Simon icon Simon
Flexible server monitoring

Introducing Simon 5!

Simon version 5 is now available. It is a massive update, introducing a much-requested feature: syncing the Simon data between multiple Macs, plus a Simon Status service, a Link Checker filter, improved Find filter, iMessage and Speak Error notifiers, a new app icon, and much more.

Important: please note that Simon 5 requires a minimum of macOS 10.12 (Sierra), and is a paid upgrade from Simon 4. Purchasers since September 1, 2020 automatically get a version 5 license (that also works in previous versions).

Read the Simon What's New page for details.

Free Disk Space Alert


I would like to set an alert to fire when a disk space threshold is breached. Ideally stated in kb/Mb/Gb or as a percentage.

This would seem like a fairly common request, but I have searched and can't find it within Simon. Have also searched this forum and can't see this having previously been requested.

Any help appreciated (sorry if I am missing something obvious)


David Sinclair's picture

Re: Free Disk Space Alert

You could use the df -hl unix command to get the statistics on the local disk volumes.

It includes a capacity percentage, though extracting and interpreting it might be a little tricky.

In version 2.6, coming soon, you'll be able to more easily filter the output to extract the capacity percentage and get notified if it changes relative to a specified value.

Re: Free Disk Space Alert

Thanks for the response.

I think I'll wait for 2.6.