Where to write a secret journal?

The Situation:
I've been using tumblr to write many random private thoughts for the past 2 years and i just wanted to move all my posts to another platform. Tumblr is unorganized when it comes to reflecting upon a post that you made a year ago.
I like to write thoughts electronically. Sometimes if i can't sleep before bed, i want to be able to post any thoughts through my iPhone instead of getting out of bed just to write something on my laptop. So does this narrow it down to something like making my own private website?

The Question:
Are there any other ways of me being able to write electronically through my laptop AND my iPhone? I want these posts to appear offline but i want to be able to post through my iPhone when i go to bed.

oh yeah and i have a terrible memory so thoughts in my head will never be remembered.

There are other blogging sites that allow you to use both laptops and phones. Wordpress and maybe Blogger. I don't know, but Wordpress has an app. It has a different format than Tumblr but I don't know if it will suit you…

In a secret journal