Browser space MMO and strategy games
The two halves of the genre, the four questions that separate them, and where Swarm MMO sits.
Space strategy in a browser covers two fairly different kinds of game, and most of what people mean by "a game like the one I used to play" comes down to which of the two they mean.
Two kinds of game
Tick-based empire builders. You hold a planet, queue buildings, wait for a mine to finish, and send fleets that arrive hours later. OGame is the reference point and most of the genre keeps its shape: several resources, a research tree, a build queue, an alliance to coordinate with. A session is a few minutes of setting queues, and the waiting happens whether or not you are watching.
Real-time territory games. You drag units from one planet to another and the fight resolves on arrival, in seconds. Galcon is the reference point. Production is automatic, there is no queue, and the only decision is where to send what you already have. A session lasts as long as the match does.
Swarm MMO is the second shape running on the first shape's clock. Probes are the only resource and dragging is the only order you give, but the galaxy is persistent and shared: every swarm crosses a map other people are fighting over at the same time, which is what makes it a space MMO rather than a self-contained match.
Four questions worth asking
Screenshots in this genre all look alike. These are the differences that change how a game actually plays.
Does it run while you are away? In Swarm MMO a planet at level L produces L probes a minute whether you are connected or not, up to level 10, and nothing decays. A planet can sit on a stockpile for a week. The same is true of everyone else's planets, so coming back to a smaller empire than you left is an ordinary outcome rather than a bug.
Can you buy strength? Credits buy skins, colours and the Command Center panel, which starts at 10 credits for a single day, or 150 credits for 30 days. They never buy probes, production or combat strength. Meteorites pay 1 credits and the three starting quests pay 10 each, so the currency is reachable without spending anything.
Does it end? Plenty of browser strategy games run in rounds and wipe everyone at the end of each one. Swarm MMO has no rounds. It has a win condition: hold every sun in a galaxy, capture the black hole at its core, stockpile 1,000 megaprobes on it, and collapse it. The collapse destroys that galaxy, your own planets included, and permanently raises the energy every sun you own produces afterwards. A galaxy can also end on its own: an ungarrisoned black hole goes unstable at day 14 and eventually collapses it with nobody paid.
Does it work on a phone? Dragging, box-select and the radial menus were built for a touchscreen as well as a mouse, and the site can be added to a home screen as a Progressive Web App. There is no separate mobile version to be behind the desktop one.
Where the numbers live
Every figure on this page comes out of the game's own constants. The wiki documents the rest of them: production and upgrade costs on Planets, how a fight resolves on Attacking, and the full path to a collapse on Black Holes.
If you played something else
Questions
What is the best browser space strategy game?
There is no single answer, because the genre splits into slow empire builders and fast territory games and those suit different people. If you want queues, research and fleets that take hours, the OGame family is what you are after. If you want to give one kind of order and see it resolve in seconds, Swarm MMO or Galcon is closer. The OGame comparison spells out the difference.
Are browser strategy games always pay-to-win?
Many are, in the specific sense that money buys production or build speed. It is worth checking what a game's currency actually does before investing time. In Swarm MMO credits buy cosmetics and one interface panel, and nothing that affects a fight.
Do I need to install anything to play Swarm MMO?
No. It runs in any modern browser on desktop or mobile, and you spawn as a guest without an account. Linking an email keeps your progress across devices.
How long does a session take?
As long as you want. Sending a swarm and watching it land takes under a minute, and automation can hold an empire together between sessions. The endgame is measured in days, not minutes.
Guides
The wiki documents every mechanic with the numbers the code uses. All topics.