Please, don't use Grammarly if you want to remain anonymous online under different names on different platforms. They record every sentence that you type, then analyze your writing ability, your writing style, manner, etc.
In order to improve your writing ability and expand your vocabulary, I suggest you to use Cambridge books, personally I love them and Thomas BJ has great books for vocabulary and idioms.
Thanks for the suggestion but I don't have a budget to buy these books do you have any free source?
I'm only using Grammarly sometimes when writing some content here or in WP blogs but when typing a password or copying/pasting some important details I always switch it back to the default keyboard(Samsung keyboard).
Okay, I'm talking about these books:
Elementary/Intermediate/Advanced Vocabulary Paper (Skills) by Thomas (Choose your level).
Cambridge Advanced Grammar in Use
I guess you can find their PDF versions online but if you can't but you really need these books, check them if are available in your country, to understand if you really like and plan to read & do exams in those books and I'll buy them for you.
The dude is living in the old days
even though it is good to read books and acquire knowledge from it the effort needed is like pain in the ass and I am not sure is there anyone willing to give such effort when we have an alternative that does the same job for free via tools such as Grammarly.
If I am not wrong in android, Grammarly is available in the keyboard format alone which is not really helpful because the built-in dictionary is almost available on all keyboards including the stock ones so there is no need to trust another one 3rd party app with our sensitive data.
Grammarly is good when we use it on a PC in the form of an extension so it can only collect the data from that particular browser alone not from the entire device.
I am not living in the old days and it's not pain in the ass to read and study from books, actually, Grammarly is only doing bad for you. When you make yourself dependent on 3rd party apps to write in English, then your brain gets a little bit lazy and over time, you'll understand that this tool stopped you from learning English. Also, you can't use Grammarly when you travel and have to speak in English with different people, you can't use Grammarly when you speak to the audience in English.