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
Audiomack - Play Music Offline
Discover Music & Playlists with Audiomack – Stream & Download Offline
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
2,026,535 ratings · Top 5%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included19 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.
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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 Audiomack - Play Music Offline: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Discover Music & Playlists with Audiomack – Stream & Download Offline Audiomack is a music player and discovery app that lets you stream and download the hottest songs, mixtapes, albums, and playlists. On the Audiomack free tier, listen and download songs and albums with no subscription needed. Play full songs and albums with unlimited skips and repeats, even in the background while using other apps. You can even make your own playlists, and stream and share them, all for free. Whether you're into hip-hop, Afrobeats, R&B, amapiano, Latin, reggae, dancehall, pop, rock, or country, Audiomack helps you discover music and rising artists faster than ever. Audiomack Free features: - Stream music with full control: Play full tracks with unlimited skips. Build playlists, repeat your favorite songs, and listen the way you want, free. - Listen offline, no wifi needed: Download music and mixtapes to your phone and play them anytime, even without data. - Remix your songs with Audiomod: Customize playback with pitch control, speed adjustment, reverb effects, and presets like Nightcore, Sped Up, Daycore, Slow and Reverb, and more. - Personalized Music Recommendations: Get new music picked just for you. - Top charts and trending music: Explore what’s hot locally and globally - see what’s trending on our top music charts. - Connect with artists: Follow your favorite artists and be the first to hear new releases and exclusive messages. Audiomack+ (monthly subscription) features: - No Ads: enjoy your music with no interruptions - Premium listening experience: equalizer, hifi listening - Premium mods: get access to more Audiomod presets Trending Artists on Audiomack: - YoungBoy Never Broke Again - Yeat - Post Malone - Rod Wave - Lil Durk - Drake - Burna Boy - Asake - Nicki Minaj - Bad Bunny - Peso Pluma Explore the future of music streaming and offline listening—download Audiomack today and start discovering your sound. Use of the Audiomack App and download feature is subject to your agreement with our Privacy Policy/TOS. Privacy Policy: http://www.audiomack.com/privacy-policy TOS: http://www.audiomack.com/about/terms-of-service Explore the future of music – download Audiomack now!
Written user reviews are not shown here. Check current App Store reviews >
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
Incorporate social sharing to platforms like Instagram and Twitter.
Assumption to check: Limited social sharing features
Validate with people who use this workflow before building.
Hypothesis 2
Offer an ad-free experience with subscription.
Assumption to check: Ads in free version can be disruptive
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the offline download process with clear prompts.
Assumption to check: Offline downloads can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Implement a cleaner design with better organization of content.
Assumption to check: User interface can feel cluttered
Validate with people who use this workflow before building.
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
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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.
