Note editor with latex (similar to evernote)?

Question

Evernote

Dear! Advise an analogue of the elephant, but so that with TeX. I tried OneNote, but I'm not satisfied with its paid price and the lack of a "reading" mode when you can't edit. Besides at MS as always miserable formulas.
For evernote, I tried installing scripts, but they only work in the browser. For the desktop, there is some kind of program written on the knee, but it's still not right.
In short: you need a note editor with support for formulas; offline or online - it doesn't matter; Presence of modes of viewing and editing is welcomed.

Answer 1

I don’t know ready-made solutions, I would try knee-high solutions.
Represent formulas like MathML, for example.
From / to TeX it is converted, rendered in browsers.
And we assemble the standalone application from a WYSIWYG TeX editor, a converter, and a component with a browser window.

Answer 2

Google Docs supports formulas in a TeX-like format.