Monarch doesn't have any ads so you shouldn't need to use an ad blocker but if you have one set up you may wish to whitelist or unblock this URL:
We release new features using a ramp of 2 to 3 days with split.io so whitelisting this URL will ensure you get new features earlier. If you don't whitelist split.io that's fine too - you will still get the full feature set of Monarch once it's released to 100% of all users.
You may also notice that we use the Facebook and Google ad pixels. These are only used to tell us that someone clicked on an ad from Facebook or Google that we spent money on. None of your financial information is ever shared with Facebook or Google. If you block these pixels it won't cause any functional issues.