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App will not register completed lessons

I'm using the iPhone app and finding that my completed lessons aren't "sticking." I will complete lessons, but when I close the app and come back, the lessons I completed will revert to incomplete. If I look on the web, they are also not synced. Very frustrating to lose progress. In one case, the skill is marked as complete, but when I go into it, two lessons have reverted to incomplete.

I have deleted and installed it again twice.

Anyone having similar problems?


February 11, 2014



I have same problem. I am so sick for re-doing same skill over and over.

August 3, 2014


I have this problem too. I'm waiting on a response from kristinemc.

February 13, 2014


Hi I also have the same problem with the German tree, using duolingo on an iPhone 4S iOS 7. Every time I reconnect to the internet all the offline progress gets erased. Happens with all the lesson for example Passive V. Politics. I've basically given up offline use at this point.

October 2, 2014


I have the same problem with offline mode. It has started relatively recently. Before it was very rare to lose the offline progress, even after turning off the phone. Now it happens every single time when I move from offline to online... (P.S. also using iPhone app)

February 13, 2014


I have the same problem, I finished a course on my iPhone in offline mode, logged into Duolingo on my computer, it showed that the course wasn't completed yet, so I logged in from my mobile application to update it. On the mobile app, at first it showed properly that the course was completed, but after a while it went online and it started showing that it was incomplete on the phone too.

November 17, 2014


Are you doing these lessons in offline mode? Can you let me know which skills/lessons as well? Thanks!

February 11, 2014



October 10, 2016


I'm almost always online

October 10, 2016


For the most part, yes, I am doing them in offline mode. I typically do them in the subway (offline), and then finish them up at home or at lunch (online). The trouble with the lessons not registering as complete began pretty recently -- perhaps with the recent update.

Occupation is the one I finished and it showed up as completed (yellow), but when I opened it, it showed two lessons incomplete. I uninstalled and reinstalled the app, and now it shows the whole skill as incomplete and 2/4 lessons complete. Adverbs has also been a big problem. It pretty much won't save past 4/9 even though I've gotten to 7/9. Infinitive verbs similarly took a long time because it kept resetting. The trouble mostly began around infinitive verbs.

Thanks for the help. I love using the app but it's extremely frustrating to lose progress.

February 11, 2014


So incredibly stressful that I made a new email address and user name and started again. Since the new tree, finished lessons kept going to red/green for no earthly reason, just a program glitch. Some I did again, perfectly, five times before finally quitting and starting fresh. At that time, I had been using one tablet. Tonight, it has either failed to synch OR the glitch is back. If it is,I will ignore it and just learn the French, or I don't know. Duo never seems to answer the enquiries about this. Great app for learning, too.

May 12, 2015


Any updates on this? I've had to pretty much stop using the app because of the offline problems. It also seems to have issues syncing with my completed skills on the web.

February 23, 2014


French didn't synch today after I completed a lesson offline. When I then went online it was not showing as having been completed. Can you help? Thanks

May 14, 2014


I am having this problem too. I used to just switch Internet/network off, finish the unit, then reconnect when I had wifi/better network. The lessons used to upload just fine with this method. If I did the lessons online with an intermittent signal I would lose a few lessons here and there but even then it would upload a few. Any resolution to this problem? I still havent upgraded to iOS 7 yet if that provides any insight. Thanks!

March 7, 2014


I'm doing Spanish, in the offline mode as part of my morning commute, on an ipod running ios7. I'm currently working on food. I've completed the lesson 4 twice and lesson 5 once, and now it tells me i still haven't completed it and to go do it again. It's like it completes and gives me the lingots for completion of the series, but when the screen refreshes it forgets and says need to complete 4 & 5 again. (My online profile is currently wrong, as i have not been near wifi since i completed 4&5) I don't mind the practice and it seems to be accruing the points for it,but it seems like a bug.

April 10, 2014


Same problem. Completed the following multiple times now in offline mode: V. Future Arts Fut. Per.

June 6, 2014


Having the same problem. Updates on this?

July 9, 2014


I'm having the same problem. I lost 4 modules of progress after a 10 hour flight. Please somebody have an answer!

July 9, 2014


I don't understand why this is so difficult to implement properly?! Surely when you work offline it should just save (locally) your progress, then when you next connect, it just updates your online account with your most recent progress! How can this be so difficult that it is still not fixed 5 months later? Should be about three lines of code!!

July 29, 2014


i have this problem even with online mode.

August 21, 2014


Me too!

March 6, 2015


same problem. Android - gingerbread

October 23, 2014


I have the same issue despite being online all the time. Also the streak count of my app and my online profile differ.

