Games like Sub Chase Online
Games like Sub Chase Online include Hearts of Iron IV, Counter-Strike 2, Arma 3, UBOAT, and World of Warships. We matched them by the tags players give Sub Chase Online on Steam (Naval Combat, Team-Based, World War II, Simulation, and Multiplayer): closest matches first, and among equally close ones the better-known games.

Hearts of Iron IV
Shared: World War II · Strategy · Multiplayer

Counter-Strike 2
Shared: Multiplayer · Team-Based · First-Person

Arma 3
Shared: Multiplayer · Simulation · Realistic

UBOAT
Shared: World War II · Naval Combat · Simulation

World of Warships
Shared: Naval Combat · Multiplayer · 3D

Squad
Shared: Realistic · Multiplayer · Military

Hell Let Loose
Shared: World War II · Realistic · Multiplayer

Squad 44
Shared: World War II · Simulation · Multiplayer

Insurgency
Shared: Realistic · Multiplayer · Team-Based

Bodycam
Shared: Realistic · Multiplayer · Simulation

Men of War: Assault Squad 2
Shared: World War II · Strategy · Simulation

Red Orchestra 2: Heroes of Stalingrad with Rising Storm
Shared: World War II · Realistic · Multiplayer

Arma Reforger
Shared: Simulation · Realistic · Multiplayer

War Thunder
Shared: Simulation · World War II · Naval Combat

Tom Clancy's Rainbow Six Siege
Shared: Multiplayer · Team-Based · Strategy

Arma 2: Operation Arrowhead
Shared: Simulation · Multiplayer · Realistic

Wolfpack
Shared: Naval Combat · Simulation · World War II

Company of Heroes 2
Shared: World War II · Strategy · Multiplayer

Day of Infamy
Shared: World War II · Multiplayer · Realistic

WARDOGS
Shared: Multiplayer · Realistic · Military

Easy Red 2
Shared: World War II · Team-Based · First-Person

Silent Hunter® III
Shared: Naval Combat · Simulation · World War II

War on the Sea
Shared: Naval Combat · World War II · Simulation

Enlisted
Shared: World War II · Multiplayer · Team-Based