What is Chord Auto α?
Chord Auto α is a web service that automatically generates guitar chord charts from video URLs on YouTube and other platforms using AI. Simply paste a URL and it will detect the chord progression and timing in real time.
Who is it for?
- Anyone who wants to quickly find the chords of a song on YouTube
- Players who struggle with transcribing by ear
- Guitar players of all levels — from beginners to advanced
- Those wanting to play songs for which sheet music is hard to find
- Musicians who need a quick chord reference before band practice
Key Features
AI Chord Analysis
High-accuracy analysis combining machine learning models (ChordMini · BasicPitch) with xAI Grok detects chord progressions in real time. Results are saved to the cloud database, so repeat lookups are instant.
Edit & Save Chord Sheets
Chord sheets can be freely edited and saved after analysis — correct chords, adjust timing, and record your own arrangements (Google sign-in required).
YouTube Player Sync
Results sync with the YouTube player, highlighting chords in real time as the song plays. Practice along while visually tracking each chord.
Capo & Transpose
Set a capo position or transpose the key up/down by semitone. Use the "Easy Key" button to automatically shift to a more guitar-friendly key.
Bookmarks & Playlists
Bookmark favorite songs and organize them into playlists for quick access (Google sign-in required).
Supported Services
| Service | URL |
| YouTube | youtube.com / youtu.be |
| Niconico | nicovideo.jp |
| SoundCloud | soundcloud.com |
| Bilibili | bilibili.com |
| Bandcamp | *.bandcamp.com |
| Vimeo | vimeo.com |
How to Use
- Paste a URL from a supported service (or search by song title) in the form on the top page
- Agree to the Terms of Service and Privacy Policy, then click "Generate Chord Sheet"
- Wait for the AI analysis to complete (usually 1–3 minutes)
- View the generated chord sheet and use it for playing
Pricing & Limits
Chord Auto α is completely free to use. Guest users have a daily limit on the number of analyses. Sign in with Google for unlimited analysis.
About
Chord Auto α is developed and operated by PXR LLC. For bug reports or feature requests, feel free to reach out on X (Twitter) @platoronical.