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I imagine some more advance air filters may come with apps which remind you to replace the filter.

They can, but I don't like adding extra 3rd party stuff to wifi, can bog down the bandwidth.

I think some air filters may come with a simple Month calendar which you can manually set by rolling a cylinder to dusplay what month you changed the air filter.

I don't think any of them come with, unless it's programmed into the app to do so.

I guest most air filter system are very basic where it just a fan, and a filter, to keep the cost down.

they are, the more better ones cost a lot more and might not be as easy to get.

I think most inexpensive stores like discount stores may also sell air filters where the fan breaks more quickly.