A, C and Z frequency weighting with Fast or Slow time weighting, and Min and Max since Start. The filters are derived from the IEC 61672-1 analog prototype. A clip warning tells you when the input itself is overloading.

C- or Z-weighted Peak, and a Leq accumulator with a window you set anywhere from one second to 24 hours.

Switch any channel to LUFS to check a broadcast, streaming or podcast mix to ITU-R BS.1770 and EBU R128. Momentary, Short-Term and Integrated loudness, Loudness Range and True Peak, against a target you choose: EBU R128, ATSC A/85, streaming, podcast or your own.

Fractional-octave banding from 1/1 to 1/48, a line trace, or both at once, with peak hold, a hover readout, and other channels overlaid in their own colours.

A scrolling time and frequency heatmap under the spectrum, on the same frequency axis. A sustained tone holds its position and shows as a bright streak.

Overlay a target curve on the spectrum, including the cinema X-Curve (SMPTE ST202 and ISO 2969), with an adjustable reference level.

Detects tones that keep growing while ignoring music, then shows the frequency and the nearest note with its offset in cents. On or off per channel, with adjustable sensitivity.

Set the thresholds, in SPL or in dBFS, and the colours for each range, so anyone glancing at the screen knows where the room stands. Loudness channels turn green on target, red above and yellow below.

Graphs the meter from Start to Stop, for whichever weighting or metric it shows, on every channel. Zoom from the whole session down to ten seconds, and jump to the loudest or quietest moment.

Add as many channels as your devices provide, each with its own name, colour, calibration, gain and weighting. Show one on the meter, another on the spectrum, or open any channel in its own window with the layout you want.

Read a left and right pair as one stereo source, power-averaged so out-of-phase content does not show false notches. Console buses, network audio and loopback inputs read in dBFS automatically.

Analyse whatever apps on the Mac are playing, with no loopback driver to install. Requires macOS 14.2 or later.

Load the calibration file that came with a USB measurement mic, or calibrate against a reference tone for higher precision. Changing the preamp gain is compensated automatically on interfaces that report it, so there is no need to recalibrate.

Export a session as a PDF report, a PNG image or summary text: input, calibration, MAX and MIN with their time, session Leq, L10, L50, L90 and time spent above each threshold, one page per channel.

Save every setting under a name and switch between setups from the menu bar. Export a profile to move it to another Mac, or share one Mac without touching each other’s calibration.