Meter any tab, instantly
Capture whatever's playing, from a private stream to a client preview, and read true LUFS without leaving the page.
Live meter · Free Chrome extension
Live LUFS, right in
your browser bar.
Read real-time integrated, momentary and short-term loudness, plus true peak and stereo correlation, on any audio playing in your browser. 100% free.
Works with
Chrome
Brave
Edge
Orion
5.0 on the Chrome Web Store ITU-R BS.1770 / EBU R128
Live LUFS by mastering.to
mastering.to
LIVE METER
INTEGRATED LUFS
-8.2
LUFS
on target
MOMENTARY
-8.3LUFS
SHORT-TERM
-8.1LUFS
MOMENTARY · LAST 20S
TRUE PEAK
0.2dBTP
CORRELATION
0.92
SOURCE
Metering: YouTube audio
Live preview · simulated signal
Meter anything that plays
If it makes sound in your browser, you can measure it.
Open the side panel on any tab and read true loudness in real time. A SoundCloud private link, a Bandcamp preview, a Beatport clip, a client's WeTransfer bounce, a YouTube reference. No fuss, no muss, just meters where you need them.
- Spotify
- Apple Music
- YouTube
- Tidal
- Deezer
- SoundCloud
- Beatport
- Bandcamp
- Amazon Music
- Qobuz
What you get
A full loudness suite in your browser.
Integrated, momentary & short-term
The full ITU-R BS.1770 / EBU R128 set. Watch integrated settle while momentary and short-term track the moment-to-moment energy of the mix.
Platform targets built in
Switch between Spotify, Apple Music, Tidal, Deezer, club and broadcast targets. Your over or under shows in LU at a glance.
True peak & correlation
Catch inter-sample peaks before lossy codecs clip them, and keep phase correlation in view so your low end stays mono-safe.
Live momentary trace
A rolling 20-second graph shows how loudness moves, so pumping, over-compression and quiet intros are obvious at a glance.
Private by design
Metering runs entirely on your machine. Nothing is uploaded, recorded or sent anywhere. The same browser-only philosophy as mastering.to.
Up and running in seconds
How it works
-
01
Add it to Chrome
Install from the Chrome Web Store in one click. It sits in your side panel, out of the way until you need it.
-
02
Open the panel on any tab
Play the audio you want to check, then open the Live LUFS side panel next to it.
-
03
Get levels
Numbers begin the moment audio plays. Get LUFS on the fly, from any source you need.
Reference
Reference targets, built in.
Check levels against platform targets at a glance.
DestinationIntegrated target
Spotify / YouTube / Amazon-14 LUFS
Apple Music-16 LUFS
Tidal-14 LUFS
Deezer-15 LUFS
Club / live PA-6 LUFS
Broadcast (EBU R128)-23 LUFS
Every number, explained
What the panel is telling you.
- Integrated LUFS
- The gated average loudness of everything metered so far. This is the figure streaming platforms normalize to.
- Momentary & short-term
- Loudness over a 400 ms and a 3-second window, so you can see how the mix breathes in the moment.
- True peak (dBTP)
- The real peak including inter-sample overshoots, measured with oversampling so nothing hides between samples.
- Stereo correlation
- How in-phase your left and right are. Positive is mono-safe, near or below zero warns of phase issues in the low end.
Private by default
Your audio never leaves the browser.
Live LUFS measures the audio locally, on your own machine. There is no upload, no recording, and no account. Nothing about what you play is stored or sent anywhere. The extension asks only for the permission it needs to read the tab you point it at.
Questions
Good to know
Is Live LUFS really free?
Yes. It's completely free on the Chrome Web Store. There's also no advertising and zero tracking. It's a companion to the full mastering.to analyzer.
Which browsers does it work in?
It installs from the Chrome Web Store and runs in Chrome and other Chromium browsers, including Microsoft Edge and Brave.
Does my audio get uploaded anywhere?
No. All metering happens on your own machine, inside the browser. Nothing is recorded, uploaded or sent to a server.
Why does it sometimes say it can't capture a tab?
If a tab is already streaming audio when you open the panel, Chrome can occasionally block the capture. Start metering before playback, or reload the tab and press start again, and it picks the audio straight up.
What loudness standard does it use?
The same ITU-R BS.1770 and EBU R128 algorithms as the full mastering.to analyzer, including gated integrated LUFS and true peak with oversampling.
How is it different from the mastering.to analyzer?
The extension is for live monitoring while you listen to any tab. The mastering.to analyzer is for deep analysis of a finished file you upload, with dozens of additional tools.
Put a loudness meter on every tab.
Free, private, and always one click away.