It is a lightweight, folder based photo viewer for Mac, having simplicity as its core feature. It has a free version, and a paid $5 version with more features.
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Pro The FREE version has no basic functionality limits
Most of the premium features are about advanced filters, more presets and more image manipulation tools, but the free version is perfectly functional, with no time limits.
Pro It handles all picture file formats, but also most video and audio formats
It will handle both the standard formats, like png, jpg, bmp, gif, tiff and camera, and the RAW formats like crw, cr2, dng, eip, erf, nef, nrw, obm, orf, pef, raw. It can also handle many video formats: mp4, m4v, m4u, m4a, mkv, mov, and audio formats as well: opus, weba, webm, ogg, ogm, oga, wav, mp3, flac, m4v, acc.
This app is really fast, and not encumbered even when it encounters folders with thousands of photos.
Con It lacks sophistication
A lot of filters, presents, and functions available in more sophisticated viewer programs are lacking here. It is recommended to check out the free version first to see if it suits your needs before upgrading to the paid version.