PeakHour 4.1.18 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Internet & Network Tools, more precisely Network tools. We recommend checking the downloaded files with any free antivirus. This Mac app was originally created by Digitician.
From the developer:
PeakHour is a beautiful, network traffic visualiser that lives in your Mac OS menu bar. It provides an instant view of your Internet or WiFi activity in real-time.
PeakHour is perfect for monitoring your network devices: Internet, WiFi, NAS, servers and more. PeakHour gives you a real-time visual view of how much bandwidth your devices are using.
You may want to check out more Mac applications, such as PeakHour Compatibility Check or Examinet, which might be related to PeakHour.