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
Simply Guitar - Learn Guitar
Learn to play the guitar at your own pace with step-by-step tutorials, made by world-class music teachers, and receive feedback from the app while you learn to play your favorite songs!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
400,938 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 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 Simply Guitar - Learn Guitar: map the core Education 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
Learn to play the guitar at your own pace with step-by-step tutorials, made by world-class music teachers, and receive feedback from the app while you learn to play your favorite songs! No experience needed | For all ages | Works with any guitar --- Make your musical dreams come true --- • Play chords & songs straight away! • Learn step by step with high-quality video lessons • Receive feedback from the app and know when you are playing correctly or need guidance • Learn all the necessary techniques to play the songs you love: - Guitar fundamentals - Read and play tabs - Playing chords - Chord switching - Strumming techniques - Invaluable tips and tricks for playing correctly - Technique boosting exercises • Track your progress • Learn to tune your guitar (professional tuner included!) • Receive fast support from our musicians • Have fun and quickly improve your skills --- How Simply Guitar works --- • Place your device (iPhone) in front of you and play; the app will immediately recognize what you are playing • Get feedback on your playing to quickly learn and improve your guitar skills • Discover the magic of music with fun songs and complete lessons to start sounding like a pro • New songs and lessons are added regularly. --- Good to know --- Simply Guitar is developed by JoyTunes, creators of award-winning apps Simply Piano and Piano Maestro. JoyTunes are experts in creating educational and fun music apps for learning to play quickly and easily. Recommended and used by tens of thousands of music teachers worldwide with over 1 million songs learned every week. Awards & Recognition: - “Editors' Choice” by Apple - SF Music Tech Summit Startup Innovators Challenge Winner - Best Tool for Beginners, NAMM - EMI Innovation Challenge Award --- Contact --- Keep your feedback coming! Get in touch with us through the in-app chat and one of our friendly bunch will get back to you. Enjoy playing! Privacy policy: http://www.hellosimply.com/legal/privacy Terms of use: http://www.hellosimply.com/legal/terms
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 more interactive feedback mechanisms during practice.
Assumption to check: Limited feedback on user performance.
Validate with people who use this workflow before building.
Hypothesis 2
Implement AI to suggest lessons based on user progress and preferences.
Assumption to check: Lack of personalized learning paths.
Validate with people who use this workflow before building.
Hypothesis 3
Offer more flexible payment options or trial periods.
Assumption to check: Subscription model may deter casual learners.
Validate with people who use this workflow before building.
Hypothesis 4
Gamify learning with rewards and challenges to maintain user interest.
Assumption to check: User engagement drops after initial lessons.
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.
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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.
