Is tumblr free to use?
So it absolutely free, no fees and no cost at all in tumblr?
Right. Why do you ask?
I just want to make sure that tumblr is really free to use?
You could just try using it and see if it asks for money at any point.
But it's definitely free.
Now, some people sell themes for it and whatnot, but the Tumblr blog service, by itself, is free.