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
Strum - Play Guitar
Transform any song into playable chords in seconds! Whether you're jamming to YouTube hits, your personal music library, or chart-toppers, Strum makes learning your favorite songs effortless.*
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
20,100 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
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A product spec, screen plans, and build steps for your coding agent.
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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.
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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 Strum - Play Guitar: 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
Transform any song into playable chords in seconds! Whether you're jamming to YouTube hits, your personal music library, or chart-toppers, Strum makes learning your favorite songs effortless.* Key Features: YouTube Integration - Paste any YouTube music link and get instant chord progressions File Upload Support - Upload your own audio files (MP3, WAV, M4A) for chord detection Top Charts Library - Browse trending songs with pre-loaded chord charts Top Quality Chords - Advanced in-house algorithm analyzes audio to identify accurate chord progressions Practice Mode - Loop sections and adjust playback speed for learning Perfect For: Beginner musicians learning new songs Experienced players wanting quick chord references Music teachers creating lesson materials Songwriters analyzing chord progressions Anyone who loves playing music Stop searching for unreliable chord tabs online. Get accurate, professionally formatted chord charts for any song in your music collection. From classic rock to today's pop hits, Strum has you covered. Download now and start playing your favorite songs today! Terms of Service: https://www.strumguitarapp.com/terms CUSTOMER SUPPORT: Your experience is our number one priority! If you have any questions or concerns, please reach out to [email protected] and we will get back to you as fast as possible! **Access to all features requires a paid subscription to Strum Unlimited. Additional information can be found on the in-app paywall.**
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
Enhance song offerings through user submissions or partnerships.
Assumption to check: Limited song library compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement adaptive streaming based on user bandwidth.
Assumption to check: Inconsistent video quality
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the navigation flow with clearer labels and icons.
Assumption to check: Navigation can be unintuitive
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social sharing and community feedback options.
Assumption to check: Lack of social features
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
React Native
Expo
Supabase
Axios
react-navigation
react-native-video
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.
