I found #cemantle #14 in 244 guesses!
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cemantle.herokuapp.com/
It didn't to me (with the experience of only doing it once) seem to be as logical as semantle.
I cannot see whatsoever my first three words have to do with it at all. They were related to each other, but in no way to the actual word.
Normally with semantle once you have a green, then you can go through synonyms and you get a couple of hits which gives you an idea which way to go. Other than using different parts of speech (like sit, sat, sitting) there seemed to be little connection, and there are several words that now I know the answer I'd have thought would be pretty high up but weren't in the top 1000.
It's early days so maybe they'll be able to improve it though.