The agar.io private servers worth playing in 2026 are alis.io, Sigmally, Gota.io, Senpa.io, Agma.io and Cytos.io. All six are free and run in the browser. They differ in what they add on top of classic agar rules: custom gamemodes and map making, skins and events, instant-merge physics, MMO-style progression, or a competitive scene.
Full disclosure: alis.io is our own game, so read that entry knowing who wrote it. Every other server here is listed on its merits, with what it is genuinely best at. Most lists in this niche are three links and a wall of ads; this one is the comparison we wished existed.
Ours, and the only server on this list where players make the content. A visual map maker and gamemode editor let anyone tune physics, draw walls and pellet zones, and publish the result as a free hosted private server with an invite link. Macros, multibox, free zoom, custom image skins and instant replays are built into the game rather than added by mods, and the client is a modern Rust and WebGPU build that stays smooth with hundreds of cells. The trade-off of being new: the player base is the smallest on this list.
Best for: making your own gamemodes and maps, and private games with friends.
The private server you will see most often in search results in 2026. Classic agar gameplay in the browser with skins, events and a large Discord community around it.
Best for: drop-in classic agar with an active player base.
One of the longest-running private servers, live since the mid-2010s, with party rooms, its own skins gallery and an established competitive scene.
Best for: competitive free-for-all and party play with friends.
Built its name on modded physics: instant-merge and self-feed style servers are its signature, and its community expects that faster pace.
Best for: instant-merge fans.
Layers MMO-style progression on top of agar gameplay: coins, shop items, pets and a gold membership. More to grind if plain FFA gets old.
Best for: progression and collecting on top of agar.
The successor to vanis.io. Light on website, heavy on community: a competitive crowd that mostly organizes through its Discord.
Best for: experienced players looking for sweaty lobbies.
What is an agar.io private server?
An agar.io private server is an independent, fan-built server or standalone game that plays like agar.io but is not operated by Miniclip. Private servers exist to change the recipe: faster or modded physics like instant merge, custom skins and themes, macros and multibox allowed by design, new gamemodes, or private rooms where only invited friends can join.
When picking one, check three things: whether it still has players, whether the features you care about, like macros or multibox, are built in or against the rules, and whether you can go beyond playing, by hosting a server or creating a mode of your own.
Common questions
- Are agar.io private servers free?
- Yes. Every server on this list is free to play in the browser with no download. Several sell optional cosmetics or memberships, but the games themselves are free.
- Can I make my own agar.io private server in 2026?
- Yes, but not the old way. The open-source server projects people used to self-host, like Ogar and MultiOgar, are archived or dormant. The practical route in 2026 is a hosted one: on alis.io you publish a gamemode and get a free hosted private server with an invite link, no hardware or setup.
- Which agar.io private server has instant merge?
- Senpa.io made instant merge its specialty. alis.io ships an official insta-merge mode as well, and its editor lets you tune merge timing into any custom mode you publish.
- Is agar.io itself still online?
- Yes, agar.io still runs at agar.io, operated by Miniclip. Private servers are separate games and none of the sites on this list, including this one, are affiliated with Miniclip.