Wow, somehow this escaped me all these years. I feel like I’ve got a bunch of fresh XKCD to read now.

For the uneducated: On a mobile browser you just press and hold the comic (long tap). On a computer you hover over the image and the alt text will appear next to the cursor.

The alt text in this one was:

Likely at first, but Sync for Reddit has a TestFlight for an iOS Version. I suspect that effort could be carried over if the porting process isn’t too arduous.