Safari engine comparison

This test uses synthetic positions only. It does not read your games, save results, send results, or identify your browser. Results stay on this screen.

Repeated searches pause for one second between responses. The 50-search test takes about a minute. A and B need browser isolation and SharedArrayBuffer; C is experimental.

Stop releases the runtime. Start retries from a new synthetic position. Reset clears the visible result. Leaving or backgrounding this page stops the run; return and press Start when ready.

Visible results

Test sequence

On Mac Safari 26.2 or iPhone 13 Safari: run A once, B once, then C once. Next choose 10 searches and repeat A, B, C. If practical, try 50 searches for B and C. Try Stop, Start again, Reset, and one page reload. On iPhone, also background Safari during a run, return, and note what the screen says. Stop if the device becomes uncomfortable to use.

No developer tools needed. Copy a result before changing mode or resetting, or take a screenshot. Send only that text or screenshot to the owner if you wish. Copy does not submit anything.

Full test instructions · Licences and exact source downloads · File hashes

This is a temporary engine experiment, not the chess application or a Safari compatibility guarantee.