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
Chordify: Songs, Chords, Tuner
Chordify helps musicians of all levels to learn to play the music they love.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
33,941 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 Chordify: Songs, Chords, Tuner: 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
Chordify helps musicians of all levels to learn to play the music they love. Get started with Chordify right now and get immediate access to the following free features: - Accurate chords for any song - Curated content & personal library - Animated views for piano, ukulele and guitar chords - Seamless integration with YouTube - Search our 36,000,000 song catalog, and any other song in the world - Cross-platform library integration (desktop, mobile) How does Chordify work? Simply: 1. Search for any song you want to play. 2. Choose the instrument you want to play the song on. 3. Jam along with your favorite song! Subscribe to Chordify Premium and get access to the following extra features: - Easily transpose the chords if you want to play in a different key - Try the capo feature and play your chordified songs the easy way - Slow down songs to keep up - Loop tricky parts to jam like a pro - Download the chords from your favorite songs as MIDI file for easy audio editing - Take the calculated chords with you as a PDF printout, wherever you go. Everyone is a musician. Start playing. QUOTES “I'm using Chordify to learn new tunes for my Punk Rock Karaoke Band” - Greg Hetson, Guitarist - Bad Religion, The Circle Jerks, Punk Rock Karaoke “Chordify is incredible for studying music. Drop in a video and it works out the chords to play along.” - Oliver, user “Chordify is the greatest invention since someone thought to put milk in espresso. SERIOUSLY.” - Stephen, user ABOUT Chordify Chordify is an online music education tool, made by music lovers to help you to get chords for any song you want. Our service automatically recognizes the acordes and audio signal of a song and will synchronize this with your song in a simple and innovative music player. Chordify is an innovative business that will help starting musicians and advanced with playing the music they want to play. Twitter: https://twitter.com/Chordify Facebook: https://www.facebook.com/Chordify Privacy Policy: https://chordify.net/pages/privacy-policy/ Terms & Conditions: https://chordify.net/pages/terms-and-conditions/ Chordify Premium You can subscribe to Chordify Premium annually or monthly. If you choose to subscribe, you will be charged the access price according to your local store currency. The price will be shown in the App before you complete the payment. Annual and Monthly subscriptions auto-renew unless explicitly turned off at least 24 hours before the end of the current subscription period. Your iTunes account will automatically be charged within 24 hours prior to the end of the current period and you will be charged accordingly. You can turn off auto-renew at any time from your iTunes account settings. Download Chordify now and get chords for any song you want! Ready to play?
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
Offer more features in the free tier to attract users.
Assumption to check: Limited free features compared to paid subscription
Validate with people who use this workflow before building.
Hypothesis 2
Implement user-generated chord corrections and suggestions.
Assumption to check: Difficulties with chord accuracy
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to upload their own songs and chords.
Assumption to check: Limited song library
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation and improve UI layout.
Assumption to check: Cluttered interface
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
Zustand
React Navigation
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.
