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
Glazba – Music Player
Listen music from your favourite cloud storage service (Google Drive, Dropbox, OneDrive, Yandex.Disk), download tracks for offline access.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
117 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.
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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 included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Glazba – Music 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.
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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
Implement robust offline caching and download management.
Assumption to check: Limited offline capabilities for music playback
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing options for users to share songs and playlists.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Include synchronized lyrics display for a more engaging experience.
Assumption to check: No lyrics synchronization during playback
Validate with people who use this workflow before building.
Hypothesis 4
Design a cleaner, more minimalistic interface for easier navigation.
Assumption to check: User interface can feel cluttered
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
Listen music from your favourite cloud storage service (Google Drive, Dropbox, OneDrive, Yandex.Disk), download tracks for offline access. Or upload music from PC/Mac directly using WiFi or cable. Main feature is the playlist, where you can drop music with a simple gesture. It really feels that easy: you can quickly made a playlist you need right now out of hundreds of tracks you have. All the tracks in this playlist will be nicely separated by albums or folders. Folders. You can upload music from your PC/Mac straight into the player app. All your highly structured music collection… or just a jumble of tracks. Upload entire “E:\music” folder and it will appear as is in the application (look below for instructions). If you used to sync with iTunes or have an Apple Music subscription, it is supported as well. The rest: - Real waveform instead of boring position slider. - Covers for albums. - Last.fm scrobbling. - Support for FLAC, radio-streams and many more audio formats. Enjoy! ————— How to upload music from PC/Mac: Method #1. - Connect your iPhone/iPad. - Launch iTunes. - Go to Apps and scroll down to File Sharing. - Find “Glazba”. - Drag and drop any files or folders with music into Glazba Documents. Method #2. - Check that you iPhone and computer are connected to the same WiFi. - Enable WiFi Upload in the app (Folders -> WiFi Upload). - In the browser on computer go to specified URL (something like http://192.168.1.140). - Create/rename/delete folders and drag and drop music files directly into browser page.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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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
Zustand
expo-av
BUILD KIT DIFFICULTY
Advanced
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.
