Works a bit Rated 4 out of 5 stars

This addon freezes thunderbird all the time. It also freezes many other windoze apps too when thunderbird is frozen that use the same subroutines. Suggest using it, then disabling it, and only enable/use when you need to sync manually.

Update: Gsync isn't why TB is freezing. Will continue investigation: thanks for replying Josh!

If it freezes while synchronizing I suggest making a new address book and setting up sync with it to see if it syncs more quickly. The Mork DB format used by the TB address book seems to degrade and perform very poorly sometimes, though I can never seem to recreate the problem.

If you don't want to do that you can at turn off automatic synchronization in the gContactSync preferences instead of disabling/enabling and restarting Thunderbird.


Taugt leider gar nichts Rated 1 out of 5 stars

Synchronisiert leider nur mit dem Nirwana: die Kontakte werden zwar von Thunderbird zu hochgeladen, aber sie erscheinen dann NICHT in Gmail ( ! Umgekehrt werden die Gmail-Kontakte nicht nach Thunderbird synchronisiert. Zwischen Gmail und iPad habe ich kein Problem, aber innerhalb Gmail klappt's nicht.

I really like this, but lately issues... Rated 4 out of 5 stars

Have the import for facebook and Twitter stopped working? Both of these options do not seem to do anything anymore. The logins do not complete. Also the app on the Facebook site, shows the broken app icon.

Excellent Rated 5 out of 5 stars


So far so good! Rated 5 out of 5 stars

Working very well on TB 45.4.0.
Thank you for this much needed addon.

Really good Rated 5 out of 5 stars

I'm using this Add-On for some time now, and it works great. Thank you

Essential app for google contact users Rated 5 out of 5 stars

This is a great app saving a lot of time to manage the emails and its associated addresses. I don't have to update the google contacts manually because of the 2-way syncing capability of this app.

I had one issue with the recent 2-step verification update in Google account. After the setting, the syncing did not work. I removed the app and the address book from the Thunderbird, and reinstall it. Now it works fine. I hope this helps anyone who has this kind of issue.
Josh, Thank you very much for this app.

Good addon but additional email addresses are not searchable! Rated 3 out of 5 stars

If you have more than 2 email addresses configured on a contact, you will not able to find the contact using the search field in the address book... Could you please fix that?

This user has a previous review of this add-on.

like a charm Rated 5 out of 5 stars

thank you, your add on work great, all my address are well organized, mi pc run Ubuntu 16.04 and Thunderbird 45.2.0

Buggy Rated 1 out of 5 stars

It has bugs. After I installed this I noticed that the contacts I added through my android phone got overwritten!! Once I uninstalled it, now my android phone and Google web account syncs up properly.

Make sure your phone, computer, and Google account all use the same timezone, and that your computer's time is synchronized with a network server.

It's good app but is not working now Rated 4 out of 5 stars

About a month this great app stop sync the contacts. Please check.

I have thunderbid 24 and no changes.

What happened before it stopped working? Did you upgrade Thunderbird, change any sync settings, change to a new phone or upgrade your phone, etc?

Won't work for me. Rated 1 out of 5 stars

Freezes up my Thunderbird so I have to exit and re-enter the program, I was disconnecting it and running it manually... that worked ONCE. Now it doesn't even sync anything anymore.

It shouldn't take more than a few seconds to sync a reasonable number of contacts (up to a few thousand). Were you synchronizing with a new address book or an existing one (like Personal Address Book)? Your address book could be corrupt, especially if you killed Thunderbird in the middle of a sync when it may have been writing to that address book. Try syncing with a new AB.

Perfetta!! Rated 5 out of 5 stars

La utilizzo ormai da un pò e devo dire che funziona veramente bene. Ottimo lavoro!!!

This user has a previous review of this add-on.

Caution with Mulitple Address Books Rated 3 out of 5 stars

I have 2 address books in TB that I want to sync with Google.

NONE of the records were common in the two source ABks. Google contacts was empty.

All the contacts were synced, but all the phones now show Mobile in Google and in TB. Some numbers got copied so they show up as First & Third, First & Second, Second and Third numbers.

Essentially a complete waste of time.
I have to start over from my backups.


Just needed this Add on Rated 5 out of 5 stars

Thank you developers. You have helped a lot.

Works as described Rated 5 out of 5 stars

Works smooth and alot of functions are automated (like recieving the api key etc). Also its quite neatly integrated into Thunderbird. Great Work!
As Feature it would be great to simply exclude contacts from sync, if they have no email adress.

Works pretty good Rated 5 out of 5 stars

User interface is simple, works as it should be. No encoding errors (some user wrote here), fast, and easy to use. Recommended.

Loads garbage, then crashes Thunderbird Rated 2 out of 5 stars

I was pleased with the UI at first sight. I then figured out that it created 370 new contacts in Thunderbird, most of them duplicates (up to 7x) and almost all with broken encoding and random characters in random fields. Shortly after, Thunderbird crashed. It also crashes when trying to use write-only mode.

not importing all contacts Rated 4 out of 5 stars

i work for the IT department at a car dealership
i have this set up on about 15 pc's i got it to show/import all the groups but some of the groups are blank ex audi sales the group is there but when you click on it there is no email addresses any suggestions ?

works great before Thunderbird 45 Rated 3 out of 5 stars

After updating to Thunderbird 45, this now only works if I go into my address book and manually tell it to sync. None of the menu options on the main screen work.

This review is for a previous version of the add-on (2.0.10). 

I believe I've identified the problem and have released updates to gContactSync (2.0.11) and Contact Photos (1.1.12). If you need it to work before the update is reviewed you can disable all other add-ons and restart Thunderbird.