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.


If you have a query, please check the Frequently Asked Questions first.


If you like, you can send an email instead of using this form. David, the developer, will get back to you as quickly as possible.

Contact Form

You are welcome to use this form to contact David. He reads all comments carefully, and if you provide an email address and he has any questions or comments, he'll be in touch. If you do want a reply, please ensure your email address is entered correctly, and your email client will accept mail from All fields are optional, but more information is more helpful:

Your name:

Email address:

Confirm email address:

We hate spam as much as you do; as per the Privacy Policy, your address will only be used for any needed reply.


Dejal product:
Licensed user

Product version:

Where did you hear about this product / website?

Mac model:

Mac OS version:

iPad / iPhone / iPod touch model:

iOS version:

Where do you use the Dejal software:

Contact type:

Desired response (we will reply as quickly as possible, if appropriate... usually within hours):

Are you human or a spambot? Please type "ground" as a spam protection: