
Google Photos
8.3#1 in photo scanning softwareFree planFree planAndroidiOSWebAPI
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Google Photos suits people who want cloud backup and organization across mobile and desktop devices. It can also suit households sharing storage, though paid plans and the free allowance span Google Photos, Gmail and Drive.
Tonfotos suits people who want to organize family photo archives kept on a PC, NAS or removable drive. Its family-tree and people-search features may be useful for documenting relationships across a collection.