# AI x0 (Tic-tac-toe) UNBEATABLE

> Unbeatable AI Tic-Tac-Toe game with a recursive algorithm. (iPhone/iPad app by Elena Chiorsac.)

- Source: https://appshunter.io/ios/app/ai-x0-tic-tac-toe-unbeatable/id343187444 (this page in markdown: same URL + `.md`)
- Developer: [Elena Chiorsac](https://appshunter.io/developer/343187447)
- Category: Games, Entertainment, Board, Simulation
- Price: $0.99
- Rating: 3.50/5 from 6 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 5 MB
- Languages: American English
- Released: 2009-12-09
- Data updated: 2026-09-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ai-x0-tic-tac-toe-unbeatable/id343187444/reviews.md

## What is AI x0 (Tic?

AI x0 (Tic-tac-toe) - UNBEATABLE!!

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This one uses a robust AI (Artificial Intelligence) engine with a mathematically designed algorithm** that ensures that it WILL NEVER lose!!

Your objective in this single-player contest of "The Human against The Machine" is to score as close as possible to the machine in a series of games.
  - A win earns 2 points and a draw earns 1 point;
  - At each game you can choose either to play as 'X' (thus making the first move) or as '0' (the machine makes the first move as 'X' then). 


CREDITS:

Used FREE sound samples from freesound.org.  
Special thanks to individual contributors - see http://www.freesound.org/usersAttribution.php?id=1281637&format=html


Professional testing services for mobile applications provided by Nizam Abdallah.


**The algorithm is an original adaptation and implementation for Objective-C of the idea explained in a classic Computer Science book:
Linger, R.C., H.D. Mills, and B.I. Witt,  Structured Programming: Theory and Practice, Reading, MA: Addison-Wesley, 1979




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PLEASE NOTE:  

Because the key idea is to demonstrate in action the power of a "pure" and deep recursive AI algorithm, this app does NOT contain any "hard-wired" knowledge database or "heuristics" regarding what move would be commonly known as a good move to make at start (or at any stage whatsoever).

Therefore, it does take a substantial amount of processing cycles for the Machine to "think" in order to make the very FIRST move when it is the one to go first (i.e. when you play as 'O', and the machine as 'X').

The exact time it will take greatly depends on the "raw power" (speed) of the CPU found in your particular device model.

From observations, it takes from about 7-9 seconds (on iPhone 3G S devices) and up to about 25-30 seconds (on some of iPod Touch devices).

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## Key features

- Unbeatable AI engine
- Mathematically designed algorithm
- Single-player mode
- Score-based gameplay
- Choose to play as 'X' or 'O'
- Recursive AI algorithm

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/ai-x0-tic-tac-toe-unbeatable/id343187444/reviews.md

### 5/5 — Ai why you so mean?

*2011-08-14*

Victory will be mine. Also tap the i in the bottom right to turn off the sound. It's not rocket science.

### 1/5 — Impossible

*2011-08-14*

Stupid game

### 5/5 — rock-solid!!!

*2011-05-06*

does what it says...

### 3/5 — No Option To Turn Off Sound...

*2010-11-30*

Need option to turn off sounds. With this option, I would give it 5 stars.

### 4/5 — Pretty cool, but....

*2010-11-30*

It's a cool app, would be much better with the ability to toggle sound on & off. The sound is mad loud and too friggin' annoying to play at work.

## Frequently asked questions about AI x0 (Tic

### Does AI x0 have ads?

No, AI x0 does not contain advertisements. It is a paid application.

### How much does AI x0 cost?

AI x0 is a paid app, priced at $0.99.

### What devices support AI x0?

AI x0 is available on Apple TV, Apple Watch, iPhone, iPad, and iPod Touch.

### What is the age rating for AI x0?

AI x0 has an age rating of 4+, making it suitable for younger players.

### How often is AI x0 updated?

The latest version, 1.9.1, was last updated on March 16, 2026. The app has a history of updates, indicating ongoing support.

### Why does the AI take a long time to think for the first move?

The AI uses a deep recursive algorithm without hard-wired knowledge. This requires significant processing cycles, especially for the first move when the AI goes first, with thinking times varying by device speed.

### What is the gameplay like in AI x0?

The objective is to score as close as possible to the AI's score. A win earns 2 points, and a draw earns 1 point. You can choose to play as 'X' or 'O' in each game.

### What is the user sentiment for AI x0?

AI x0 has an average rating of 3.5 stars from 6 ratings, suggesting a mixed but generally positive reception among its users.

## Version history (last 5 releases)

### 1.9.1 — 2026-03-16

misc fixes and refinements to UI/UX

### 1.9.0 — 2026-03-14

added watchOS app variant (for Apple Watch), plus internal improvements

### 1.8.4 — 2025-12-27

fixed a typo in the flipside screen

### 1.8.3 — 2025-12-16

fixed layout and links on Info view for iPad

### 1.8.2 — 2025-12-15

refreshed and rebuild to suit up-to-date versions of iOS and tvOS

## Apps similar to AI x0 (Tic

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Tic Tac Toe](https://appshunter.io/ios/app/tic-tac-toe/id287949186) | 4.5 (2,749) | Free | Games |
| [Tic Tac Toe](https://appshunter.io/ios/app/tic-tac-toe/id289204878) | 3.0 (5) | Free | Games |
| [Tic Tac Toe ∙](https://appshunter.io/ios/app/tic-tac-toe/id289278457) | 4.5 (74,558) | Free | Games |
| [Tic Tac Toe Pro](https://appshunter.io/ios/app/tic-tac-toe-pro/id294293446) | 4.6 (752) | $4.99 | Games |
| [Tic Tac Toe - Glow](https://appshunter.io/ios/app/tic-tac-toe-glow/id423963189) | 3.6 (45) | Free | Games |
| [Five in a row - Pentaballs](https://appshunter.io/ios/app/five-in-a-row-pentaballs/id462936390) | 4.6 (321) | Free | Games |

## More apps by Elena Chiorsac

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- [Christmas Cards - Artistic](https://appshunter.io/ios/app/christmas-cards-artistic/id1324018763)
- [Floof Stickers](https://appshunter.io/ios/app/floof-stickers/id1446235608)

All apps by Elena Chiorsac: https://appshunter.io/developer/343187447

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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 2026-09-01.*