When trying out this feature I get an error message:
Unfortunately I don’t know what the issue is, but I have the same issue. I get “TypeError: Load failed” when I click “simulate” on the desired retention simulator screen for any of my decks
@Ankiuser7 @Zza For now, try running this on desktop Anki instead.
I’d imagine that the problem might be the swift version of mediasrv.py not exposing the simulate_fsrs_workload endpoint but that is a complete guess.
Is there anyone who the graph does work for? I don’t have an IPhone and can’t check for myself.
Can confirm the issue on a new collection.
I’m also getting this issue on iOS, and I’m not near my PC to test it out. Any updates?
This is a known bug in the AnkiMobile app.
- The problem is in the experimental “Help Me Decide” FSRS Desired Retention Simulator screen. When you press the “Simulate” button, a “TypeError: Load failed” error message appears and the graphs are not generated.
- The bug was reported to the AnkiMobile team on November 10, 2025, and it is not yet fixed as of version 25.09.
- I verified that the bug does not occur on the Mac desktop Anki app 25.09.2. When you press the “Simulate” button, the retention graphs are generated.
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