Experimental parallel layout engine started at Mozilla; research / embedding more than everyday browsing.
Official: servo.org
Send the User-Agent to the API, device, OS, browser, and bot detection come back in one response. Paid deep returns the engine as `Servo` when the string matches.
curl -s "https://api.parseapi.com/useragent?deep=true" \
-H "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15" \
-H "X-Api-Key: $PARSEAPI_KEY"
# deep.engine → { "name": "Servo", "version": … }