# AI Defense — Sci-Fi TD:Stop the AI Invasion

> Sci-Fi TD:Stop the AI Invasion (iPhone/iPad app by iDeaction.)

- Source: https://appshunter.io/ios/app/ai-defense/id1529248770 (this page in markdown: same URL + `.md`)
- Developer: [iDeaction](https://appshunter.io/developer/1286980208)
- Category: Games, Casual, Strategy
- Price: Free with in-app purchases
- Age rating: 9+
- Requires: iOS 15.0 · 314 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-06-16
- Data updated: 2026-07-28
- User reviews in markdown: https://appshunter.io/ios/app/ai-defense/id1529248770/reviews.md

## What is AI Defense?

This is a sci-fi idle tower defense game unlike anything you’ve ever seen!

AI machines have launched a counterattack against humanity, pushing mankind to the brink of extinction. With every last resource, humans built the strongest fortress ever created. You have been appointed as the final commander of humanity inside the fortress. Build and command powerful mechs, fight back against the invading machine legion, and reclaim the homeland humanity once lost.

Upgrade and promote every turret in your defensive fortress to attack the endless waves of mechanical enemies and stop them from breaching the city. Summon heroes from all fronts, send them beyond the walls to fight the enemy, choose the right skill combinations, and strike at the perfect moment to deliver a decisive blow. As the commander, you will engage in a battle of power and strategy against alien machines on this blue planet.

Commander, lead humanity and take back our home!

Game Features:

1. Exciting controls: unleash unstoppable power with just your fingertips.
2. Easy idle gameplay: earn plenty of rewards even while offline.
3. Stunning visuals: enjoy an immersive sci-fi cinematic experience.
4. Build your fortress and create an unbreakable defense.
5. Collect and upgrade mech heroes, then unleash full firepower in intelligent combat.
6. Mix and match skills freely. It’s time to show your tactical genius.
7. Multiple battlefield environments, including glaciers, deserts, and forests. Ever-changing battlefields await your challenge!

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Unlimited Ads Ticket | $9.99 | per 7 days |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Clearance reward pack | $9.99 | one-time |
| Clearance reward pack | $19.99 | one-time |
| Clearance reward pack | $49.99 | one-time |
| Clearance reward pack | $99.99 | one-time |
| Clearance reward pack | $99.99 | one-time |
| Clearance reward pack | $99.99 | one-time |
| Clearance reward pack | $99.99 | one-time |
| Clearance reward pack | $99.99 | one-time |
| Battle Pass | $9.99 | one-time |



## Version history (last 5 releases)

### 1.3.1 — 2026-06-24

Fixed the issue where bosses could overlap when spawning.
Improved the visual effects of the glacier map.

### 1.3.0 — 2026-06-20

- The Store is officially open, featuring Ad-Free items, great-value Diamond packs, special value bundles, and the Battle Pass.
- Optimized game performance and improved visual quality.
- Fixed several bugs for a smoother gameplay experience.
- Adjusted the experience for several levels and event monsters.

### 1.2.0 — 2026-04-12

Improved the game's visual art presentation
Fixed bugs and improved overall game stability
Optimized the account binding feature

### 1.1.77 — 2021-09-08

优化防沉迷系统.
优化活动奖励内容.

### 1.1.76 — 2021-08-24

解决部分bug.

## More apps by iDeaction

- [AMG2](https://appshunter.io/ios/app/amg2/id1443704318)
- [Eternal Fortress: Defense](https://appshunter.io/ios/app/eternal-fortress-defense/id1562794707)

All apps by iDeaction: https://appshunter.io/developer/1286980208

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-28.*