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
Music Downloader / MP3 Player
Best FREE music player, video player, and downloader
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.3
28,401 ratings · Top 30%
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 included17 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 Music Downloader / MP3 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.
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
Offer a more balanced free tier with essential features without constant prompts.
Assumption to check: Limited free features, often push for premium subscriptions
Validate with people who use this workflow before building.
Hypothesis 2
Implement better audio processing and optimization for a smoother playback experience.
Assumption to check: Inconsistent audio quality during playback
Validate with people who use this workflow before building.
Hypothesis 3
Streamline the interface to focus on essential features and enhance user experience.
Assumption to check: Cluttered user interface with too many options
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear documentation and support for users to troubleshoot issues.
Assumption to check: Some features may be buggy or poorly documented
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
Best FREE music player, video player, and downloader. Smart online music player. ALL FREE! The most feature-rich music player with unique features: nearby music recognition, movies, picture in picture, AI recommendations, and much more. Enjoy music with a stunning dark theme. Hundreds of millions of users choose our music apps! it’s a top 10 music app in over 100 countries. Join our 200M+ music family - download now! Stream online music or movies to save device space! Download over 30 million MP3 songs fast and play offline music anytime with equalizer, lyrics, bass boost, themes. Listen to offline music & video, podcasts, FM Radio, even when the screen is off. Watch unlimited free movies & TV shows of any genre: Comedy, Action, Fantasy, Adventure, Horror, and more in any language! The application provides streaming for non-commercial use only. All music content is legal. Note: This app is not a YouTube music downloader. YouTube music can be streamed but not downloaded. • Unlimited free music for unlimited time! All the app features are free forever! No limited skips, no accounts/subscriptions needed, no purchases at all! • Find any song! Stream over 300 million free songs from YouTube. • Picture in picture mode for multitasking: floating popup player with an ability to change the size and many other options. • Listen to other users' playlists or import your own playlists from YouTube. • Smart search: search any songs, artists, albums, artists, singles, covers, remixes, and more. • Powerful 10 band equalizer with presets - enjoy your music in your way! • Variable speed playback and BlueTooth headset controls. • Battery saver with reduced brightness and taps protection. • Music playing nearby recognition - discover new tracks on the go! Tap the mic button, and the app will identify music playing nearby and build playlists with similar songs. • Unlimited free movies & TV shows. Tens of thousands of movies of any genre: Comedy, Action, Fantasy, Adventure, Horror, and more in any language! • YouTube playlists import. • All music player controls: repeats, shuffle, and more. • Intelligent recommendations for featured music. • Daily updated top charts and trending music playlists. • Non-stop playback station mode based on smart AI recommendations. • Create and manage your favorite playlists with any content: online, podcasts, etc. • Share your music and playlists with your friends! • Tons of different genres, moods, and other music categories: Hip-Hop, Reggaeton, Pop, Rock, Classical, Jazz, RnB, Urban, Dubstep, Drum, Electronic, etc. • Rich audio and video lossless music format support: FLAC, ALAC, OPUS, MP3, AAC, OGG, M4A, WAV, AIFF, M4R, WMA, MP4, MKV, and many others. • Import files over Wi-Fi and from the Files app • Cast to TV and other devices. • Sleep timer: fall asleep to your favorite music. Start your music, and then set the countdown timer. At the end of the countdown, the app softly stops your music. • Ad-Free option. Note: the app does not download YouTube videos and does not play YouTube in the background; use of the app is subject to your agreement with our Privacy Policy and Terms of Service: https://www.atplayer.com/privacy-policy.html This app is the best source of unlimited music. The app has over 300 million online music tracks for streaming and over 30 million high-quality MP3 songs for download. ALL FREE!
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
React Navigation
React Native Async Storage
expo-av
Axios
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.
