How many people own Zero-K?

500,000–1,000,000. Estimated band from SteamSpy, not a sales figure.

Player counts

How many people play Zero-K?

105

Playing right now

Zero-K (ZK; formerly known as Complete Annihilation and CA) is a free multi-platform open source real-time strategy computer game. Initially based on content from Total Annihilation on the open source Spring Engine, it was forked and all proprietary content replaced, and evolved into a completely new game with unique features. Among the games powered by the Spring game engine, Zero-K is particularly notable for its extensive use of Lua scripting for interface and gameplay changes/enhancements, as well as unique RTS concepts such as a flat technology tree.

We have been measuring Zero-K hourly since 8 August 2026. We do not backfill numbers from before that.

Playing right now: 105
Peak since we started tracking: 186
Estimated owners: 500,000–1,000,000 est.

Estimated band from SteamSpy, not a sales figure.

Questions and answers

How many people play Zero-K?: 105 (playing right now)
What is the peak player count for Zero-K?: 186
How many people own Zero-K?: 500,000–1,000,000. Estimated band from SteamSpy, not a sales figure.

Zero-K