LUVLANG.STUDIO

Free LUFS check.
See exactly what streaming will do to your master.

Drop your track. Get integrated LUFS, true peak, and loudness range — measured by the same BS.1770-4 engine streaming services use. Then we tell you what gain reduction Spotify, Apple Music, and 8 other platforms will apply at playback.

Check My Master What gets measured

No signup. No card. Runs in your browser — your file never leaves your device.

Drop your track here — or tap to choose
WAV · MP3 · FLAC · AAC · OGG  ·  analyzed in your browser, nothing uploaded

What you get

Loudness
Integrated LUFS
Average loudness across the full track per ITU-R BS.1770-4 — the standard streaming services use to normalize playback.
Peak Detection
True Peak (4× sinc)
Inter-sample peaks captured with 4× polyphase sinc upsampling. Catches clipping that sample peaks miss.
Dynamics
Loudness Range (LRA)
How much your master "breathes" between quiet and loud sections. Tells you if over-limiting flattened your dynamics.
Spectrum
Frequency Profile
Bass / midrange / treble balance with rolling-band analysis. Spots low-mid mud and harsh top before it kills translation.

Compared against 10 streaming targets

Spotify−14 LUFS
Apple Music−16 LUFS
Tidal−14 LUFS
YouTube Music−14 LUFS
Amazon Music HD−14 LUFS
SoundCloud−14 LUFS
Bandcampno normalization
Beatport (DJ)−9 to −11
Vinyl−15 to −18
Podcast−16 to −19

Want a written report instead of just numbers?

Run the check above first, then leave your email — we'll send a report with your track's LUFS / true-peak numbers, how they land on every platform, and 3 specific things to look at. No spam, unsubscribe anytime.

Common questions

What does the free check measure?
Integrated LUFS, true peak (inter-sample), loudness range (LRA), and frequency profile. Then we tell you what gain reduction each streaming platform will apply.
Do I need to sign up?
No. The check itself is free, no account required. Email is optional — only if you want a written PDF report.
What file formats work?
WAV, MP3, FLAC, AAC, OGG. Up to 100 MB. We process in your browser when possible — your file never sits on our servers longer than the analysis takes.
How accurate is it?
Same BS.1770-4 algorithm streaming services use, with 4× polyphase sinc true-peak detection. The analyzer is the same one driving our paid mastering chain — no watered-down free tier.
What if my master isn't hitting the target?
The free check tells you the gap. If you want to fix it, our 24-stage mastering chain at /app targets the exact LUFS your distributor expects. Free A/B preview before you pay anything.