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BROWSER SPACE MMO

Space strategy in browser

Xterium is a browser MMO about empire growth, fleets and alliance wars. No downloads, no installs. Open a tab and play.

Why play in browser

Browser play is not a compromise — it's an advantage. Six reasons.

No installs

Open xterium.com — play. No 5-gigabyte client, no long updates. Every update goes automatically to your browser.

Any OS, any PC

Windows, macOS, Linux, Chromebook — anywhere Chrome or Firefox runs. Works on office PCs, netbooks, old laptops.

Safe

Browser isolates the game in a sandbox. No access to files, registry, system core. All data — on Xterium servers.

Fast start

Registration — 30 seconds. Universe selection — 10 more. First planet builds in a minute. No 5-minute loading screens.

Cross-device

Played on PC — continue on laptop. From browser — to mobile app. Progress in cloud, everything syncs.

Full MMO

Browser doesn't mean simplified. Thousands of players, real alliance wars, deep economy, diplomacy. Everything you expect from MMO.

Which universe to pick

All three universes on one account. Browser version works equally well in each.

War of Alliances

Flagship. Active alliance wars, recommended for newcomers.

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Classic

Classic pace, strong economy. For genre veterans.

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Reborn

Seasonal universe, x2-x5 speeds, fresh every 3-6 months.

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Frequently asked questions about browser play

Do I need to download anything?
No. Xterium is fully browser-based: any modern browser on Windows, macOS or Linux. No clients, launchers, updates.
Which browser is recommended?
Chrome, Firefox, Edge, Safari or Yandex — all current versions work. We recommend Chrome for maximum performance on big galaxies.
How many resources does the game consume?
Xterium browser tab uses 100-300 MB RAM, like an ordinary modern site. CPU load is minimal — optimized for old PCs and netbooks.
Can I play from phone via browser?
Yes, mobile browser also works. But we recommend native apps: they're faster, have push notifications and better UI. See <a href="/en/mobile">Mobile version</a>.
Does progress save?
Yes, everything in the cloud. Closed tab, opened from another PC — continue from there. Progress between browser and mobile app syncs automatically.

Start right now

Registration — 30 seconds. Your browser is already open. Game starts instantly.

Play free Choose universe