Colonize
Claim your homeworld, then expand across solar systems. Every planet's position, temperature, and fields shape what it can become. Pick your colonies like you mean it.
SFC2
Sign In
// Incoming transmission: all commanders
Build an empire.
Command the galaxy.
SFC2 is a free, persistent space-strategy MMO that runs in your browser. Colonize planets, research technology, and wage real-time fleet warfare against real players. The universe keeps moving even while you sleep.
- ✦ Free to play
- ✦ Plays in your browser, no download
- ✦ New-commander protection while you learn
Live operations
- 434
- Commanders active this week
- 812
- Fleet missions under way right now
- 5,525
- Worlds under player control
How you conquer
Four systems, one loop. Everything you build feeds the next war.
Build & Research
Raise mines, power grids, and shipyards, then push a deep tech tree that unlocks new hulls, defenses, and abilities. Your economy is your first weapon.
Command Fleets
Dispatch fleets on real-time missions: attack, raid, transport, colonize, defend. Travel time is real, and so are ambushes. Check your scanners before you sleep.
Forge Alliances
Join an alliance, coordinate group attacks, declare wars, and hold territory together. The galaxy is too big and too hostile to rule alone.
// From the original developer
Starfleet Commander is back
SFC2 is the rebirth of Starfleet Commander, the browser space MMO from the 2000s, rebuilt from the ground up by its original developer. Same depth, same all-night fleet math, modern engine, plays on your phone.
Flew fleets in the original? Your old rivals are already here. Welcome back, Commander.
Deep where it counts
Espionage
Probe enemy planets, read their fleets, and strike where the books say they're weak.
Moons & debris
Battles leave debris fields worth harvesting, and sometimes a moon worth keeping.
Missions & encounters
Hunt NPC encounters and run missions when you want a fight the galaxy didn't pick for you.
Trade & economy
Move resources between worlds, trade with other commanders, and bankroll your wars.
Wars & rankings
Formal alliance wars, leaderboards, and battle reports that name names.
Player-built wiki
Formulas, build orders, and combat math, all documented in the open. Read the wiki →