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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->Add-ons menu item, then click on Get Add-ons and paste in the code.

All Anki 2.1.x Add-Ons Contact Author


on 1683221642
Works well. Note that whenever I restart Anki, this add-on shows N/A until I do another review (regardless of if I have already done reviews prior to the restart). To those complaining about the add-on only showing N/A: Do one more review and then check again.
on 1681753007
Is there a GitHub or other place I can report issues? Please respond with a link if there is or how else we should contact you.
on 1676555734
Very useful. I hope it gets updated someday.
on 1675980608
Only show N/A for anki 2.15. So does the fork one from glutanimate. Please, show me how to fix this.
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on 1673913450
Very useful!
on 1669975410
Very useful
on 1669663045
Thank you for the addon!
on 1660989519
The addon is very useful, but i cant see some of my intervals
For example, in the deck, my learning steps are: 30m 4d. The add-on only shows statistics for the 30m and graduation interval
Please advise how can this be fixed?((

Also, please tell me, does the Review Retention column also display the learning intervals, or only the intervals of graduated cards?

I would be very grateful for an answer!
on 1660307624
Great add-on. Thank you very much, it is really motivating.
on 1657965978
It works (2.1.54)
on 1652858984
It works.
on 1652781804
Only shows N/A :(
on 1648626690
USED TO work on 2.1.49. As someone else commented, shows N/A instead of the % now!
on 1643906073
doesn't show the percentages. only N/A
on 1641413623
Thanks for this usefull extra stats. With your add on I can get deeper insides about my learning. Really appreciate it! The add-on works without any issues and is great! Keep it up and thanks for this add-on!!!!
on 1640105559
Smooth as butter
on 1637778767
not working on the lastest version :(
on 1635180516
worked perfectly
on 1635104300
It's work very well!
on 1634759501
I couldn't really see where to check this true retention thing, I needed to shift + clic on Stats. I love it.
on 1633725138
Very good
on 1631111520
Works as advertised. Useful stats to monitor your progress.
on 1630170688
LOVE this so much, makes my planning that much easier. 10/10
on 1628625425
true retention past day shows today data
on 1628016187
So good. Just what I've been looking for.
on 1625743331
Good! 😋

I don't really use it that much, but it works as advertised, I can't deny that.
on 1625214471
Not working on the latest anki version. I hope the developer updates it soon!
on 1624427746
Does not work on 2.1.35 even after using shift + stats. Shows everything else except retention :(

Edited: it works now 1 month later with true retention showing up, still waiting on supermature rate.
on 1621532762
Does what it says on the box.
on 1620841026
Useful add-on to help me adjust intervals for my decks, thanks!
on 1618742325
I don't know if it helps but this add-on only worked once I restarted the app and shift-click stats. For those who didn't find it show up, you may try this to see if it works.
on 1617151396
on 1616943147
gives one some needed motivation.
on 1615745439
One of the best addons
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on 1613422168
Keep it up with the great work. Thank you
on 1612802209
edited my review. It's a brilliant add-on

Guys, PLEASE shift click ie hold down shift+left click on 'stats'. PLEASE
on 1612736364
Nice, thank you :)
on 1612464451
It's one of the most useful add-ons I've ever tried.
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Useful numbers to see :) Thanks!
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EDIT: Oh, man. You need to hold shift down nowadays to view the old stats screen to use it. Sometimes it feels like anki goes out of its way to break every addon when it updates lol
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on 1605202202
it doesnt appear on mys decks, dont know why
on 1604787941
the new update ruined the stats, this is so helpful as it brings the old style back when shift-clicking
on 1603039934
Shift + click to go to true retention stats on anki version 2.1.33
on 1602364840
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.
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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 :)
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on 1580343405
very good
on 1578595789
This is great!
on 1571863176
Must have!
on 1570199990
Thank you
on 1569386722
Very good thank you.
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!
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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!
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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!
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Great info
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Because it works
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on 1496534400
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Super useful

This should be in Anki by default
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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.
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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.
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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:
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