Smultron is a text editor for macOS that is designed for both beginners and advanced users, named after the Swedish word for the woodland strawberry.

Smultron also includes syntax highlighting with support for many popular programming languages including C, C++, LISP, Java, Python, PHP, Ruby, HTML, XML, CSS, Prolog, IDL and D. Smultron only works with plain text files, without support for images or graphics.

[citation needed] Smultron was created by Swedish programmer Peter Borg as his first open-source project, in order to fix what he perceived as a lack of free, advanced, easy-to-use Mac text editors at the time.

It required Mac OS X Tiger, due to its adoption of the latter's new Core Data and Sync Services frameworks.

[7][8] In September 2009, Borg released version 3.6beta1 to make the app compatible with Mac OS X Snow Leopard.

Files could be moved from the local drive to iCloud through a menu, which reviewer Nicolas Furno criticized as "not ideal".