Fretlight is a guitar learning system brand from Optek Music Systems, founded in 1988 by Rusty Shaffer. The company is based in Reno, Nevada, and has built its identity around a single distinctive idea: embedding LEDs into the fretboard of an otherwise standard electric or acoustic guitar so that chords, scales, riffs, and full songs can light up directly under the player's fingers. The patented system is designed to shorten the gap between reading a diagram or watching a lesson and actually fingering the notes on the neck.

The lineup centers on the Fretlight Wireless electric guitars, including models such as the FG-621 and the Beginner Electric, along with a Traveler Guitar collaboration and acoustic variants. The hardware pairs with software including Guitar Pro integration and the Guitar Tunes app, which syncs lessons and song playback with the on-neck LEDs. Fretlight Classroom extends the same concept to group instruction, allowing an instructor's playing to be mirrored across many connected guitars at once.

Fretlight occupies a niche distinct from traditional guitar builders, positioning itself less as a tone-focused instrument maker and more as an educational technology company that happens to ship playable guitars. Its audience skews toward beginners, self-taught players, and music educators looking for a visual, hands-on alternative to tab books and standalone lesson apps.

Fretlight has 4 products cataloged on Equipboard, including Solid Body Electric Guitars. Their gear is featured by 1 artist, with the strongest followings in Rock. Notable users include Big Boss.