# Defender III vs Brainsyn

The clearest difference is rating: Brainsyn at 5.0 against Defender III's 4.5. Brainsyn also leads on in-app purchases (none vs 11) and ads (none vs shown). Defender III's advantage is ratings volume (5.2K vs 4) and iOS requirement (12.0 vs 17.0). On price and device support there is nothing between them.

Both are free to download. Defender III sells 11 one-off in-app purchases. Brainsyn asks for nothing beyond the download.

Brainsyn holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Defender III has 5.2K ratings behind it against 4, so its average is the more settled of the two.

Defender III ships an update every 6 weeks, Brainsyn every 4 days. The most recent releases landed on October 29, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Defender III | Brainsyn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (5.2K ratings)](https://appshunter.io/ios/app/defender-iii/id1131557212/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/brainsyn/id6752514565/reviews)** |
| Number of ratings | **5.2K** | 4 |
| Positive reviews | 69.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 116 MB | 19 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [DROIDHEN LIMITED](https://appshunter.io/developer/550081854) | [Voyager](https://appshunter.io/developer/955893409) |

## What reviewers say

### Defender III

[App page](https://appshunter.io/ios/app/defender-iii/id1131557212)

Lead your warriors and defend your kingdom from a dark dragon army in this epic tower defense game. Explore over 500 levels, master 4 elements, and upgrade your weapons and magic to defeat powerful bosses and evil magic.

**Highlights:** Over 500 levels, Explore 4 elements (Wind, Water, Earth, Fire), More than 50 skills to explore, Forge weapons and upgrade towers, More than 40 magical powers, Defeat epic monsters and bosses

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 20 Crystals | $1.99 | one-time |
| 20 Crystals + EXTRA | $1.99 | one-time |
| 60 Crystals | $4.99 | one-time |
| 60 Crystals + EXTRA | $4.99 | one-time |
| 210000 Coins + EXTRA | $9.99 | one-time |
| Festival Pack B | $9.99 | one-time |
| Tower Pack | $9.99 | one-time |
| Crate of Coins + EXTRA | $9.99 | one-time |
| 200 Crystals | $14.99 | one-time |
| 200 Crystals + EXTRA | $14.99 | one-time |
| Sylph + Gnome + Undine + Salamander | $19.99 | one-time |

**What reviewers like**

- 👍 Great game
- 🚀 Addictive gameplay
- 💎 Decent free-to-play model
- 🎨 Good graphics and visuals
- ⏱️ Fun way to pass time

**What reviewers complain about**

- 🐛 Crashes and bugs
- 💰 Expensive in-app purchases
- 🕰️ Slow progression without spending
- 🤖 Repetitive gameplay
- 🎮 Controls/UI issues

**Reported bugs**

- Battle mode crashes frequently
- Inconsistent reward delivery
- Spinning wheel not working as intended
- Sync issues after device changes
- Graphical glitches on some devices

**Requested features**

- Add more enemy/level variety
- Improve World Raid mode
- Implement level select option
- Optimize for newer devices
- Add more ways to earn premium currency


### Brainsyn

[App page](https://appshunter.io/ios/app/brainsyn/id6752514565)

Engage in a variety of fun and challenging mini-games designed to test and improve your speed, focus, and memory. Track your progress and make brain training an entertaining daily habit.

**Highlights:** Cognitive skill mini-games, Tests speed, focus, and memory, Tracks skill improvement, Entertaining daily habit, Modern and clean design

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Defender III free?

Defender III is free to download, with in-app purchases available.

### Is Brainsyn free?

Brainsyn is free to download, with no in-app purchases.

### Which has better reviews, Defender III or Brainsyn?

Brainsyn is rated higher. Defender III averages 4.5 out of 5 from 5.2K ratings, while Brainsyn averages 5.0 from 4 ratings.

### Do Defender III or Brainsyn have ads?

Defender III shows ads; Brainsyn does not.

### Which is updated more often, Defender III or Brainsyn?

Defender III ships an update every 6 weeks, and Brainsyn every 4 days. Most recently, Defender III was updated on October 29, 2026 and Brainsyn on October 11, 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.*