Opal is described as 'Lets you organize just about anything — ideas, reports, lists, notes, projects, graphics — in the form of an outline. If you used Acta, you’ll love Opal' and is an app. There are eight alternatives to Opal for a variety of platforms, including Mac, iPhone, Windows, Android and iPad apps. The best Opal alternative is Orgzly Revived, which is both free and Open Source. Other great apps like Opal are OmniOutliner, Orgzly, Zavala and Visual Outliner.
Orgzly Revived is the most popular Android alternative to Opal.
Orgzly Revived is the most popular Open Source & free alternative to Opal.
OmniOutliner is a start-to-finish writing app. Perfect for collecting information, outlining Big Ideas, adding structure to any sort of writing, and much more. From grocery lists to email drafts to long-form composition.
OmniOutliner is the most popular Mac, iPhone & iPad alternative to Opal.
OmniOutliner is the most popular commercial alternative to Opal.
You can keep notebooks stored in plain-text and have them synchronized with a directory on your mobile device, SD card, Dropbox, or over WebDAV.
Orgzly is the most popular Android Tablet alternative to Opal.
Zavala is a modern take on a traditional outliner. It supports all the things you want in a Mac app like multiple windows, keyboard shortcuts, a customizable toolbar, and a full menu bar.
Visual Outliner is an outliner software for Windows, and it uses OPML as native file format. It's not just another tasklist application, but a real outliner editor that can be used to write, view, modify, and maintain hierarchically arranged text.
Visual Outliner is the most popular Windows alternative to Opal.
Dashword is by far the most convenient and user-friendly tool for creating any semantic network, be it your business idea, an abstract of a lecture on computer science, a script for a movie or a recipe for your favorite dish.
The beautifully crafted outliner for your Mac. Keep ideas structured and collected every day.
Password Locker is the only iOS Screen Time blocker that completely eliminates workarounds. It helps you stay focused by patching all known loopholes in Apple's Screen Time, ensuring you can't disable your app restrictions on impulse.
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