Phostow is described as 'Google Photos alternative that magically keeps all of your photos backed up to wherever there's space on your devices, avoiding expensive cloud photo storage' and is an app in the Backup & Sync category. There are more than 50 alternatives to Phostow for a variety of platforms, including Android, iPhone, Online / Web-based, Windows and Mac. The best alternative is Nextcloud, which is both free and Open Source. Other great apps like Phostow are Google Photos (Freemium), Simple Gallery (Free, Open Source), Flickr (Freemium) and Seafile (Freemium, Open Source).
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Google Photos is a photograph and video sharing and storage service by Google. It allows the users to store and share images and videos using the 15 GB free storage space of their Google Account or a Google One subscription.
Simple Gallery is a highly customizable offline gallery. Organize & edit your photos, recover deleted files with the recycle bin, protect & hide files and view a huge variety of different photo & video formats including RAW, SVG and much more.
PhotoPrism® is a privately hosted app for browsing, organizing and sharing your personal photo collection. It makes use of the latest technologies to automatically tag and find pictures without getting in your way.
ACDSee is a complex, multi-purpose application that serves for viewing, organizing and editing digital photos. Furthermore, images can be shared on social websites or your own space on the developer’s website.