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CHECK

Analyzer Plugin by KERN audio
MyKVRFAVORITE9WANT16
Free
kernaudio.io
CHECK
CHECK
CHECK by KERN audio is a Virtual Effect Audio Plugin for macOS and Windows. It functions as an Audio Units Plugin and a VST 3 Plugin.
Product
Version
1.2.5
Sys Reqs
Windows 10+ (64-bit). any DAW supporting VST3.
Product
Version
1.2.4
Sys Reqs
macOS 10.13+ (High Sierra or later). Apple Silicon and Intel. any DAW supporting VST3 or AU.
Tags:AnalyzerCHECKKERN audioMeterMeter analyserMeteringUniversal 2 Binary
Effect
Formats
Copy Protection
None

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KVR Rank

Overall: 1617   1410   1577

30-Day: 1257; 7-Day: 4513; Yesterday: 8861

KERN CHECK is a free spectral mono compatibility analyzer for music producers.

see exactly which frequencies collapse when your mix is summed to mono. CHECK splits your signal into 40 perceptual frequency bands (ERB scale) and measures the correlation in each one. the result: a real-time spectral display that shows you precisely where phase cancellation happens.

Features:

  • 40 ERB band spectral correlation display.
  • Overall mono compatibility score with color-coded zones.
  • SPEED knob: analysis smoothing from instant to averaged.
  • FOCUS knob: zoom into a frequency range.
  • BASS knob: low-frequency detail control.
  • ZOOM knob: vertical display scaling.
  • MONO/SIDE listening modes.
  • Zero latency, under 1% CPU.

No license key. no account. no iLok. just install and open in your DAW.

CHECK is the analysis side of the KERN plugin series. KERN SMOOTH, KERN WARM, and KERN WIDE use the same ERB spectral engine to fix the problems CHECK finds.

Latest User Reviews

Average user rating of 5.00 from 1 review
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CHECK

Reviewed By KVRMixerMaster [all]
April 7th, 2026
Version reviewed: 1 on Windows

KERN Check has become a crucial part of my final mastering chain because it goes far beyond a basic mono‑compatibility check. I use it to verify the integrity of my mix before printing the master, and it consistently gives me confidence that everything is translating as intended. The ability to isolate and confirm the side information is especially valuable — switching to the side channel lets me instantly confirm that my wide‑field elements, from ambience to spatial effects and stereo textures, are all present and behaving exactly as I mixed them.

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