal DSP engine and true bypass signal path deliver absolute integrity, file to ear. Nothing added, nothing taken away. Gapless playback keeps albums and sets seamless. Feeding a USB DAC? True bypass hands it the clean signal straight off the file. FOR THE PERFECTIONIST Sculpt your soundstage with a battle-style 3-band EQ — pure native DSP, full frequency control, zero latency. FOR THE BOLD Two studio-grade FX engines, live on the signal path: Rave FX — A tribute to French House. Legacy-grade compression, room presence, massive punch. Punk FX — Raw, driven, and unforgiving. Built for the records that were never meant to be polished. FOR THE EXPLORER A genre intelligence engine runs entirely on-device — no internet, ever. Every track is auto-classified by a three-tier engine — metadata, a curated alias map, and a hand-built artist dictionary thousands of entries deep. A library that organises itself. FOR THE SEEKER Meet the Artist Discovery Agent — a completely offline, hand-curated catalogue. Surf genres and sub-genres. As tracks play, it surfaces recommendations in the same style. Zero APIs. Zero server pings. Pure discovery. FOR THE CURATOR Build playlists the way you think about music. Drag, reorder, add whole albums or genres in one move. Stored locally, instantly offline. FOR THE NOMAD A native C++ crossfeed kernel — the classic Bauer/Chu Moy topology — recreates the interaural delay and head-shadow your ears expect — studio monitors inside your headphones. FOR THE EXPERIENCE Feel the hardware. An interface rooted in industrial design — Nixie tubes, hardware-calibrated VU meters, a mechanical ticker, a custom cassette deck. An analogue soul wrapped in digital metal. WAVEFORM — Watch your tracks breathe through a high-frequency spatialized audiograph. FERROFLUID — A live-rendering, turbo-fps GPU audio sculpture, forged in real time on bare metal. Your iPhone was always an audio rocket. This is the fuel. THE HARDWARE ECOSYSTEM An iPhone-first powerhouse that extends across your entire Apple grid. Apple Watch: Your wrist is the remote. Leave the iPhone at the amp — browse playlists, run your queue, drive the engine — live waveform and all. Watch Complications: Build a gorgeous music-lover's watch face — now-playing complications in every shape, track and live progress on the dial. CarPlay: The ultimate road-trip interface — full, unrestricted access to your entire offline library on your dash. Siri & Shortcuts: Run the rig by voice — "Play Daft Punk on Octopus," "Play some techno on Octopus." The engine knobs — EQ, Rave, Punk, volume — live as Shortcuts actions, ready for your automations. iPadOS & macOS: No stretched-out ports — a dedicated studio console for the big screen, native on Apple Silicon Macs. Home Screen & Lock Screen Widgets: Hijack your glass with high-contrast, always-on widgets — living audiograph, loudness meter, Fibonacci ribbon, now-playing in every size. Dynamic Island & Live Activities: A living waveform and transport controls in the Dynamic Island and on the Lock Screen — no app required. UNTHROTTLED VIDEO A hidden, fully unthrottled video engine on Apple's native foundation. Drop in MP4, MOV, or M4V — pure hardware-accelerated playback, same bare-metal philosophy as the audio.
Written user reviews are not shown here. Check current App Store reviews >
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 offline support and download options.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user interface design can lead to confusion.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social sharing features.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited search functionality and categorization.
Validate with people who use this workflow before building.
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.
Not assessed in a Build Kit yet.
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.