Observed arrival · 2026-10-06

Thumbline turns a song into an accompaniment, not a transcription

thumbline.app Visit website

Editorial interest 78/100 Selection signal · not a rating of the site

A browser-based tool that turns an audio clip into a playable right-hand guitar part in arpeggio, fingerstyle, or flamenco styles.

Landing page captured for the 2026-10-06 issue.

For: Guitarists arranging songs from audio clips
Worth noticing: It distinguishes its output from transcription: the tool creates an accompaniment and lets users check uncertain chords.

Field notes

The input controls accept MP3, WAV, or M4A clips up to eight minutes, and a sample clip is offered. Each arrangement style has Basic, Moderate, and Advanced settings; playback can be slowed to 50% or 75% without changing pitch, and bars can be looped. The page identifies the project as free and AGPL-3.0 licensed, with no account required.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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