This guide might apply to other programs as well, and is simple enough to quickly try out. We are using Mountain Lion and the newest Evernote, version 5.0.4.
To do this, simply:
- Open Evernote
- Open a file within your Notebooks (anything you can type on)
- Find a typed word, and right-click on it
- Go to Spelling and Grammar in the menu that pops up
- In the sub-menu, uncheck "Correct Spelling Automatically"
- Repeat step 3 again, and go to Substitutions, uncheck "Text Replacement" if necessary