# String.io vs Senpa.io

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.

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.

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.

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.

## The numbers

| Metric | String.io | Senpa.io |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (1.8K ratings)](https://appshunter.io/ios/app/stringio/id1243426580/reviews)** | [3.9 (171 ratings)](https://appshunter.io/ios/app/senpaio/id1423806009/reviews) |
| Number of ratings | **1.8K** | 171 |
| Positive reviews | **58.4% of reviews** | 58.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 months** | Every 9 months |
| Monetization | Subscription | **Free** |
| Size | 339 MB | 13 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Metajoy](https://appshunter.io/developer/1436156282) | [VexxusArts Ltd](https://appshunter.io/developer/1080798117) |

## What reviewers say

### String.io

[App page](https://appshunter.io/ios/app/stringio/id1243426580)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscribe For 1 Week | $7.99 | per 7 days |
| Subscribe For 1 Month | $19.99 | per month |
| Subscribe For 1 Year | $99.99 | per year |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

- Game freezes at 24% loading
- Missions not registering as completed
- Inconsistent collision detection

**Requested features**

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


### Senpa.io

[App page](https://appshunter.io/ios/app/senpaio/id1423806009)

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:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

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

**What reviewers complain about**

- 🤖 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

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*