Diep.io (stylized as diep.io) is a multiplayer browser game created by Brazilian developer Matheus Valadares in 2016.

In 2024, it was acquired by 3AM Experiences who then contracted out VexxusArts to update and maintain the game.

CEO Bill Karamousiz said they planned to rebuild the mobile app and add new game modes, achievements and cosmetics, among other improvements.

[7] Like other .io games, Diep.io features simple gameplay and graphics consisting of basic shapes.

[6] Some miscellaneous attributes like health, body damage, and size are increased with level.

Some unique tank classes can control drones, shoot missiles, or lay traps.

[6] Conversely, Simon Reed of Gamezebo opined that the early stages of gameplay were slow and the gameplay loop was not compelling enough to keep players after the first several playthroughs, unlike Agar.io and Slither.io, saying that Diep.io is "lacking in a few key departments that just hold it back from greatness."