Macometer
4
$7.99

Docker has been writing about 40 MB/s to disk for 12 minutes.

Storage leads with what you usually came for: how much space is free on each volume. Then write and read each get a chart and a scale, and name the app behind most of it.

macometerApple M4 Pro, 48 GB
Storage 
412GB free of 994 GB
Macintosh HD582GB of 994 GB
Archive660GB of 2.0 TB
Top apps by disk
Write
46MB/s
Docker
Read
7.0MB/s
Docker
Last 10 minutes
Written today6.2GB
Read today12.6GB
Written, 7 days212GB
Written, 30 days884GB

Docker is writing the most, 40 MB/s.

40MB/s6.1MB/s4
4.5MB/s400KB/s5
305KB/s71KB/s14
195KB/s97KB/s7
116KB/s42KB/s2
92KB/s72KB/s4
90KB/s136KB/s4
58KB/s9.4KB/s3
41KB/s13KB/s3
35KB/s50KB/s1
12KB/s13KB/s1
0KB/s24KB/s2
GPU
9%
Memory2.7GBRenderer8%Tiler4%
Top apps by GPU
Firefox6%
Figma1%
Xcode1%
macOS1%
Storage
53MB/s
Read7.0MB/sWrite46MB/sFree412GB
Top apps by disk
Docker46MB/s
Xcode4.9MB/s
macOS376KB/s
Firefox292KB/s
Network
302KB/s
Down285KB/sUp16KB/sLinkWi-Fi
Top apps by traffic
Firefox153KB/s
Music61KB/s
Figma19KB/s
Slack15KB/s

Simulated data, running in your browser.

A capacity bar per volume.

The startup disk gets the thicker bar. When a boot volume drops under 5% or 5 GB free, the verdict says so.

Read and write are separate.

Each has its own chart and scale, so a quiet read never disappears under a loud write.

Totals when they say something.

Written and read today, with 7 and 30 day totals once they differ from today.

Checked against iostat.

Averaged over a run on an M4 Pro, Macometer read 52.7 MB/s where iostat read 51.0.

$7.99 for the first 25, then $14.99, once. No subscription.