About this site
Best Chess Extension is a guide to Chrome extensions for chess: what each one does, what it can access in your browser, and where it is allowed under the fair-play rules of Chess.com and Lichess. It is made by the team behind ChessHelper (chesshelper.ai).
Why this site exists
Search for "chess extension" and you will find a mix of useful study tools and overlays sold for use during live games, often side by side and described in the same words. We built this site to separate the two, to explain Chrome permissions in plain language, and to make the case for our own product honestly, next to the alternatives.
Our relationship with ChessHelper
This site is made by the ChessHelper team. ChessHelper (chesshelper.ai) is our own product, and we earn money when people subscribe to its Pro plan. That is a material connection, and under the US Federal Trade Commission's rules on consumer reviews (16 CFR 465) you should know it before you read any ranking here. We disclose it at the top and bottom of every page.
We handle the conflict in four ways:
- We rank ChessHelper first for one job only: learning and analysis at your own level. We name the extensions that do other jobs better, such as Chessvision.ai for positions in videos and the free Lichess bridges for unlimited full-strength analysis.
- We publish its weaknesses. The ChessHelper review lists the free-plan limits, the data it handles, and settings to keep off in games against people.
- We use checkable facts. Every extension card links to its Chrome Web Store listing, and permission summaries come from each extension's published manifest file.
- We do not invent evidence. No star ratings, testimonials or made-up test results appear on this site.
Editorial approach
We compare published features, store listings, permissions and pricing, and we check fair-play rules against the sites' own policy pages. Chess positions and lines on this site were checked for legality and evaluated with Stockfish before publication. The full method is on How we compare.
We do not list extensions whose purpose is to suggest moves during live games against people. Using them gets accounts closed, and recommending them would not serve readers.
Who writes it
The pages are written and maintained by the ChessHelper team. We do not attribute articles to individual named reviewers, because we would rather you judge the content by its sources than by a byline.
Report an error
Extensions change quickly. If a listing, permission or price on this site is out of date, or a chess line is wrong, write to contact@bestchessextension.com with the page and what changed. We correct verified errors and update the date on the page. See Contact for details.