No—Survival Log is single-player
The Steam store lists Single-player, Steam Achievements, Steam Cloud and Family Sharing. None of those features turns the game into co-op.
Why multiplayer is not planned
The official launch FAQ explains that actions are queued for one survivor. Multiplayer would require several simultaneous queues and a redesign of time progression, action resolution and event triggers. The team prefers to spend that work on a deeper single-player experience.
Survivor interactions are not other players
You can rescue a neighbor, send supplies across rooftops, trade by drone and communicate through in-game systems. These are story and management mechanics involving game characters, not live connections to another player.
Steam features explained
- Steam Cloud: synchronizes supported save data.
- Family Sharing: eligible accounts can share library access under Steam's rules.
- Achievements: track individual progress.
- Single-player: the only listed gameplay category.
Where to watch for a change
Follow the official Steam announcements and Discord. Unless the developer publishes a new plan and the Steam feature list changes, the accurate answer remains single-player only.