Apps these days, man. It's amazing what they can do. Now you can do a daily devotional that people can subscribe to with nothing more than your iPhone.
We started a Daily Devotional called 15for15 - we take the first 15 minutes of every day of 2015 and spend it with the Word. I wanted to think of a super-simple way to get kids in the Word every single day. Something where they could just pick up their phone and a message was waiting right there for them.
That's when I started to use Remind for this. Remind was originally a service designed for teachers to communicate with classes but has evolved into so much more. And the best part is that anyone with a phone that sends and receives text messages can subscribe - they don't have to have a smartphone with Remind installed. Day One is a simple journaling app for OSX/iOS that lets you publish entries as nicely-formatted web pages.
I've made a screencast below that I think you'll enjoy. If you would like to start a daily devotional for your ministry or congregation and you have an iOS device, this would be the way to do it.
Note: the Publish feature is currently only available on iOS from Day One. No idea why you can't do it yet from the desktop version, but you can't. You can, however, compose your devos in the desktop app and then pull them up on your phone and publish them there.