Simple chess FEN/PGN viewer with evaluation

SimpleChessBoard promo image
What is SimpleChessBoard?

SimpleChessBoard is a Firefox add-on by Firefox user 13349446. This add-on has 94 daily active users and a good user rating of 4.67. The latest version, 1.6, was updated 5 years ago.

Stats date:
Users: 94 ▲ 5
Rating: 4.67 (3)
Version: 1.6 (Last updated: 2018-09-01)
Creation date: 2017-10-10
Weekly download count: 5
Firefox on Android: Yes
Manifest version: 2
  • storage
Size: 643.99K
Risk impact: Very low risk impact
Risk likelihood: Low risk likelihood
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Other platforms

Not available on Chrome
Not available on Edge

ChromeStats Rank

SimpleChessBoard is simple chess position and game analysis tool available as browser extension and as a web page at


* Load your chess position or game using FEN or PGN.
* Setup pieces manually with your mouse in edit mode.
* You can browse game history and try out different variations. Arrow is showing last move and move recomennded by engine.
* List all legal moves and show them on chessboard
* Checkmate or stalemate is detected
* Analyze position and all legal moves with javascript version of Stockfish from
* Show evaluation graph and visalize mistakes or blunders with different colors
* Open position or game in new window via URL. You can also share this URL with friends (in online version) and your position or entire game will be encoded in the link.
* You can also play chess against computer

Copy your FEN or PGN to clipboard and paste it in the input box at the top. You can also manually
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Risk impact

SimpleChessBoard is safe to use. It does not request any sensitive permissions.

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypass your security settings, and access your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Risk likelihood

SimpleChessBoard has earned a fairly good reputation and likely can be trusted.

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Browser Add-ons, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on, especially ones with higher risk impact and/or higher risk likelihood.

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