# Blue Defense vs Circles JS

The clearest difference is in-app purchases: Circles JS at none against Blue Defense's 1. Circles JS also leads on update cadence (monthly vs every 3 months) and iOS requirement (9.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. Blue Defense sells 1 one-off in-app purchase. Circles JS asks for nothing beyond the download.

Blue Defense ships an update every 3 months, Circles JS monthly. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Blue Defense | Circles JS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (20 ratings)](https://appshunter.io/ios/app/blue-defense-second-wave/id389817492/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 81.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 11 MB |
| Requires iOS | 16.0 | **9.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Cat in a Box Software](https://appshunter.io/developer/1600179204) | [Gustav Fridell](https://appshunter.io/developer/996134339) |

## What reviewers say

### Blue Defense

[App page](https://appshunter.io/ios/app/blue-defense-second-wave/id389817492)

Defend your planet from alien invaders using a powerful cannon. Engage in intense arcade action with various game modes, leaderboards, and unlockable content. Enjoy updated retro graphics and flexible controls.

**Highlights:** Planet cannon for mass enemy destruction, Gauntlet mode to win the game, Infinite-Classic and Infinite-Quickstart modes, Level select with medal earning, 74 global leaderboards, Automatic save state, Multi-touch and tilt controls

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Content | $1.99 | one-time |


### Circles JS

[App page](https://appshunter.io/ios/app/circles-js/id1489091644)

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

**In-app purchases:** none


## Frequently asked questions

### Is Blue Defense free?

Blue Defense is free to download, with in-app purchases available.

### Is Circles JS free?

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

### Do Blue Defense or Circles JS have ads?

Neither Blue Defense nor Circles JS shows ads.

### Which is updated more often, Blue Defense or Circles JS?

Blue Defense ships an update every 3 months, and Circles JS monthly. Most recently, Blue Defense was updated on November 1, 2026 and Circles JS on October 29, 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.*