# RobotVSAlien vs Doodled Fish Tank

The clearest difference is update cadence: RobotVSAlien at every 2 weeks against Doodled Fish Tank's every 8 months. RobotVSAlien also leads on iOS requirement (7.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. RobotVSAlien sells 1 one-off in-app purchase and Doodled Fish Tank sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

RobotVSAlien ships an update every 2 weeks, Doodled Fish Tank every 8 months. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | RobotVSAlien | Doodled Fish Tank |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/robotvsalien/id863067072/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 8 months |
| Monetization | Free with in-app purchases | — |
| Size | 55 MB | 177 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 9+ |
| Developer | [Akihiro Fujiwara](https://appshunter.io/developer/721031264) | [晓泽 唐](https://appshunter.io/developer/1864363145) |

## What reviewers say

### RobotVSAlien

[App page](https://appshunter.io/ios/app/robotvsalien/id863067072)

Defend against alien invaders using a growing army of robots. This casual defense game allows players to upgrade and promote their units to increase their strength. Design your own giant robot and repel the alien threat.

**Highlights:** Casual defense gameplay, Unit promotion and upgrading, Design giant robots, Repel alien invaders, Unique robot and alien designs

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads and Privilege granting | $0.99 | one-time |


### Doodled Fish Tank

[App page](https://appshunter.io/ios/app/doodled-fish-tank/id6758345817)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| small | $0.99 | one-time |
| medium | $2.99 | one-time |
| VIP Lifetime | $4.99 | one-time |
| large | $9.99 | one-time |


## Frequently asked questions

### Is RobotVSAlien free?

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

### Is Doodled Fish Tank free?

Doodled Fish Tank is free to download, with in-app purchases available.

### Do RobotVSAlien or Doodled Fish Tank have ads?

Neither RobotVSAlien nor Doodled Fish Tank shows ads.

### Which is updated more often, RobotVSAlien or Doodled Fish Tank?

RobotVSAlien ships an update every 2 weeks, and Doodled Fish Tank every 8 months. Most recently, RobotVSAlien was updated on October 4, 2026 and Doodled Fish Tank on October 2, 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.*