12 457 online 4.8 · 12k+ reviews

War of Alliances

Xterium — Space MMOStrategy

Your empire. Your allies. Your war.

Grow your empire, build fleets and fight alliance wars — in the browser and on your phone with one account. Free, since 2013.

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Free — no credit card No download 30 seconds to play

Available on: BrowserNo install Google PlayAndroid App StoreiOS

12 457

players online

356

active alliances

ongoing wars

2 341

battles in 24h

Choose your path

Three distinct universes. Different play styles, one goal: dominance.

Recommended for beginners

War of Alliances

Flagship · PvE and content

The Xterium flagship: deep PvE, anomalies, contracts and the best onboarding.

The deepest PvE and auto-expeditions Anomalies and contracts — only here The best onboarding for beginners

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Classic

Fast classic

Fast classic: big numbers, a second galaxy and a hardcore fleet.

Fast classic, big numbers Global upgrade hub Second galaxy with bonus planets

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Season · 3 months

Reborn

Seasonal sprint

A seasonal 3-month sprint — even faster than Classic.

Seasonal server for 3 months Even faster than Classic New mechanics get tested here first

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Three factions. Three paths to empire.

Choose the side that defines your development style: power, resources or technology.

Grabtors

Conquerors

Attack, pressure and military might. For players who want to dominate through force.

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Talkors

Resource masters

Mining, production and steady growth. For players who build a solid foundation for their empire.

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Senteri

Keepers of knowledge

Research, recon and control. For players who win through technology.

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Compare factions

Guides · encyclopedia · mechanics

Xterium Knowledge Base

Everything you need to know before starting — from day one to advanced alliance war strategies.

All articles

27 articles

Guides

Practical instructions: first day, picking a universe, fleet save, economy, alliances.

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707 articles

Encyclopedia

Reference for game objects: ships, buildings, research, factions, resources.

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26 articles

Mechanics

Explanation of game systems: combat formulas, economy, alliance diplomacy.

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Xterium — Space MMO Strategy

Xterium — a free browser and mobile space MMO strategy in the 4X genre (eXplore, eXpand, eXploit, eXterminate). Players develop space empires, research technologies, build fleets, and join alliances to fight for galactic control.

The game is available in three universes with different balance and pace: War of Alliances — flagship with modern mechanics and active alliance wars, recommended for newcomers; Classic — original slow-paced universe for fans of classical strategy; Reborn — seasonal universe with fast pace and new mechanics.

Genre: 4X · MMO · Real-time strategy · Space
Platforms: Browser (Chrome, Firefox, Safari, Edge), Android, iOS
Model: Free-to-play, no mandatory payments
Universes: 3: War of Alliances, Classic, Reborn
Languages: 30 locales
Developer: Xterium Productions Inc.

Why play Xterium?

Deep strategy

Multi-layered economy, technology research, fleet construction and battle tactics. Every decision shapes alliance war outcomes.

Freedom of action

Diplomacy, trade agreements, espionage or open war — your call. Hundreds of active alliances coordinate attacks and hold galactic sectors.

Living world

Thousands of online players reshape the balance of power in real time. Every move is part of the galaxy's ongoing story.

Cross-platform

One account works in browser, on Android and iOS — progress syncs automatically. No download required, no mandatory app store registration.

Ongoing development

Regular updates, seasonal cycles in Reborn, new mechanics across all universes. Latest major update — "Alliance Forge".

How Xterium differs from other browser strategies

Xterium has its own niche among browser and space strategies. Compare key parameters — pick the one that fits your play style.

Game	Platforms	Genre	Free	Focus
Xterium	Browser · iOS · Android	4X / Space MMO	Yes	3 universes, alliance wars at the core
OGame	Browser	4X / Space	Yes (with premium)	Genre classic, individual progression focus
Star Trek Fleet Command	iOS · Android · PC	4X / Space strategy	Yes (in-app purchases)	Fleet command in the Star Trek universe, PvP battles and events
EVE Online	PC client	MMORPG / Space	Conditional (subscription)	Real-time, 3D client, deep economy and PvP

If you want a free browser-based space strategy with mobile apps and alliance wars at its core — Xterium fills that niche. OGame suits classic solo progression in the browser; Star Trek Fleet Command is space 4X with fleet command on mobile and PC; EVE Online is for those ready for a full 3D client with a subscription.

Detailed honest comparisons: Xterium vs OGame · vs Xcraft · vs DarkOrbit · All comparisons

Latest updates

Active discussions

Open forum

Frequently asked questions about Xterium

What is Xterium?

Xterium is a free browser and mobile space MMO strategy. Players develop empires, build fleets, join alliances and fight for galactic control. The game is available in three universes: War of Alliances, Classic and Reborn.

Is Xterium free?

Yes. Registration, access to all three universes, mobile apps and core gameplay are free. Premium features are optional and not required for progression.

What devices can I play on?

Xterium runs in any modern browser on Windows, macOS and Linux without installation. Native apps for Android and iOS are also available — progress syncs across devices.

Which universe is best for newcomers?

We recommend War of Alliances. It's the flagship universe with modern mechanics, active alliance wars and the most vibrant community. Classic suits those who want fast classic play with big loot numbers; Reborn is for seasonal games with new mechanics. Compare all three universes

How is Xterium different from other browser strategies?

Three key differences: (1) the core mechanic is global alliance wars, not isolated duels; (2) full native iOS and Android apps with browser sync; (3) three distinct universes for different play styles on one account.

How much time do I need to stay competitive?

Xterium is an asynchronous strategy. Battles and empire growth run in real time but don't require constant presence. 15-30 minutes per day is enough for steady growth; active players invest more during alliance wars.