October 30, 2014


I have to add to this thread. I have just done a couple of lessons during my lunchbreak, connected via not the best EDGE connection. I completed both lessons, came back into my office and connected to wifi. Having checked the website, I see that neither lesson has synced and now my phone (iPhone iOS 7) says I haven't completed the lessons either. Frustrating to lose progress. I wonder if there is sensitivity to flaky internet connections, perhaps should be an option to not attempt connections over anything but decent 3/4G or wifi

November 14, 2014


I have had exactly the same problem for about a year now. I managed to put up with this whilst learning Portuguese but now am about to stop using the app as it is so frustrating.

I use the app on the tube every morning and usually complete 2 -3 modules. When i go back online the progress is lost and I have to re-do the modules. I just can't take it any more!!!!!

Please fix or I will stop using this great app,


January 6, 2015


Even when i am online throughout....it doesnt sync..... After every 2-3 lessons, they get reverted, even without closing the app (android kitkat)

January 20, 2015


I have the same problem and is really frustrating

March 3, 2015


Yes, that happens to me too! I hate having to redo lessons I've already finished. Is there a way to fix this?

November 2, 2015


Hi! What was the time period between closing the app and opening again that you noticed you needed to re do skills?

June 29, 2016


I didn't close the app, i just came out of my lesson

October 10, 2016


I just did a lesson In italian, on my IPad, and guess what IT DIDN'T REGISTER. Does anyone know how to fix? And it only happens when i'm doing italian. Once i learned a 7 button skill then had to learn it again!

October 10, 2016


Will this help? Don't close app when doing lesson, I was playing around, and I think that could help.

Please reply

October 10, 2016


I have the same problem of the lessons and practices not showing as completed . I cannot move from Lesson 5 to Lesson 6. What is the fix Catherine

November 25, 2016


Update from 2017: I'm having the same problem!

January 10, 2017


Same here! It started yesterday. I have an over 500 day streak so it's realllllly annoying!

January 11, 2017


DANG SON that's impressive! XD

January 11, 2017


I am experiencing this bug on Android. Immediately after completing a lesson the "completed" count reverts to what it was before. It happens about 1/3 of the time I complete a lesson. Makes the app almost useless. How can such a bug be allowed to persist for so long?

May 28, 2018


I'm having the same problm

February 27, 2019


Has anyone tried to do offline lessons after installing the most recent update, from within the last two days? It was released a couple days after I requested they look into this problem (and they had responded to my question; I had also showed them this thread). Is it working now? If not please try to be as specific as possible as to what is happening. Thanks and hopefully this will be resolved soon!

August 3, 2014


Sadly I can confirm that the new update has not fixed this at all. After installing I am still being sent back to lessons I have completed while offline.

August 13, 2014


Also i have same problem - doing lessons offline and when i connect to internet all progress is lost and i am at the point where i was before started with lessons offline..

October 24, 2014


I had.

April 17, 2015


I have the same problem. Usually happens for me when I do a lesson on the subway with spotty connection. I'm going to try switching to airplane mode while on the subway to help the app understand that the connection is spotty. Will report back.

April 23, 2015


Has there been no solution yet? I've had this problem for a year at least. It's frustrating because like mentioned in some of responses it doesn't to be a complicated issue to fix. Anyone know how to contact anyone at duolingo?

June 13, 2015


No solution :/

June 13, 2015


Me too. Thanks for providing this app for free - anything I can help to amend the problem?

July 4, 2015


I have a laptop for back up, so I tried a slightly worrying answer to the problem. I uninstalled the app and installed it again, keeping my duo sign in details ready to use. So far, this has helped

July 4, 2015


I'm having an identical problem with IPhone app. It simply resets my progress whenever it connects.

August 31, 2015


It really is time that Duo responded to this thread. I read an article about Duo that said some lessons, like adverbs, will go back to 'strengthen skills' purely because there are more things to learn. This does not explain many other lessons ungilding, again and again, immediately, to cover exactly the same work that has just been done perfectly.

Since I last re-installed the app it is behaving better but I am weeks behind. To cheer myself up, I am now doing Memrise, also. This has turned out well. The French is 'fuller' and it has cleared up some ambiguities. It does not foul up, but be warned, it insists on question marks, etc. After a few 'what the heck?!' this is now fine. It actually works well alongside Duo, if you keep the Memrise short enough.

August 31, 2015


Oh, yes, Adverbs The worst skill in the tree (It keeps happenening to me there)

October 10, 2016


It looks like the iphone app does not sync with the PC online account. Also the iphone app has features like "Practice Weak Skills" not on the web version.

February 16, 2016



October 1, 2015


I had the weirdest problem. yesterday I was playing with my duolingo and everything was perfect. all of my tree is gold and I finished another new lesson. this noon I open the app, and see that around 90% of my completed lesson are half completed, or not completed at all. has anybody had the same problem?

