Elder Scrolls Online has limited modability due to being a massive online multiplayer game, whereas Skyrim is highly moddable and customizable.
The main differences between Elder Scrolls Online vs Skyrim are: Main Differences Between Elder Scrolls Online vs Skyrim Here are some main differences between the two games. One game focuses on multiplayer gameplay, with a heavy dose of solo play within a world populated by other players and the other focuses solely on solo gameplay with a world populated by the player NPCs. Having different developers means the general mechanics of the games are different and geared towards different audiences. However, these two games vary significantly because they were developed by two completely different studios.
Both games were published by the same publisher Bethesda Softworks and they both take place within the Elder Scrolls World and uses the established lore for its stories and quests.
Elder Scrolls V: Skyrim and its semi-quasi rival game Elder Scrolls Online are two games that are often compared to each other.