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.
The DJ Kartier app puts 1,000+ iconic sounds at your fingertips - famous leads, pianos, synths, brass, and drums inspired by chart-topping hits - all playable right on your phone or with the Kartier Piano MIDI Keyboard
Free · 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 DJ Kartier: 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.
The DJ Kartier app puts 1,000+ iconic sounds at your fingertips - famous leads, pianos, synths, brass, and drums inspired by chart-topping hits - all playable right on your phone or with the Kartier Piano MIDI Keyboard Browse by artist, song, or instrument, tap a sound, and play it on a full-screen piano. Every preset is sound-designed accurately, with pro controls so you can make it your own. WHAT YOU CAN DO • Play 1,000+ iconic sounds across genres • Make full songs with Kartier Studio • Post your songs to Creations and share them anywhere • Team up with friends in Crews: chat, play games, and climb the leaderboard together • Learn piano with interactive lessons • Play games, climb the leaderboards, and level up to new ranks • Use the built-in multi-touch piano • Connect your Kartier Piano via bluetooth for full playability • Watch animated video tutorials for hundreds of presets • Control your Kartier Piano's RGB key lighting - rainbow, custom colors, scale guide, and more MAKE SONGS WITH KARTIER STUDIO Build full songs and make your next hit. Layer your tracks, share, and collaborate. Easy and simple to start producing music! CREATIONS: YOUR MUSIC ON THE FEED Post your Kartier Studio songs to Creations, a feed of songs played as falling notes in your own note colors and background. Like, comment, follow your favorite players, and earn XP for posting. Download Creations as videos in Standard, HD, or HD Smooth and share them anywhere. Creations is for players 13 and up. CREWS: SQUAD UP Start a crew with your friends, chat, share your music, and challenge each other to Balls Battle, chess, checkers, cup pong, or pool right in the chat. Send animated stickers and emotes, give your crew its own look, and grow it as you rank up. YOUR KARTIER PROFILE Sign in to keep your lessons, XP, and Phonk Simulator progress on any device, show off your Creations, and claim a name that's yours alone. LEARN TO PLAY WITH INTERACTIVE PIANO LESSONS Follow falling notes across scales, chords, and classic melodies - from Ode to Joy to Canon in D - on your on-screen piano or a connected keyboard. Work through a step-by-step piano course, play chords with more than one finger, and get real-time Perfect/Good/Miss feedback and an accuracy score as you play. Turn any MIDI file or Creation into your own Custom Lesson for free. Start with free lessons, or unlock the full library with Premium. SAFE BY DESIGN Every message, title, and comment is filtered, anything can be reported, and players under 13 get a private mode with Parent controls. PREMIUM • Monthly, annual (save 50%), or one-time lifetime • Unlocks every sound and every lesson, with new sounds added regularly • Premium backgrounds, stickers, and crews MADE BY PRODUCER SUPPLY DJ Kartier is the mobile companion to the Kartier Piano - the fastest way to play the sounds you love, whether you're producing, beatmaking, or just jamming. — All sounds are original recordings inspired by various musical styles. Any artist or song references are descriptive only; no affiliation or endorsement is implied. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the period. Manage or cancel anytime in your App Store account settings. Privacy Policy: https://producersupply.com/pages/dj-kartier-app-privacy-policy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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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 sample library compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of social features for sharing mixes.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface can be cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent audio playback quality.
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.
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.