A shoutout to SuperMemo here - one of the oldest SRS out there. Their first version was on Amiga, if I remember correctly, and the newest ones support iOS, use LLMs and all the other tech :)

I’ve never used Supermemo (still windows-only I think) but the data on their blog is really awesome. The founder basically pioneered the idea of SRS.

iOS? No, certainly not. The recently released version just did the jump from Internet Explorer to Edge support.

You probably mean the confusingly identically named SuperMemo on supermemo.com (not .guru), that is indeed a spaced-repetition software, but is not the venerable and famous real SuperMemo with a gazillion of features and research behind it. Just a simplistic knockoff. Strangely by the same author.

Spaced repetition software system? That's not the usual meaning of SRS, but good to know some people use it like that.

Good to know but these days if you try to google it that's not the result unfortunately.