When comparing ShareX vs Mirillis Action!, the Slant community recommends ShareX for most people. In the question“What are the best screen recorders for Windows?” ShareX is ranked 2nd while Mirillis Action! is ranked 4th. The most important reason people chose ShareX is:
Designed as file uploader in the first place, ShareX supports overhelming amount of services for you to upload your files to and the list is expanding.
Specs
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Pros
Pro Allows uploading to a vast number of different services
Designed as file uploader in the first place, ShareX supports overhelming amount of services for you to upload your files to and the list is expanding.
Pro Free and open source
ShareX is licensed under GPL with source code available on GitHub.
Pro Customizable
You can choose what shortcut key to bind your command to, as well what host it uploads the file to.
Pro Freezes screen when you capture
When you enter a capture mode, the screen content is preserved as it was when you started capturing by default. However there is a special "Light" mode where the screen does not freeze.
Pro Can capture video too
Apart from still images, ShareX allows the user to record unlimited video with all the options available for normal image capture.
Pro Capturing (screen, video, a window, etc.) with annotation + automation
Capturing (screen, video, a window, etc.) with annotation + automation makes for some powerful workflows.
Annotation is key for research on any project size. Capturing screenshots, editing them ("annotating"), converting to a PNG, removing the background to make a transparent version, saving to google drive, creating large+med+sm sizes, uploading thumbnails, is an example of a workflow you could create. The list goes on...
You'll find the same strength & depth in features for image handling also for text, videos, other files by type, and on and on..
Pro Has an editor
It has its own screen editing tool.
Pro It has a dead simple way for creating animated GIFs
It is great for creating software tutorials or highlighting new features in a sales function - nothing beats a well-placed animated GIF in an email.
Pro It records without using the CPU and consumes less resources than OBS and is several times more fluid and intuitive
It consumes less resources and is more fluid than OBS. For example, a 1 GB GTX 750 records perfectly in 1920 x 1084 at 60 fps up to 4K, without using the processor, only the graphics card. Trying to do the same with OBS, the recordings do not exceed 15 FPS, nor is it possible to stream with OBS. With Mirilis Action it is possible to stream in high quality at 60 FPS, no matter the platform, it is fluid (tested with 8000Kbps upload and stream with 8GB Ram at 1600Mhz).
Pro The only software to record audio from selected application or game (not including unwanted sounds from the system)
Pro Recording webcam or USB/HDMI Capture Devices
Cons
Con Too complicated
This is extremely customizable, but extremely complex! If you want something simple and intuitive out of the box, stay away from ShareX.
Con Privacy concern
Can upload screenshots to web without you realizing, unable to delete or reverse process.
Con Scrolling window capture doesn't work always as expected
Sometimes might need to use another screen capture software to capture a scrolling page.