Agar.io vs Slither.io: Which One Should You Play?
These are the two games that made the .io genre famous worldwide. Agar.io came out in 2015, Slither.io the year after, and both make the same promise: a browser, a mouse, and a match that starts in three seconds. Yet they play nothing alike. Here's a side-by-side comparison to find out which one suits you.
The idea in one sentence
- Agar.io: you're a cell. You eat smaller cells and run from bigger ones.
- Slither.io: you're a snake. You grow by eating glowing dots, and an opponent dies if their head touches your body.
That's a fundamental difference. In Agar.io, size decides who eats whom. In Slither.io, even a tiny snake can take down a giant by being in the right place.
Controls
Both games use the mouse, with two key actions each:
- Agar.io: Space to split (and launch half of yourself at prey), W to eject mass (feed a teammate or bait someone).
- Slither.io: hold click to boost, at the cost of a bit of your length.
Slither.io is a little more immediate: you get everything in one match. Agar.io hides more subtlety behind splitting, and it takes a few hours to master. Our Agar.io and Slither.io guides cover the basics in detail.
Strategic depth
Agar.io is a game of timing and math. Splitting at the right moment, avoiding viruses (the green spiky cells that burst big cells), using the map edges: every decision can wipe out minutes of progress at once.
Slither.io is a game of positioning and nerves. The circling technique, boosting to cut someone off, handling the crowd around the remains of a big snake: everything happens in a split second.
To go further, we've gathered our best advice in Agar.io tips and Slither.io tips.
The feel of a match
- Agar.io is often tense and slow: you grow, you become a target, and everyone waits for your mistake.
- Slither.io is more chaotic and colorful: comebacks happen all the time, and a top 1 can fall to a single moment of inattention.
Both games show a leaderboard at the top of the screen. That's the real engine of replayability: "one more, I can make the top 10".
On mobile
Both exist as mobile apps on top of the browser version. Slither.io plays especially well with a finger, since it only needs a direction and one button. Agar.io works too, but precise splitting is harder without a keyboard.
The verdict
Pick Agar.io if you like patient strategy, size calculations and bold plays set up in advance.
Pick Slither.io if you want instant action, short matches and spectacular comebacks.
Love both? You probably need a game that adds progression to the formula. That's what evolution-based .io games do, like Diep.io or Dovion: you level up during the match, unlock a new ship and a special ability, and your playstyle changes as you go. We compare them in Dovion vs Agar.io and Dovion vs Slither.io.
What's next?
The genre is huge. Our history of .io games tells how these two titles started the wave, and our list of games like Agar.io will keep you busy.
Fancy an .io battle on the high seas, with cannons and bosses? Play Dovion for free, no download and no account.