When comparing ONLYOFFICE vs hackmd.io, the Slant community recommends hackmd.io for most people. In the question“What are the best cross-platform writing apps?” hackmd.io is ranked 10th while ONLYOFFICE is ranked 19th. The most important reason people chose hackmd.io is:
Allows multiple people to edit the same note in realtime.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Available for Windows, Linux, MacOS, iOS, and Android
ONLYOFFICE offers desktop applications for Linux, Windows, and MacOS that can be connected to the web-based solution for document sharing and collaboration.
Pro High MS Office compatibility
Highly compatible with .docx, .xlsx, .pptx as well as with .odf.
Pro Collaboration capabilities
Pro Can be used as a web app
ONLYOFFICE offers a web-based office suite that can be deployed on your own server using various deployment options, including Docker script and virtual machines with the software pre-installed.
Pro Has a portable version
ONLYOFFICE portable works on almost every Linux distribution.
Pro Advanced work with math equations
Pro Integration with Nextcloud
Easy integration with Nextcloud for collaborative work.
Pro Free and open source
ONLYOFFICE is distributed under AGPL v.3 license with the source code available on GitHub.
Pro Support for add-ons (plugins)
Pro Collaborative
Allows multiple people to edit the same note in realtime.
Pro Automatic "table of content"
Automatically generates a "table of content" of your headlines.
Pro Supports revisions
Allows you to go back in time to a previous version of your document.
Pro Edit and view-only permission settings
Note: Enterprise Edition has even more refined permissions, but the permissions in the non-enterprise edition are pretty powerful.
Pro Shortcuts from Sublime Text, Emacs, and Vim
Pro Tag support
This is truly helpful for organizing your documents.
Pro Can create slide-shows
Supports creating slide-shows in markdown.
Pro Online
It's multi-platform (works well on smartphones) and there is no need to install anything.
Pro Math support
Use LaTeX seamlessly within the editor.
Pro Dark and white theme
Perfect for working at night.
Pro Lightweight
Pro Book mode view
This is really helpful for longer documents. Or even "books." This is also super helpful for journaling activities and the like.
Pro Available as a web service
HackMD service can be downloaded and installed in custom servers.
Pro Cross platform
Is available as desktop app.
Pro Dropbox import and export
Pro Extended markdown syntax
Adds supports for embeddings from Youtube, Vimeo, Speakerdeck, GitHub gist etc; and even creating UML diagrams, Graphviz graphs, Timing charts, and even Music notes! and alerts and comments boxes and emojis.
Pro Open source
HackMD Core's source is available on GitHub.
Pro Free
You can subscribe to it for more features.
Pro Github Gist import and export
People who subscribe can push and pull unlimited.
Pro Google Drive import and export
Cons
Con Web app
It is a text editor that is running in a browser window, how can you trust this? Not to mention that it needs a lot more system resources than native apps.
Con Custom grammar and spell checker
It does not work well in French (and probably other languages).
Con Not as beautiful as StackEdit
Con Cannot organize notes
Doesn't have the ability to organize notes or create notebooks.
Con Slow servers / problem with online / offline switching
Servers can be slow / down for a few seconds preventing from working on the documents currently being edited.
Con No PDF export support
Con Tries to be smart
It guesses what you want to do and tries to help, often in a wrong and annoying way, for example it when working with list items. Ironically Markdown was built to solve those problems (you format yourself with simple codes and it just works).