Chess

AI Factory’s Chess is one of the most rewarding offline chess opponents you can install on Android. Its Treebeard engine plays a natural, human-feeling game, and the optional Chess Tutor explains threats and openings while you play, which is far more useful to a learner than a bare engine. The cost is advertising: a banner sits on screen during games and full-screen ads appear between them. If you can live with that, or pay for the separate Chess Pro edition, this is the offline opponent we would point most improving players toward.

AI Factory built it as a single-player and learning tool rather than an online platform. There is local hot-seat play for two people sharing a device, but the heart of the app is you against Treebeard, with or without the Tutor at your shoulder. Judged as that, a practice partner and coach that works anywhere, it holds up very well, and a long track record with more than 50 million downloads reflects it.

An engine that makes believable mistakes

Most of what sets this app apart comes from Treebeard, AI Factory’s own engine, which also powered Microsoft’s MSN Chess. Search-heavy engines such as Stockfish are built to calculate enormous numbers of lines and pick the strongest. That is ideal for analysis, but when those engines are dialled down for beginners the play can feel robotic, with strong moves mixed with errors that don’t resemble a human opponent’s.

Treebeard takes a heuristic approach instead, choosing moves on positional and strategic grounds in a way that reads more like a person thinking about the board. At its lower levels AI Factory uses what it calls intelligent weakening, so the engine plays a plausible weaker game rather than a strong game with random gifts. In practice that matters more than raw strength. A beginner learns little from beating an opponent that drops its queen for no reason; they learn a great deal from beating one that makes the kind of positional errors a player at their level would make.

The 12 levels give a wide ladder, from complete beginners to experienced players. Players consistently single out this quality: games against Treebeard feel like games against a real opponent, especially at the lower levels, without the erratic swings that make some weaker engines frustrating. And because everything runs on the device, it plays the same on a plane as on home Wi-Fi.

The Chess Tutor is the standout feature

If Treebeard is the reason the app feels good to play, the Chess Tutor is the reason it is good for improving. It is an optional, real-time coach layered over your games. It highlights squares where a piece would be unsafe, points out pinned pieces, names the opening line being played, the Queen’s Gambit for example, and can recommend a move with a breakdown of why it is strong.

That combination targets a gap many casual players struggle with: the step from knowing the rules to not losing pieces to simple tactics. Seeing an unsafe square flagged before you move there teaches the pattern at the moment it matters, rather than only in hindsight after a lost game. Naming openings as they happen also gives newer players a vocabulary to look up later, which a silent engine cannot offer.

Because the Tutor is optional, it doesn’t get in the way once you outgrow it. Its teaching is built around the position in front of you, which suits people who learn by playing rather than by working through structured lessons.

Chess960, Pro Mode and personal ratings

Two features keep the app interesting once the basics are in place. The first is Chess960, also called Fischer Random, in which the pieces on the back rank start in one of 960 randomised arrangements. Memorised opening theory stops helping from the first move, so every game becomes a test of fundamentals. Chess960 is fully unlocked in the free app, which is generous.

The second is Pro Mode, which tracks a personal ELO rating based on your results against the computer, while the app keeps detailed game statistics alongside it. The difficulty levels are matched to ELO ratings too, which makes it easier to pick one that suits your strength. One caveat is worth keeping in mind: the rating is earned against Treebeard alone, so it works best as a measure of your own progress over time rather than a number to compare with an online or over-the-board rating.

Two-player games and saving your work

For two people sharing one phone or tablet, local hot-seat play is built in. The multiplayer screen has one small but noticeable omission: there is no direct rematch shortcut, so lining up another game against the same person isn’t a single tap.

More useful for serious players is full PGN export. Games can be saved in the standard format and opened in other analysis software, so the app fits into a wider study routine. Account linking, by contrast, is limited mainly to Google Play Games, which is worth knowing if you hope to carry progress across other platforms.

Where it falls short: ads and an older look

The monetisation is simple and worth stating plainly. This is the ad-supported edition: a banner ad stays on screen during play, and full-screen ads appear between matches. Chess asks for sustained concentration, and a recurring theme in player feedback is that the animated banners at the top of the screen are distracting mid-game. Some players on older devices also report minor lag that they associate with those animations. The chess itself draws few complaints; the advertising around it is the most common point of friction.

AI Factory’s option for players who would rather not see ads is a separate premium edition, Chess Pro. The naming has shifted over time: this app used to be called Chess Free, and was renamed simply Chess after Google Play tightened its rules on pricing words such as “free” in app titles. If you remember the old name, this is the same app.

The other caveat is presentation. The visual design is clear and functional, but it can look dated next to modern chess titles with 3D boards and polished animation. For many players an uncluttered board is exactly right for study; anyone who wants a showpiece will find the style plain.

Getting the most from it

The features fit together into a sensible progression. A newer player can start at one of the lower levels with the Tutor switched on, using its warnings about unsafe squares and pinned pieces to stop giving away material. As wins come more often, raising the level and switching the Tutor off shows whether those habits hold without prompting. Pro Mode then gives you a running rating to track, and an occasional Chess960 game is a good check on whether you understand positions or have mostly memorised openings. If you study more seriously, PGN export lets you review your games in whatever analysis tool you already use.

How it compares to the alternatives

Chess.com is the obvious alternative and a different kind of product: an online platform built around games against people, lessons, puzzles and community, with its fullest game-review tools reserved for paid memberships. It is the better choice for rated games against humans, but it is built around online play and an account.

Lichess is free, ad-free and open source, with excellent online play and Stockfish-based analysis. Its strengths are online games and post-game analysis rather than live coaching during a game against the computer.

Against both, AI Factory’s position is distinct: a human-feeling offline opponent with a coach built in. Many players will reasonably use it alongside one of the online platforms, with Chess for practice and learning on the go and an online app for games against people.

Who it’s not for

If you mainly want to play real people online, Chess.com or Lichess will suit you better; this app is designed around solo and local play. If ads during a game would break your concentration and you don’t want to buy Chess Pro, the free edition may not be a good fit. Players who value modern visual polish will find the presentation dated, and anyone who wants progress tied to accounts beyond Google Play Games will find the options limited.

The verdict

The app is still actively maintained, with its Play listing updated in September 2026, and more than 1.5 million ratings point to a large, long-standing player base. Treebeard makes low-level practice genuinely enjoyable, the Tutor turns ordinary games into lessons, and Chess960 and PGN export come at no charge.

Go in expecting ads during and between games, a look that favours function over flair, and a focus on solo play rather than online matches. For learning, practising and playing chess offline, it remains one of the strongest free options on Android, and the one we would suggest to most beginners and improving players first.