I've just launched Focused 2, a free upgrade for current users and it works on Sierra
The app has also been transferred to Codebots.co.uk, a company that I'm the founder of.
71Squared has historically targeted developers and pro users with tools like Particle Designer and Glyph Designer. Last year 71Squared acquired Focused and Deep Dreamer from Realmac Software. We've loved taking on the responsibility of these apps, but at the same time it's distracted us from what 71Squared set out to achieve.
The update should 'just work' with your current license, so go ahead and give it a try.