Apps similar to Cloud Outliner Pro include Workflowy, which has a free version. Other options are Dynalist, Orgzly, OmniOutliner and Orgzly Revived. You can choose from more than 10 Note-taking Tools like Cloud Outliner Pro for Mac, iPhone, iPad, the web and Android.
Bike is a macOS (11 and later) native outliner. Bike has good performance on big outlines. Bike uses open file formats and is scriptable too. Use Bike to record and process your ideas.
United States
Collect your thoughts with this minimalist, but powerful Notes / To-Do app. Features include offline support, infinite nesting, search, and sync between devices.
Cross-platform app for Mac, iPhone, iPad, and iPod Touch. Sync outlines between computers and devices with iCloud. Sync outlines with Evernote, Import and export outlines in OPML format.
Ukraine
CrossLine is an outliner with sophisticated cross-link capabilities in the tradition of the well-respected Ecco Pro. It implements the concept of "Transclusion" proposed by Ted Nelson and - among others - implemented in the legendary Objectory SE tool by Ivar Jacobson.
Great application for creating lists and outlines that need to be accessible anywhere, good for reoccurring shopping lists or check lists / notes on how to do a complicated or seldom used procedure. Can also view and use a check list or outline from the easy web interface!
