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.
App Overview
Endlesss - Multiplayer Music
Endlesss is a collaborative music studio with built in drums, synths, fx and much more
$29.99 · In-app purchases
PRICE
$29.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
456 ratings · Top 15%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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.
JavaScript is required to complete mailbox verification.
Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Endlesss - Multiplayer Music: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Include more robust audio editing tools and effects.
Assumption to check: Limited audio editing features compared to desktop DAWs.
Validate with people who use this workflow before building.
Hypothesis 2
Implement features to reduce latency and improve synchronization.
Assumption to check: Real-time collaboration may introduce latency issues.
Validate with people who use this workflow before building.
Hypothesis 3
Offer a free tier with limited features to attract more users.
Assumption to check: Subscription cost may deter casual users.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify onboarding and provide tutorials to enhance user experience.
Assumption to check: User interface can be overwhelming for new users.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Endlesss is a collaborative music studio with built in drums, synths, fx and much more. Easy to get started for the novice electronic musician with boundless opportunities for the seasoned creative. Quickly layer loops and beats to create ever evolving soundscapes. Intuitive workflow fine-tuned to keep you locked in the groove and express your musical creativity - alone or together with others. - Make amazing beats & music alone or together using a unique creative workflow - Dive into community jams or create your own jams and invite friends - Share your creations in the community and take part in weekly charts - Watch, listen and chat with featured artists and the Endlesss community - Easily share your creations with the world SIMPLE AND FUN TO PLAY - Simple, powerful pads, sounds and FX help you make pro-quality music instantly - Create, share and remix loops in seconds - build tracks worth of content in minutes - Play a growing library of sound packs & instruments GO DEEP QUICKLY - Remix your own and other people's loops with powerful DJ-style performance FX - Layer up vocals or real-world instruments using your mic - Creatively re-sample your own and others layers with the Sampler instrument CONNECT TO YOUR PRO WORKFLOW - Plug in external synths, guitars, vocal mics, drum machines or eurorack - Use AUv3 plugins and effects to add your favourite sounds - Use Ableton Link to sync up with other apps, DAWs and Link-enabled devices - Connect your midi controller for maximum expression FEATURES - 8-channel retrospective looper with intuitive interface for making loops of various sizes and optimised for speed and creativity - No limit on loops or jams created - create as much as you want alone or together with your friends - Multiple high quality synth, bass and drum packs to get you started - FX pack with 12 core effects such as reverb, delay, distortion and low/high-pass filters - Input from microphone or external instruments - AUv3 plugin support with macro mapping and preset saving - Extensive key / scale, tempo, time signature and quantisation settings - Connect to DAWs and Link-enabled devices - Export to movie or to stems for editing and processing outside Endlesss Terms of Service and Privacy Policy: https://endlesss.fm/terms
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
react-navigation
expo-av
@supabase/supabase-js
BUILD KIT DIFFICULTY
Expert
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.