October 16, 2015


Did that happen in German course? I think that was because of the course update. They have included more lessons in some skills and also more skills :)

January 15, 2016


This happened to me in the Swedish tree yesterday. I was lucky to have the streak freeze on or otherwise I would've lost my streak without even realising. Very frustrating indeed.

March 2, 2016


Happening to me. I used the app on android for 5 months without a problem. I'm now having to use the iPhone app and it keeps loosing progress when presumably going between online and offline modes. It is now impossible to make progress. YOU HAVE TO FIX THIS ISSUE OTHERWISE I WILL HAVE NO CHOICE BUT TO STOP USING YPUR APP. If it isn't being fixed because of dev costs, then start charging for modules. I'd be quite happy to pay a few pounds for a course.

April 6, 2016


I just checked on my computer and suddenly some of my exercises are shown as incomplete that I completed a long time ago.

June 29, 2016


Having the same issue.

September 28, 2016


Why has not this problem been addressed until now? I never use the offline mode, I'm always online, yet my lessons wouldn't stick after being completed, either on the iPhone app or the website. I'm using iOS 10 and the Duolingo app is up to date.

November 23, 2016


Hi there. I have too the same problem with the German tree, using duolingo on an samgung galaxy s4. I have re-installed the app, but like others the problem still remains. I reported duolingo there is a couple weeks and I did not receive answer yet. I am really frustraded!

June 1, 2017


This is still happening. I use the app primarily on the subway where the wifi signal is intermittent. However, the app appears to be recognizing my progress and opening new labels. Later though, I reopen the app and my progress is gone, sometimes some, sometimes all. It's extremely frustrating. I enjoy this app but am close to giving up. Who else has found something they like that is less glitch?

June 16, 2017


This just started happening on my Japanese course! I use the app online but when I try a diff language course, it keeps the progress. So weird. Used 2 different devices and same issue

July 13, 2017


I'm very troubled that there is no response to the problems stated in this thread. Im doing both Spanish and French and while Spanish is fine, I can do every French lesson perfectly and when I finish it shows it is not done. Even the first basic lesson Is undone, no matter how many times I do it, and I have finished 20 others and all are showing they are not completed, even though I complete them over and over. Why won't they fix this? It's so discouraging that I'm moved to dump the whole thing. Too bad because they have a good basic concept, but apparently the whole system is crashing? Perhaps just too many people are using it.

August 4, 2017


In case it helps, I finally finished the Spanish tree by "testing out" of all the levels that kept un-completing themselves. It's not supposed to work that way but I think the repetition actually helped me retain the material. Have now moved on to Memrise which has more advanced content and is also free (although there's a paid version). Interface is not as cute and it has its issues but I don't lose progress ever...or yet anyway :)

August 4, 2017


My point is recorded but the lessons doesn't show in my italian or spanish history board. I have to remember my last accomplisment and go by memory.

November 29, 2017


can someone help on this.. i am facing the issues since last 5 months and i have not completed any lesson till now.

February 2, 2018


I’m having this problem now and these posts are from 4 years ago?! It won’t even let me get passed this one lesson. I complete 5/5 lessons and then I look and it reverts back to 1/5. I knew this app was too good to be true. I’m all the way at the bottom too. I guess I’ll try another app

April 6, 2018


I’ve also started having this problem on my iPhone over the last week. No progress or completed lessons seem to register. I have to use my iPad or laptop, where everything still works fine. Any help or advice anyone?

April 7, 2018


You might want to try to “test out” of the ones that will not allow you to progress and move forward. I use this on the subway so I’m going in and out of service but it continues to do it at home where my WiFi and service is fine which was annoying. There was a new update yesterday, we’ll see how that works

April 7, 2018


You might read the comments of admin Vivisaurus in these discussions

and submit a bug report via

Use www.duolingo.com in the newest version of a modern browser on your phone/tablet (e.g. Google Chrome, Firefox)

April 7, 2018


I just went back into duolingo, and it has put all my exercises down to level 0, but I can still do them. I do not know which exercises I have done which is very frustrating. I have logged out and then back in, but there was no change.

April 11, 2019


All the time! I am just about ready to quit this frustrating program. Compounded with the changes where you have to "buy" test outs and then they don't stick anyway. No more motivaton. I don't care about the stupid leagues. Losing interest fast. I have 5347 useless lingots that used to make me feel accomplished. My streak of 1198 days is about to go in the trash. If I quit, I'm not trying this program again. I doubt anyone monitors the forums so nobody cares. I used to recommend Duo to everyone but no longer.

May 2, 2019
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