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.
Feel the power of music.
$9.99 · 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 KaiserTone Audio Player +HiRes: 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 music discovery features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High price point for premium features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of customization options for UI
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.
Feel the power of music. KaiserTone contains the "Amazing Quality Sound Engine AQS-XI”. This high-speed sound engine makes use of over 64000 frequency bands to deliver the very highest quality audio. Sound Engine AQS-XI provides an equalizer, virtual surround, cross fader, gapless playback, silence detection, noise reduction, and a dynamic limiter, to allow you to listen to your favorite music at your preferred sound quality. KaiserTone plays music files stored on the iTunes library and in the high-resolution music database (HiRes DB). Supports High-resolution sources: 1) playback of high-res sources up to 768kHz/32bits 2) PCM and DoP (DSD over PCM) playback of high-res DSD files up to 12MHz/1bit. Supported audio format: - iPod Library(iTunes): audio format used by Music App of Apple - Hires DB: DSD(2.8MHz~12MHz/1bit, .dsf, .dff), FLAC(8k~384kHz/8~32bit), WAV(8k~768kHz/8~64bit), Apple Lossless(8k~384kHz), AIFF(8k~768kHz/8~32bit), AAC(8~320 Kbps), MP3(8~320 Kbps), MP4(as Sound), M4V(as Sound) * In iPod Library, Music app exclusive data (Apple Music, DRM, iCloud) can be cooperative played back with the restriction function by Music app. Compatible models: iPhone 5 or later, iPod touch 7, 6, iPad Pro, Air2, Air Playback Options: - 6 modes of continuous playback (+ Medley) - Music shuffle - Spectrum analyzer (stereo split, bandwidth resolution, persistence, etc.) - Speaker, headphones, Bluetooth, AirPlay, dock - SNS posting (iOS11/later, Twitter, facebook, ...) - Sleep Timer from 10 min. up to 8 hr. Sound Quality Effect: - Presets equalizer: Normal, Perfect, Eargasm Explosion, Rock, Rap, Metal, Country, Jazz, Acoustic, Classic, Blues, Oldies, Reggae, Opera, Speech, Bass, Mid, Treble - Graphic equalizer:(5 Band, 10 Band, 20 Band, 30 Band, Spline curve 16k, 32k) Range: -12dB ~ +12dB. (Minimum Step: 0.1, 0.5, 1.0dB) Six types of equalizers for your enjoyment: ○ Beginner: 5 Frequency bands: 100Hz-8KHz ○ Average: 10 bands: 32Hz-16KHz ○ Expert: 20 bands: 32Hz-22.62KHz ○ Master: 30 bands: 25Hz-6.3KHz ○ Spline Curve: Customizable frequency band range 16k: 32Hz-16KHz, 32k: 16Hz-32KHz - Virtual surround sound presets - Digital Output (Max 768kHz/32bit) - DoP output v1.0/v1.1 - "Prevent the head cutting" for DAC (0 to 3.0 sec.) - Up-sampling with integral multiples settings Volume control: - Fine volume - Left/Right balance - Gain adjustments - stereo/monaural Music Selection - Playback music from the iTunes Library and the HiRes DB - by artists, albums, songs, genres, playlists(Create/Delete), Compilations, Composers, SampleRates, Formats - "Shuffle" play can be selected from the song list - "All songs" has the top of the artist/album - Songs can be searched from the artist, album, song lists - “Album artist” settings - Grid View (on iPhone5/more) - Mini Player - Add to queue Settings - Customize the design with 24 different colors - Silence detection (Automatically skip silences lasting 3 or more consecutive sec.) - Automatic dynamic limiter, noise reduction - Spectrum analyzer (stereo, bandwidth, color...) - Crossfade (0 to 20 sec.) - Pause Fadeout (0 to 1.0 sec.) - Album art view swipe action settings - Player orientation settings - Edit the music selection tags Other - 7 Virtual surround sound presets (live Reverb) - Control playback with headphone buttons and Bluetooth - Output with speakers, headphones, Bluetooth, AirPlay, docks - Album art display - Gapless playback - Auto pause on unplugging headphones / receiving a phone call - Background playback - Display lyrics when included in the song file - importation to the HirRes DB by iTunes and AirDrop, by Files app on iOS11 or later Notes : * In Hires DB, it cannot play a track with compression dff file / DRM protected file. * Only Playlist created in this app can be deleted * The download button of purchased sound source from mora is displayed only for "language:Japanese or region:Japan". mora's service is only available in Japan
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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.