Federico Viticci gave a shout out to Keep It in his My Must-Have iOS Apps, 2018 Edition:

A reimagined Evernote with support for iCloud, iOS automation, rich text and Markdown notes and, more importantly, desktop features such as saved searches and full-text search. I’m glad I switched to Keep It before the summer, and I’m looking forward to major updates in 2019.

You may remember Together for Mac OS X, which was a digital shoebox in the vein of Yojimbo, Evernote, SOHO Notes, StickyBrain, and my current favorite, DEVONThink Pro. Keep It looks and feels like a modern Mac app, with accompanying iOS apps and sync via iCloud. You can buy directly from Reinvented, or subscribe on the Mac App Store.