Pick the last version you played and your class at the top of the page: you'll see every changed spell with its values before and after. The Items, Sets, Dungeons and Professions sections cover the rest of the game.

It's extracted from the game files at every update, thanks to the open source dofusdude project, then compared automatically. Nothing is copied by hand, so nothing gets left out.

A buff makes a spell or item stronger (more damage, lower AP cost…), a nerf makes it weaker. The badge only appears when the direction is unambiguous; otherwise the change is shown without a verdict.

Yes: it checks every day for a new Dofus version and updates shortly after. The version used is shown at the top of every page.