anitrakt is a simple browser based tool that aims to keep your anime profiles up to date based on your trakt.tv history (currently limited to Myanimelist.net).
While they goal is to bring over as much of your show and movie data as possible, this cannot be done realistically given the difference on their listings (individual shows vs. single season entries).
Here are some things to note before you start:
If you've registered more episodes on the target site no update to it will be made.
If you've rated a show on trakt it will overwrite the existing one.
The season rating will be used for each individual entry if present and otherwise fall back to the show level. This might lead to some unexpected scores but you'll be shown all updates and you can easily adjust them with another rerun.
Movies entries which are actually multiple OVA episodes.
→ TMDb follows the first released format, and does not allow "duplicated" content between the Movie and TV Show sections. People tend to readded this stuff despite being invalid. It can sometimes also take them a while to correct things (eg. Battle Angel Alita which was recut as a Movie for the US but was actually a two episode OVA in Japan).
Episodes in the "Special" Seasons (which are mostly indivudual OVAs or specials)
→ Frankly this would require a lot of additional effort for very little gain and the Episodes within tend to be moved around or be removed due to not being the proper specials anyways.
Shounen titles split across artificial/arc seasons not fitting their respective anime DB entry
→ TMDb still has a lot of legacy splits in shounen seasons according to story arcs given the nature of their data origin (which was heavily influenced by TVDB which in the past couldn't handle big seasons). They have a master list where they put the shows on that need the seasons combined, unfortunatly that one has been mostly dormant in the last couple of years.
Once they do the necessairy adjustements they can be added to the index here.
Keep in mind the changes happen kinda random so those might actually also break stuff with the sync. Please let me know if you encounter this!
Example shows still not merged:
Dragon Ball Z, Naruto, HunterｘHunter (2011), One Piece...
To match up trakt's data to the anime databases we have to manually link the IDs together. Due to the nature of this it there will never be a complete index and it's bound to have occassional gaps due to sometimes changing metadata on TMDb or incompatible content.
The index of the mapping table can be viewed below: