Robust Evernote alternative.
Keep It is a notebook, scrapbook and organizer, ideal for writing notes, keeping web links, storing documents, images or any kind of file, and finding them again. Available on Mac, and as a separate app for iPhone and iPad, Keep It is the destination for all those things you want to put somewhere, confident you will find them again later.
Clean Design, Reasonable Price
Sluggish, Not Robust, and Buggy
I don't want to sound harsh but I've tried this for a while, both the iOS and macOS app. They are fine, but not great. You'll face strange bugs every know and then, and the app starts to behave unstable as soon as you push it. I would not recommend it. A solid alternative would be DEVONthink.Amir has used this product for one year.
Clean, great tagging/filtering, supports all file types, selective folder/list sync
(Initial) syncing can be sluggish
Great app, cross between "Everything drawer" (Devonthink) and note taking (Evernote). Cheap compared to both, well designed. I especially like
1. the tag-based filtering options,
2. that it uses the (macOS) file system (you can browse all lists in the Finder, tags are written to the files), and
3. that i can selectively sync (download) files and folders on iOS.
Also: Very fast response to my support questions.F.E. has used this product for one month.