Skip to main content

Agar.io

Be a cell, eat smaller cells, flee larger ones and split to ambush. The game that invented this entire genre in 2015.

Opens in a new tab. We do not control this site and it may have changed since we catalogued it.

How to get the most from it

Agar.io sits in .io Arenas under Play, filed as instant.

  • Just open it. It pays off within seconds, with nothing to read first.
  • It works on a phone or a desktop, so open it on whatever is nearest.
  • It works with the sound off, so it is fine on a train or in a quiet office.
  • No account needed — you can start without signing up.
  • Go in expecting something competitive and chaotic.

About this category: Open a tab, get dropped into a live match with strangers, die embarrassingly fast, immediately respawn. The purest loop the browser ever produced.

Good for

  • A five-second distraction
  • Chasing a better score
  • Pure, noisy chaos
  • A quiet break at your desk
  • Killing time on your phone
  • Trying it with zero commitment

Agar.io: quick answers

Is Agar.io free?

Yes. Agar.io is free to use and needs no account.

Do I need an account to use Agar.io?

No. You can use Agar.io without signing up for anything.

Does Agar.io work on a phone?

Yes. Agar.io works on phones as well as desktop browsers.

Is Agar.io safe for work?

Yes, we file it as safe for work. It also works muted.

How long does Agar.io take?

We file it as "Instant": Good within five seconds of loading.

More in .io Arenas

All 14 in .io Arenas
  • Browser Minecraft with party modes bolted on — parkour, bed wars, one-block survival — and multiplayer that joins in one click.

  • Physics sumo where everybody is a circle, the only verb is shove, and the arena keeps getting smaller until someone falls off.

    • <1 min
    • Desktop
  • Start as a shrimp, eat, evolve into something with teeth, and repeat in an ocean full of players doing exactly the same thing.

  • A tank shooting polygons for experience, then branching down a surprisingly deep upgrade tree, from the maker of Agar.io.

    • <1 min
    • Desktop

Same mood: competitive

All competitive sites
  • Click targets as they pop up and get scored in targets per second. Shooter players use it to warm up before a session.

  • Buy aircraft, plot routes and slowly discover that fuel price is the only variable that ever really mattered.

  • Backgammon against ranked humans, with an analysis pass afterwards that quantifies precisely how reckless your doubles were.

  • One song revealed a single instrument at a time, six guesses, one puzzle a day. Needs headphones and a decent musical memory.

Keep exploring

Have a site of your own? Suggest it for Detour or browse the AltFTool backlinks hub.