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True Retention

<10kB. Updated 2017-11-20.
The author has shared 2 other item(s).


NOTE: In modern versions of anki (2.1.33 and newer), you ***MUST*** open the Stats window by shift-clicking in order to view addon-based stats information. If you do not hold shift, a different stats window will appear where addon-based stats ***do not display***. This behavior is ***covered in Anki's documention***. Adds a few new lines to the Statistics window, including True Retention (pass rate calculated only among "Review" cards) and a few placebo stats. "True Retention" is a better indicator of learning quality than "Again" rate. Hotfix: Round %age to one decimal point (same as Anki's "correct rate") Update: Added more time periods. Update: Already supports Anki 2.1.x but have to upload a new file for it. Yes, the license of this addon is the same as the code it originates from.


As add-ons are programs downloaded from the internet, they are potentially malicious. You should only download add-ons you trust.

Supported Anki versions:

To download this add-on, please copy and paste the following code into Anki 2.1:


If you were linked to this page from the internet, please open Anki on your computer, go to the Tools menu and then Add-ons>Browse & Install to paste in the code.

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 Contact Author


on 1600050172
It doesn't work on 2.1.33
on 1599715486
works well!
on 1599568772
Works great, but it does not work on 2.1.33
on 1599283696
It does not work on 2.1.33
on 1597174474
Shit + click on stats does work.
on 1597012034
Pressed shift while clicking "stats" as people suggested below. Still shows "0" or "N/A" for the stats. Not working.
on 1596933975
Can confirm that holding "shift" + pressing stats button at the top (next to browse/sync) does work.
on 1596672809
This works fine with the latest (2.1.29) anki desktop; hold down "shift" while you hit the "stats" button.
on 1596363527
Out of date in the newest versions. Don't update Anki unless you don't mind losing this addon. I'm disappointed, because I used this every day.
on 1595866404
Doesn't work in a proper way starting version 2.1.26 of Anki when you want to see the stats for a deck life. It seems it hasn't been updated in a long time which is unfortunate because I really liked the addon. Hope the developer of the addon is going to attend to this issue.
on 1595789885
Unfortunately doesn't work for me anymore since the 2.1.28 update.
on 1594932045
Could use some documentation. What is "supermature"? What are "placebo stats"? What is counted in "passed" and "flunked" reviews? Hard to know how to interpret this stuff when it isn't defined.
on 1594783064
Great addition.
on 1594316570
on 1591790626
Amazing !
on 1587321556
on 1586398548
Great. Thank you!
on 1586082978
love this addon
on 1585931929
Great - one question I can’t seem to get answered anywhere. What is supermature? Mine has always said n/a.
on 1584821161
Love it, thanks :)
on 1581870723
on 1581022272
on 1580343405
very good
on 1578595789
This is great!
on 1574942003
Very useful!
on 1571863176
Must have!
on 1570199990
Thank you
on 1569386722
Very good thank you.
on 1569260052
on 1567780383
Good, thanks!
on 1566057415
Works like a charm. Very relevant statistical info.
on 1562194164
Very useful to become aware of the actual retention rate quickly!
on 1559445348
great addon, helpful for knowing the retention
on 1559156368
Very informational!
on 1558965281
Great Bro.
on 1557998089
Thank u
on 1557089324
Super helpful!
on 1557087613
on 1556691916
on 1552845848
on 1546036892
Really nice addon to better view statistical data about learning sessions.
on 1545520788
Very useful.
on 1544395820
Super useful, thank you!
on 1544309441
Exactly what I was looking for after I saw it in a youtube video where someone else was using it. Great!
on 1536341903
Cool additional stats
on 1532360519
Very helpful.
on 1531946794
Much Better!
on 1531406528
Much better than the standard overview!
on 1530638251
on 1525651200
on 1525651200
on 1525478400
awesome; should honestly be part of the standard anki release
on 1525392000
Makes me realize just how shit I am every other day, great addon
on 1521763200
much more informative and helpful than the "again count" stat ... thanks!
on 1519516800
on 1518825600
Great info
on 1515110400
on 1511827200
Because it works
on 1502236800

on 1492819200
Super useful

This should be in Anki by default
on 1490918400
RE:How to use this add-on?

You have to press the "show statistics" button (next to sync) in order to show the statistics.
on 1490400000
Howto use this add-on?

I have search for many days and I haven't find any instruction about how to use these add on can any people teach me(by PrtScSysRq) thanks.
on 1474416000
Better than you think

Usually, my True Retention is better than my Again count. It shows that I do much better than I would have thought otherwise, which really helps with motivation.
on 1463702400

For me the more statistics the better, the more control and more insight into the learning process I have.
I wish there was a year and a deck life true retention. It would be great if users could edit and set there own true retention standards. I invite you to a discussion: