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
Google Flow Music
Step into the studio with Google Flow Music
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
18 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 included18 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 Google Flow 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.
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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 capabilities with downloadable playlists.
Assumption to check: Limited offline functionality for music playback
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and enhance visual hierarchy.
Assumption to check: User interface may feel cluttered
Validate with people who use this workflow before building.
Hypothesis 3
Enhance algorithm for personalized recommendations based on user preferences.
Assumption to check: Low discovery of new music
Validate with people who use this workflow before building.
Hypothesis 4
Streamline the subscription management and provide clearer descriptions of benefits.
Assumption to check: In-app purchase process is confusing
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
Step into the studio with Google Flow Music Google Flow Music puts the frontier AI music models of Google at your fingertips. Whether you're writing your first melody or inventing an entirely new genre, Google Flow Music is here to put you in the flow state. START WITH A PROMPT Experience truly agentic music creation. Instead of turning knobs or plotting notes on a piano roll, you "produce" by chatting with a Gemini-powered agent. Start with lyrics or a simple instrumental track. Just ask your Producer to "make the bass punchier," or "sing lyrics in a deeper voice." HIGH-FIDELITY PRODUCTION With unmatched audio quality and deep creative controls, Google Flow Music enables deep, iterative refinement of your music. Seamlessly generate full length songs, remix your audio, and apply custom audio effects. MUSIC VIDEOS Direct your own music videos. Use the latest Veo video model to bring your sound to life directly alongside your track. You control the characters, aesthetics, and every detail. SHARE WHAT YOU MAKE Create playlists, publish your songs, follow your favorite artists, and discover new music every day. Google Flow Music learns your aesthetic and gets better with you. The more you create, the more it understands your personal sound. What will you create today? Terms of Use: https://policies.google.com/terms Privacy Policy: https://policies.google.com/privacy Privacy Notice: https://www.flowmusic.app/privacynotice
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.
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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.
