When comparing Emacs Org-mode vs Amplenote, the Slant community recommends Emacs Org-mode for most people. In the question“What are the best cross-platform task apps?” Emacs Org-mode is ranked 3rd while Amplenote is ranked 55th. The most important reason people chose Emacs Org-mode is:
This app's flexibility is based on its minimalist approach, giving the user near-infinite freedom.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Ultimate flexibility
This app's flexibility is based on its minimalist approach, giving the user near-infinite freedom.
Pro Absolutely free
Emacs with Org-mode is free as in beer and free as in speech – that is, it costs nothing and it’s totally open source.

Pro Files are usable anywhere at anytime
Users are not tied to one service provider, program, platform, or database engine.

Pro Incredibly extensible
There are many plug-ins for Org-mode, including Org-habits and Org-notify. If Org-mode lacks some piece of functionality, it is very easy to add it.
Pro Agenda views
Pro Excellent unofficial Android app (orgzly)

Pro Offline support
Pro Efficient features for deadline organization
Pro Supports plaintext spreadsheets
Pro There are a lot of extensions, for exporting to html, bootstrap, js-reveal and much more
Pro Quickly add rich text
Pro Notes encrypted at rest on servers
See here.
Pro Long-term minded
Company has not raised venture capital.
Pro "Idea Execution Funnel" methodology
Schema follows sensible flow from capture to revision to prioritize to schedule.
Pro Community-driven
Team maintains a voting board at https://amplenote.featureupvote.com that drives development roadmap, ensuring calibration between note enthusiasts and the product.
Pro Publish and share notes
Publish notes to the web (with configurable URLs) or share notes with collaborators.
Pro Offline-first
Fully functional offline mode.
Pro Omniplatform
Can be installed on macOS, Linux, Windows (via PWA), iOS and Android.
Pro Task/calendar syncing (Google Calendar & Outlook)
Any task with a date/time assigned to it will be exported to calendars optionally connected. Completing the task removes it from calendar.
Pro Multi-level tagging (personal/hobbies/bike-rides) to keep organized
Any note can be assigned as many deeply nested tags as desired. The tag hierarchy can be navigated, filtered on tasks or notes.
Pro Backlinking & networked note references
Amplenote supports the same [[]] syntax popular in Roam to create a link to an existing note. Every linked note has a tab with all the references into that note.
Pro Automatically sorted task list
Every task can be marked as "Urgent" or "Important," along with the time it's due. This makes it possible for the software to automatically sort your todo list in a way that makes sense, and save you time of deciding what to work on first every day.
Cons
Con Unintuitive user interface
The key combinations are unintuitive and difficult to remember. This is probably because there are a lot of hidden "modes" depending on where the cursor is. Actions aren't paired with reversing actions like in other todo apps. For example, hitting shift-tab does NOT reverse the effect of hitting tab.


Con Android app isn't very good
There are several user-created apps for Android, but none seem to offer the same level of functionality as other to-do apps.
Con Not really cross platform
Although it is possible to get a lot of it working, no all in one, sync included, out of the box solution is available for mobile devices.
Con By default, a hard-to-read display
The default way of writing an outline or checklist creates a very messy wall of text that's difficult to read with no vertical spacing. You can manually add vertical spacing, but the Org operations don't preserve it. There are pretty-display modes, but you need to remember how to enable them, etc. etc.
Con Not end-to-end encrypted
See here.
