Chrome extension · for readers

Nocterna Whatever you're reading, a soundtrack that matches it.

Nocterna reads the page you're on and plays instrumental music, written and played by real people, that fits its mood.

Free for Chrome. No account needed to start.

01 / Read You open a page. An article, a story, a doc. Anything you read.
02 / Click Nocterna plugs in. One click. It reads this tab only.
03 / Score The words come loose… A small AI model scores eight moods.
04 / Play …and become the place they describe. Music that fits starts playing.

Product demo · 1:28

See it on a real page.

A web serial, a siege, a vigil and a fair. One click on each, and the music changes and the deck re-inks to match. Then close the popup: the music keeps playing.

Also on YouTube

Watch the demo 1:28

The library

Played by people. Never generated.

Every track on the shelf was composed and recorded by a human musician and released under a Creative Commons license, free to share as long as the person who made it gets the credit. No AI-generated music, ever.

Pull a book off the shelf to see who made it.

How it matches

AI does the reading. People made the music.

When you click the Nocterna icon, it reads the visible text of that one tab. A small AI model scores the passage on eight moods: energy, brightness, tension, warmth, complexity, how acoustic it feels, how serious, and how much it flows.

Every track in the library was scored on the same eight by a person who listened to it. Nocterna plays the closest matches, and the music keeps going while you read.

Your page text is used to pick the music, then thrown away. It is never stored or logged.

Try it: pick a page

Example scores. Each page re-inks this whole site, the way it re-inks the popup.

Give your next page a soundtrack.

Add to Chrome Watch the demo (1:28)