Three mahjong AIs, side by side on one screen.

Compare NAGA, Mortal, and Gokujan reviews. Supports Mahjong Soul / Tenhou replays. Free.

👀 View the demo (no signup)📖 How to use

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The actual review screen: bars from the three AIs above your hand tiles

Compare three AIsRecommendations shown as bars and a table

Jump to mistakesOne click to moves the AIs rated low

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The three AIs

NAGA — an analysis service by Dwango Co., Ltd. (the “Nishiki” model)Mortal — an open-source mahjong AI (by Equim, free analysis)Gokujan — an analysis service by Kyoko@mj

FAQ

Is it free?

This tool is free. Use of each AI service is subject to that provider’s terms.

Does it run the analysis for me?

No. You analyze on each AI service yourself, then register the result URLs — this tool merges them into one screen (respecting each service’s rules). See the guide for details.

Does it work on phones?

Yes, it works in mobile browsers. Landscape orientation is recommended.

Have data from another device? Import a backup