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.
KaraFun brings karaoke, singing game Battle and music quizzes to your iPhone & iPad! Access a vast library of songs, sing your favorite tracks with friends, score your voice and add a fun twist to your sessions with e...
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 KaraFun: Karaoke, Battle, Quiz: 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.
KaraFun brings karaoke, singing game Battle and music quizzes to your iPhone & iPad! Access a vast library of songs, sing your favorite tracks with friends, score your voice and add a fun twist to your sessions with engaging music quizzes. Whether you’re belting out hits or testing your musical knowledge, the fun never stops! — Free — Enjoy access to a selection of free songs, one free quiz, and previews of premium tracks from our catalog. Try out all available features, and explore our apps on all your devices for a complete karaoke experience. — Premium — Unlock the full catalog of songs, karaoke and battle, music quiz, sync your favorites for offline use, create custom playlists, and personalize your experience by adjusting vocal volumes, key, and tempo to suit your style. — Pro — You get everything from the premium plan—full access to songs, music quiz, offline sync, custom playlists, and vocal adjustments—along with additional benefits tailored for businesses, such as a commercial license, a permanent QR code for seamless access, and advanced branding and party control features. — Features — - Sing: Experience the best in karaoke with uninterrupted, ad-free sessions, studio-quality sound, and access to a premium catalog of songs. Discover tracks shared by the community and even enjoy your favorite songs offline for the ultimate convenience. - Sing & Play with Battle: Enjoy our singing game to challenge your friends and score your voice thanks to real-time scoring. - Play with Quiz: Immerse yourself in the world of quizzes and challenge your friends to test your musical knowledge. With the interlude feature, enjoy short musical breaks that make each quiz even more dynamic and engaging. Every quiz provides a fresh and unique experience! - Control: Take full control of your karaoke experience with customizable key and tempo settings, adjustable instrumental and vocal tracks volumes, and the ability to personalize the singer’s name. Easily manage everything with remote control from your phone, and keep the party going with seamless background music. - Organize: Organize your perfect karaoke session by creating custom playlists, adding songs to your favorites, and enjoying automatic catalog updates. Effortlessly managed the song queue to keep the party flowing smoothly. - Vocal Match: Analyze your voice and match it against thousands of songs to find your perfect matches. Discover which tracks suit your unique vocal style! - Offline mode: Hosting a karaoke party in the boondocks? KaraFun's got you covered even when there's no internet. Sync your favorite songs and quizzes offline and keep the fun going! - Inputs: Enhance your setup with our user-friendly input system, allowing you to easily plug in microphones, enjoy simplified controls, efficiently manage inputs, and benefit from a space-saving design for a smoother, more consistent experience. - Cast to AirPlay / External Screen: Easily connect your device to any AirPlay-compatible system, or directly to a video projector or TV using an HDMI or USB-C cable. Enjoy the most compact yet powerful karaoke setup for guaranteed party success! Terms of Service: 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 song selection in the free tier
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface can feel cluttered
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inconsistent audio quality
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social features
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.