Best .io Apps & Games

249+ iOS apps & games curated and reviewed

4.4 avg rating
20 free apps & games
Updated September 2026

If you already know Agar.io, this is the deeper bench. 249+ .io apps and games for iPhone, all reviewed and ranked by user rating, recency, and download trend as of September 2026.

Compare top .io Apps & Games (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Agar.ioAgar.ioFree4.5★ (221K)YesYesSep 2026
2slither.ioslither.ioFree3.8★ (3K)NoYesSep 2026
3Survivor!.ioSurvivor!.ioFree4.7★ (244K)NoYesSep 2026
4diep.iodiep.ioFree3.8★ (20K)YesNoSep 2026
5Paper.io 2Paper.io 2Free4.5★ (2.9M)YesYesSep 2026
6State.io - Conquer the WorldState.io - Conquer the WorldFree4.6★ (249K)YesYesSep 2026
7Hole.ioHole.ioFree4.6★ (2M)YesYesSep 2026
8Fish Eater.ioFish Eater.ioFree4.8★ (59K)YesYesSep 2026

Top Picks for .io

Agar.io#1

Agar.io by Miniclip.com

Play with friends online
Editor's Choice
🎮 Games
4.5😐(221K ratings)
FreeAdsIn-App Purchases
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Grow your cell by consuming smaller cells and avoiding larger ones in this online multiplayer game. Master tactics like splitting and dodging to become the biggest cell. Unlock secret skins with special usernames.

What We Love

  • 🚀 Addictive gameplay
  • 🔥 Iconic game
  • 💎 Great rewards system
  • 🎨 Customizable skins

Room to Improve

  • 🔍 Difficulty for new players
  • 🕰️ Slow progression
  • 💰 Excessive ads and microtransactions
  • 🔒 Lack of account portability
  • 🐛 Frequent crashes and lag
  • 🕹️ Unbalanced gameplay (teamers, macros)
slither.io#2

slither.io by Lowtech Studios LLC

Multiplayer slither game
Strong Contender
🎮 Games
3.8😐(3K ratings)
FreeIn-App Purchases
#43in Games
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Compete against other players in a multiplayer game where you grow by consuming the remains of defeated opponents. Outmaneuver larger players to win and become the longest slither.

What We Love

  • 🚀 Addictive gameplay
  • 👍 Customizable snake skins
  • 🚀 Offline mode available
  • 👍 No ads (if paid)

Room to Improve

  • 🐛 Frequent lags and freezes
  • 🐛 Glitches causing unfair deaths
  • 🐛 Inability to control snake movements
  • 🐛 Inappropriate player names
  • 💰 Ads and in-app purchases
Survivor!.io#3

Survivor!.io by HABBY

Survive the fun!
Worth Considering
🎮 Games
4.7😊(244K ratings)
FreeIn-App Purchases
#21in Games
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Battle hordes of zombies as a heroic warrior with unlimited potential. Survive overwhelming odds with one-hand controls and unlimited skill combinations. Face over 1000 monsters at once and clear challenging maps.

What We Love

  • 🚀 No forced ads
  • 👍 Fun and addictive gameplay
  • 💡 Accurate to the ads
  • 🚀 No pay-to-win mechanics
  • 👍 Generous rewards for free players
  • 👍 Smooth graphics and performance

Room to Improve

  • 🐛 Crashes and freezes
  • 🔍 Lack of transparency in difficulty scaling
  • 🔍 Unbalanced boss encounters
  • 🔍 Repetitive level design
  • 🔍 Overwhelming screen clutter
  • 🔍 Unsatisfactory progression system

More .io apps to explore

FAQ about .io

What are the best .io apps & games for iPhone?
Agar.io tops our .io apps & games ranking as of September 2026, with a 4.5-star average from 221K App Store ratings, and it's free to download.
Yes — 20 of the top .io apps & games we rank are free to download, including Agar.io and slither.io.
Agar.io shows ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 249+ .io apps & games on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
Agar.io is an online multiplayer game where players control a cell and aim to grow larger by consuming smaller cells. The objective is to survive and become the biggest cell in the game by strategically eating other players while avoiding those larger than you.
You control your cell using touchscreen controls designed for mobile devices. Eat smaller cells to grow, and use tactics like splitting and dodging to catch other players or escape danger. The game is played online with players from around the world.

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