Comparison

String.io vs Senpa.io

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

String.io

Capture territory by enclosing areas with your string. Attack opponents by hitting their tails. Unlock avatars and enjoy minimalist graphics in this competitive .io game.

Highlights
  • Enclose areas to capture territory
  • Attack players by hitting tails
  • Unlock over 30 avatars
  • Minimalist graphics
  • Multiple control methods
Features
Read full description

String.io is a brand new IO game! The goal is pretty simple. Just capture as much territory as possible! Take care! Your enemies are extremely smart! HOW TO PLAY ● Enclose an area with your string to capture new land. ● Attack other players by hitting their tails. FEATURES ● Over 30 colorful avatar to unlock ● Amazing minimalism graphics ● Up to 4 control methods to choose ● Online PVP coming soon Join this game and beat people all around the world! STRING.IO UNLIMITED SUBSCRIPTION: - The subscriptions are $7.99 weekly with 3 days FREE trial, $19.99 monthly, $99.99 annually. - During your subscriptions, you can get 10000 coins per day and double coins. - You can skip missions for the duration of your subscription. - Payment will be charged to iTunes Account at confirmation of purchase. - Subscription automatically renews unless auto-renew is turned off at leat 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period at the cost of the chosen subscription. - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. - No cancelation of the current subscription is allowed during active subscription period. - You can read privacy policy at http://www.metajoy.io/privacy.html and terms of use at http://www.metajoy.io/privacy.html - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that content. *Prices are equal to the value that "Apple's App Store Matrix" determines is the equivalent of the subscription price in$USD. Terms of Service http://www.metajoy.io/privacy.html Privacy Policy http://www.metajoy.io/privacy.html Questions? Ask: help@metajoy.io

About

Senpa.io

Control a tiny cell and eat other players to grow larger in this online multiplayer game. Survive and strategize using splitting, shrinking, and dodging tactics to become the biggest cell. Discover secret skins with special usernames.

Highlights
  • Online multiplayer gameplay
  • Eat smaller cells to grow
  • Splitting and shrinking tactics
  • Dodging mechanics
  • Special secret skins
  • Touchscreen controls
Features
Read full description

The browser game phenomenon comes to iOS! Play online with players around the world as you try to become the biggest cell of them all! Senpa.io is an addictive app made by the same people who play Agar.io ! Control your tiny cell and eat other players to grow larger! But watch out: players bigger than you will be trying to make you their lunch. Survive and eat long enough to become the biggest cell in the game! With new controls developed especially for touchscreens, Senpa.io offers the same addictive gameplay that millions have already enjoyed on PC. Play online in free-for-all action and use splitting, shrinking and dodging tactics to catch other players - or avoid them! Use a variety of special secret skins with the right username! Terms and Conditions: https://senpa.io/web/terms.txt Privacy Policy: https://senpa.io/web/privacy.txt

Screenshots

String.io4 screens
Senpa.io3 screens

Verdict

The call

The clearest difference is rating: String.io at 4.5 against Senpa.io's 3.9. String.io also leads on update cadence (every 3 months vs every 9 months) and ratings volume (1.8K vs 171). Senpa.io's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, review sentiment and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. String.io sells 4 in-app purchases, starting at $7.99 per 7 days. Senpa.io asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

String.io holds the better App Store score, 4.5 against 3.9. That said, the two scores are not equally well evidenced: String.io has 1.8K ratings behind it against 171, so its average is the more settled of the two. Written reviews split almost evenly too, at 58% and 58% positive.

UpkeepUpdate frequency

String.io ships an update every 3 months, Senpa.io every 9 months. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.

Scorecard7 real differences · 3 level
String.io versus Senpa.io: the parameters behind the verdict, then further details
ParameterString.ioSenpa.io
PriceFreeFree
Rating4.5 (1.8K ratings) — better3.9 (171 ratings)
Positive reviews58.4% of reviews — better58.2% of reviews
Number of ratings1.8K — better171
Update frequencyEvery 3 months — betterEvery 9 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationSubscriptionFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size339 MB13 MB
Age rating4+4+
DeveloperMetajoyVexxusArts Ltd

Customer experience

String.io

All ratings1,776 ratings
Positive88.2%
Neutral4.8%
Negative7.0%
Written reviews510 reviews
Positive58.4%
Neutral7.1%
Negative34.5%

Senpa.io

All ratings171 ratings
Positive71.9%
Neutral5.3%
Negative22.8%
Written reviews79 reviews
Positive58.2%
Neutral12.7%
Negative29.1%

User reviews

String.io

From 1.8K App Store ratings

What we love

  • 🚀 Fast and addictive gameplay
  • 👍 Variety of skins and characters
  • 💡 Creative game concept
  • 🎨 Colorful and visually appealing

Room to improve

  • 🔍 Opponents are AI, not real players
  • 💰 Expensive in-app purchases for skins
  • 📢 Excessive ads and ad interruptions
  • 🐛 Occasional crashes and glitches

Senpa.io

From 171 App Store ratings

What we love

  • 🎮 Engaging and addictive gameplay
  • 😊 Fun and enjoyable experience
  • 🚀 Smooth performance when working properly
  • 🎯 Good game mechanics similar to Agar.io

Room to improve

  • 🤖 Overpowered bots with unrealistic AI
  • 🐌 Severe lag and freezing issues
  • 🔌 Frequent loading and connection problems
  • 📱 UI/button sizing and positioning issues
  • 🎨 Skin system broken and non-functional

Bugs and requests

String.io

Reported bugs

3 issues
  • Game freezes at 24% loading
  • Missions not registering as completed
  • Inconsistent collision detection

Requested features

4 requests
  • Online multiplayer mode
  • Ability to play with friends
  • More levels and game modes
  • Improved mission system

Senpa.io

Reported bugs

13 issues
  • Bots spawn with skins while players cannot use them
  • Skin upload system shows 'pending' then disappears
  • Custom skin creation disabled
  • Game won't load or freezes on startup
  • Login fails with 'no internet connection' error
Show 8 more
  • Discord/Facebook authentication not working
  • Character randomly feeds in duel mode
  • Self-feed area causes complete freeze
  • Screen/portrait orientation incorrect on iPhone
  • Joystick controls inverted or unresponsive
  • White screen appears after entering game
  • Button size settings not saving after reload
  • Game crashes during high-mass gameplay

Requested features

10 requests
  • Multiple macro speed options and settings
  • Customizable button positioning and sizing
  • Tap-to-move control option
  • Private/custom servers for skill practice
  • Chat system and friend list functionality
Show 5 more
  • Account levels and progression system
  • Better skin upload and management system
  • Improved zoom controls for self-feed mode
  • More server capacity
  • Spectate feature restoration

In-app purchases

4 purchases

String.io

Subscriptions3
  • Subscribe For 1 Week3 Days trial$7.997 Days
  • Subscribe For 1 Month$19.991 Month
  • Subscribe For 1 Year$99.991 Year
One-time1
  • Remove Ads$1.99
None

Senpa.io

No in-app purchases

Questions

Is String.io free?
String.io is free to download, with in-app purchases available.
Is Senpa.io free?
Senpa.io is free to download, with no in-app purchases.
Which has better reviews, String.io or Senpa.io?
String.io is rated higher. String.io averages 4.5 out of 5 from 1.8K ratings, while Senpa.io averages 3.9 from 171 ratings.
Do String.io or Senpa.io have ads?
String.io shows ads; Senpa.io does not.
Which is updated more often, String.io or Senpa.io?
String.io ships an update every 3 months, and Senpa.io every 9 months. Most recently, String.io was updated on October 16, 2026 and Senpa.io on October 14, 2026.

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