Stats: Expected number of cards
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This add-on previously supported Anki 2.0. You can download the last version supporting 2.0 here. As Anki 2.0 has been discontinued, no support is available for this version.
All Anki 2.1.x Add-Ons
Does exactly what it should. Though the limitations of that indicator are obvious, as explained by the other review (but that really shouldn't justify a bad rating).
[I am still hoping for someone to fix the Forecast (right now it only takes into account the next review of a card, which makes it completely inaccurate if you add many new cards)....]
Probably makes sense only for the short term, because it considers only intervals (“frequencies” in the description), showing the sum of “1/ivl” values of cards. In the long term, intervals change according to eases; however, that would take too much time to calculate for the statistics window (this addon already takes significant time), and cannot — simply and precisely — account for lapses, suspensions, deletions and additions.
Here is an add-on for single-card time forecast https://ankiweb.net/shared/info/2189699505
Here is an add-on for deck-wide time forecast https://ankiweb.net/shared/info/3246851123
Shows nothing but the header for some of my decks; probably because they don’t contain any cards directly.