Yes. It is free and has no ads, and we do not plan to add any in the future.

Do I need an account?

You can try AI games, puzzles and analysis right away without signing up. Online games against people, tournaments and the league are available after you log in.

Yes, for iOS and Android. It uses the same account as the web, so your games and rating carry over.

Which languages are supported?

FlipSight supports 16 languages, including English, Japanese and Korean.

FlipSight

Online play, puzzles & analysis

Online: 12In game: 1Solving: 2

Free Online Othello (Reversi)

Play Othello on the web or in the app, practice with AI, solve puzzles, and review your games. Choose Play vs AI to practice, or log in and choose Quick Match to find an opponent.

How to play Othello

Trap your opponent’s discs between your own to flip them. The game ends when neither player can move, and the player with more discs wins.

Othello starting position: white discs on D4 and E5, black discs on E4 and D5. Black to move. — When Black plays F5, the white disc on E5 flips. There are now 4 black discs and 1 white disc.

After Black plays F5: E5 has flipped to black, leaving 4 black discs and 1 white disc. — When Black plays F5, the white disc on E5 flips. There are now 4 black discs and 1 white disc.

Othello Lesson

Play against AI or find an online match

Practice different moves against AI. To find an opponent, log in and choose Quick Match.

Play AI bots rated from about 1100 to 2300, each with its own style. You can also chat with the bot during the game, and it replies in its own personality.

Daily Arena and Weekly League

The Daily Arena is an online tournament held every day. For a set time, you are paired with new opponents automatically and compete for points and medals.

In the Weekly League, you collect points from rated games for a week, compete in a group of your tier, and climb from Bronze to Grandmaster. Members can also create their own tournaments.

What is Daily Arena?What is the Weekly League?

Review your games and practice

Replay game records move by move and compare candidate moves.

Import a game record to see the evaluation and best line for every move, and check your key mistakes and accuracy.

FlipSight analysis screen: candidate move evaluations on the board and the game evaluation graph below. — Compare candidate move evaluations and the course of the game at a glance.

FlipSight Key Moments screen: Athena compares F3 with the best move D2. — Review key moments with Athena.

Practice reading ahead and choosing moves with puzzles at different levels.

There are four puzzle types: XOT openings, midgame, early endgame and endgame, plus Puzzle Sprint, where you solve as many as you can in a time limit. Your puzzle rating goes up or down with your results.

FlipSight Midgame Puzzle: the best move on a textured board, the correct result, and the rating change. — Solve midgame puzzles and see the correct answer and your rating change.

AI Analysis Puzzles

FAQ

Is FlipSight free?: Yes. It is free and has no ads, and we do not plan to add any in the future.
Do I need an account?: You can try AI games, puzzles and analysis right away without signing up. Online games against people, tournaments and the league are available after you log in.
Is there an app?: Yes, for iOS and Android. It uses the same account as the web, so your games and rating carry over.
Which languages are supported?: FlipSight supports 16 languages, including English, Japanese and Korean.

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