To block your own visits on your website on Safari, you can use the about:blank extension. You can download about:blank via the Mac App Store.
This is external software, so we can’t guarantee your browsing data is safe. Use at your own risk.
To install this extension and use it for Simple Analytics, you can follow the steps in this tutorial.
You will need the script URL at some point:
Do you have a custom domain? Make sure to add that to about:blank. For example:
https://queue.simpleanalyticscdn.com to the block list.
On iPhone, you can download about:blank on the App Store. It should sync your block list when you have iCloud enabled. If not, you should add the above URL(s) manually.