Mix Checker
Drop in your mixdown, and a reference track if you have one. See how loud it is, whether it clips, how its frequencies balance and whether the low end is mono, with plain advice on what to fix. Your audio never leaves your device.
What to look at
Loudness and peaks
EBU R128 / ITU-R BS.1770Frequency balance
Stereo
What the numbers mean
Integrated loudness (LUFS) is the average loudness of the whole track, measured the way streaming services and broadcasters measure it. Quiet passages below a threshold are ignored, so a long breakdown doesn't drag the number down. Club-focused trance masters commonly sit somewhere around −9 to −6 LUFS; streaming services turn anything louder than about −14 LUFS down to match.
True peak (dBTP) estimates the highest point the waveform reaches between samples, which is where clipping happens when a file is converted to MP3 or AAC. Keeping it at or below −1 dBTP leaves room for that.
Loudness range (LU) shows how much the loudness moves between sections. Trance with big breakdowns usually reads higher than a flat, wall-to-wall track. PLR, the gap between the true peak and the integrated loudness, is a rough measure of how much punch the limiter has left.
Frequency balance averages the spectrum over the loud parts of the track. With a reference loaded, the reference is matched in loudness first, so you're comparing tone, not level. Differences of a decibel or two are normal; three or more in one band is worth a listen.
Stereo. Correlation near +1 means mostly mono, near 0 very wide, and below 0 means parts of the mix may cancel on a mono club system. Below about 120 Hz, the kick and sub should be close to mono: wide low end loses power in mono and makes vinyl and big systems struggle.
Questions
Is my audio uploaded anywhere?
No. The file is decoded and measured inside your browser, and nothing is sent or stored.
How accurate is the loudness reading?
It follows the BS.1770 method (K-weighting, 400 ms blocks and gating) and should match a dedicated meter to within a few tenths of a dB. True peak is estimated by oversampling the loudest parts of the track four times.
Should I master to −14 LUFS for Spotify?
You don't have to. Spotify, YouTube and Apple Music turn loud tracks down, so a louder master gains nothing there, but DJ stores and club play don't normalise. Most trance producers master for the club and let streaming turn it down. Mastering much quieter for streaming only makes sense if you want more dynamics there.
What makes a good reference track?
A released track in the same style and tempo range that you think sounds great on a big system. Use a lossless file (WAV, AIFF or FLAC) if you have one: MP3s lose some top end.