Lento: Slow, Reverb, Bass Boost

by uboa · Entertainment

Manifest V3 Free

View in Chrome Web Store Data as of 15 Oct 2026

A small, no-nonsense extension to add slow, reverb, and bass boost effects on most music-streaming sites.

Users

+55 in 30 days

Rating

5.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#92K

#77K among extensions

Version

2.0.1

updated 23 Aug 2026

Users

monthly, 2 months

Latest, 15 Oct 2026: 76 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 months

Latest, 15 Oct 2026: 2 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Lento: Slow, Reverb, Bass Boost

Head to a tab playing a music, choose your favorite preset (or dial in your own speed, reverb and bass boost), and sit back and enjoy! Lento supports most sites with audio or video. If it plays in a tab, Lento will probably catch it. Known limitations - Amazon Music: speed control only. Amazon DRM currently blocks the audio processing that the reverb and bass boost functionality require. This is a solo project, so issues will be addressed as time allows. Your patience is appreciated! Bugs and source code See a problem? Use the bug-report button right in the popup or file an issue on GitHub. Free, forever! Lento will always be free and open-source! You will never have to pay for features here. If you'd like to support my work anyway, check out my Ko-fi! Data disclaimer Lento will never transmit your data. All music processing is done locally on your machine, and nothing is ever sent to me or anyone else.