It's https://lingvist.io/ and it's another language learning site

How good do you get with these two together?

I just tried it out for a while and was not at all impressed. Better to use a standard grammar textbook plus something like Anki imo. 

I finished my french tree and quite frankly, i suck at it. Thanks for the advise.

I finished the french tree and honestly lingvist.io is a must. The french tree in itself is just not enough for much.

Tip to those starting/studying french: Use lingivst.io in combination with Duolingo.