When comparing Write! vs Joplin, the Slant community recommends Write! for most people. In the question“What are the best open source Markdown editors for UNIX-like systems?” Write! is ranked 10th while Joplin is ranked 17th. The most important reason people chose Write! is:
Write! has tabs at the top and a tree view on the left that allows quickly switching between different files.
Specs
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Pros
Pro Allows easily switching between working on multiple files
Write! has tabs at the top and a tree view on the left that allows quickly switching between different files.
Pro Interface doesn't get in the way of work
The interface is minimal, when it's windowed there are no buttons or toolbars, so it doesn't distract from work. When it's in fullscreen, there's just text, no interface at all.
Pro Endless undo/redo
Write! uses a file format that saves all versions of a document. Meaning even if the app is closed and then opened up again, Write! can restore any previous version of the document.
Pro Can double as a to-do list app
Write! has a to-do list mode that allows creating lists of items in groups (tabs) that can be ticked off when completed.
Pro Picks up where you left off next time you start the app
Write! saves the state that it's in when closed and restores that state when opened. You can pick up working on documents in the exact same place you left off - same documents open, same cursor placement, etc.
Pro Offline access
Pro Open source
Peace of mind that there is no malicious piece of software in the app.
Pro Encryption
Pro Cross-platform
Supports Windows, Mac, Linux, Android and iOS.
Pro Supports file attachments
Pro Supports markdown
Pro Supports tags for notes
Pro Web Clipper
Browser extension saves full pages, clean content, or screen selections to new notes.
Pro Optional CLI interface
Provides a CLI interface for terminal lovers.

Pro Supports multiple languages
English, French, and Spanish, Italian, German, Czech and many others.
Pro Active user forum with support from app creators
Support, troubleshooting, and new feature requests are easy to make at the user forum and you can contact the app creator directly.
Pro Dropbox support
Can sync using Dropbox.
Pro Nextcloud support
Pro Timed alarm reminder for to-do lists
Cons
Con You need to login to the App, and it reconnects to their server
There is no offline use.
Con Not free
There are free markdown editors for windows, this is not one of them.
Con Needs better folder document management like Ulysses
Con Needs nested folders
Con Bad MarkDown features
Not worth $20, the markdown editor sucks.
Con In beta
The app is not yet complete. A lot of the promised functionality is not yet implemented.
Con Sync issues with Android
If update on Linux then sync on Android, sometimes the Android sync will duplicate or remove some journal notes. Seems to be a bug in the Android app. The Linux app alone without sync with Android seems to work well using Dropbox. But don't expect changes you make on Android to sync properly back to Linux.
Con Sync issue under Linux
The Linux client has a bug that requires the user to click the mouse frequently in order for sync to proceed. This bug has been open for a while.
Con Gargantuan memory footprint
1GB+ of memory for taking notes.
Con Old school interface
Con Bloated
This project is suffering from feature creep and uses a lot of memory for a note-taking app.
Con App Image launches very slowly
On Linux, you can only install via App Image, which take 5+ seconds to launch. I can launch LibreOffice in under two seconds.
Con Sync issues on Windows
No way to change account settings and sync easily corrupted.
Con Weak tag searching
Joplin can currently only search for a single tag at a time. None of the boolean operators (AND, OR, NOT) are available for use in searches. This greatly diminishes the usefulness of tags in Joplin.
Con Can't create tags from the mobile app
