# Kepler Attack vs Cube Flex Full

The clearest difference is in-app purchases: Kepler Attack at none against Cube Flex Full's 1. Kepler Attack also leads on update cadence (every 2 months vs every 21 months) and chart position (#26 vs unranked). Cube Flex Full's advantage is price ($0.99 vs $1.99) and iOS requirement (15.6 vs 17.0). On ads and device support there is nothing between them.

Kepler Attack costs $1.99 and Cube Flex Full $0.99 up front. Cube Flex Full sells 1 one-off in-app purchase. Kepler Attack asks for nothing beyond the download.

Kepler Attack ships an update every 2 months, Cube Flex Full every 21 months. The most recent releases landed on October 13, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | Kepler Attack | Cube Flex Full |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| Rating | **[4.5 (942 ratings)](https://appshunter.io/ios/app/kepler-attack-watch-game/id1441234645/reviews)** | — |
| Number of ratings | **942** | — |
| Positive reviews | 81.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 21 months |
| Monetization | Paid | — |
| Best chart rank | **#26** | — |
| Size | 17 MB | 43 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Red Sprite Studios](https://appshunter.io/developer/493770851) | [Danila Dorokhov](https://appshunter.io/developer/1496880462) |

## What reviewers say

### Kepler Attack

[App page](https://appshunter.io/ios/app/kepler-attack-watch-game/id1441234645)

**Currently charting:** #26 Top Paid · Casual, #73 Top Paid · Action (US App Store)

Engage in a retro arcade space shooter experience on your iPhone and Apple Watch. Destroy waves of alien invaders with power-ups and intuitive controls. Enjoy fast-paced gameplay perfect for short bursts of fun.

**Highlights:** Space shooter gameplay, Alien invasion waves, Power-ups (Shield, Triple Shot, etc.), Apple Watch Crown controls, iPhone swipe controls, Retro arcade graphics, Short burst gameplay

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 😁 Great for apple watches
- 🎮 An actual video game
- 🎶 What's the music called?
- 📱 I love the fact that you can play this game on an Apple Watch
- ⏱️ Old School Arcade Immediacy and Brevity

**What reviewers complain about**

- 🙄 Not worth paying for
- 💰 Ain't worth the money really
- 🙄 Fun but basic
- 😒 Stupid forced reviews
- 🐛 Won't install

**Reported bugs**

- Game doesn't play complete rip off
- Just says on the watch version that it has to be installed on my iPhone for it to work. It's installed on my iPhone. Doesn't work.
- This seems like a good game but I don't see it on my watch.
- I have the first version watch Apple one, and it does not work on the watch,And has offered me a refund, I appreciate it.
- It won't download on my watch

**Requested features**

- Add a golden starship IF
- Please add upgrades so we can have bettr ships


### Cube Flex Full

[App page](https://appshunter.io/ios/app/cube-flex-full/id1501334520)

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 600 coins | $0.99 | one-time |


## Frequently asked questions

### Is Kepler Attack free?

Kepler Attack costs $1.99, with no in-app purchases.

### Is Cube Flex Full free?

Cube Flex Full costs $0.99, and also offers in-app purchases.

### Do Kepler Attack or Cube Flex Full have ads?

Neither Kepler Attack nor Cube Flex Full shows ads.

### Which is updated more often, Kepler Attack or Cube Flex Full?

Kepler Attack ships an update every 2 months, and Cube Flex Full every 21 months. Most recently, Kepler Attack was updated on October 13, 2026 and Cube Flex Full on August 24, 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.*