Application like Grammarly?

Hello everyone, I'd like to know if you guys are aware of anything similar to Grammarly (the keyboard plug-in) that might work for Russian.

I ask this because I am learning Russian by studying exclusively vocabulary, watching videos and speaking to people, and the result was very very quick progress, although I basically speak by always using the nominative case, and moreover my verb tenses usage is a little random. I noticed that my progress in speaking and understanding is quick and constant, but the one in correctly using grammar and knowing when to use it is very slow (well, I never studied it so it makes sense). In short, I don't really have time to buy a book and sit at the table, I already study in a pretty challenging university, and studying Russian is an evening hobby which allows me to rest from the books, and so I'd like to know if you guys can give me advice; maybe you know some application that corrects the text as you write, like Grammarly does? That way I'll get automatically corrected, and hopefully improve in that area too by observing corrections, without having to open another book.