What's the alternative?

Compare FastStone Image Viewer VS XnView

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External Review References
These are some of the sources we've used to compare FastStone Image Viewer and XnView
FastStone Image Viewer Reviews
7 Best Photo Viewer Apps for Windows 10 in 2019
FastStone Image Viewer is often appreciated for its in-built image editor and interface to manage the photos. The image editor is quite handy as you can do minor edits and quick fixes like cropping, resizing, red-eye removal, etc.
8 Best Photo Viewer for Windows 10 (2018)
The FastStone image viewer is a free windows based image viewer and supports many languages as well. It has a slideshow with many attractive transition effects.
Source: techwiser.com
XnView Reviews
7 Best Photo Viewer Apps for Windows 10 in 2019
XnView is one of the best alternatives to the Windows Photos app. It has all the required features like slideshow, screen capture, etc. It’s easy to manage your photos on XnView.
8 Best Photo Viewer for Windows 10 (2018)
When looking for an image viewer it’s always a perk if you get additional features right? Initially supporting Unix systems as well, Xnview now only supports Windows Systems and offers not just an image viewer but an organizer and editor too. XnView is a robust software and supports multiple languages.
Source: techwiser.com