When comparing A Photo Manager vs OI File Manager, the Slant community recommends OI File Manager for most people. In the question“What are the best file explorers on Android?” OI File Manager is ranked 9th while A Photo Manager is ranked 17th. The most important reason people chose OI File Manager is:
It asks only for Storage permissions. No other things are required.
Specs
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Pros
Pro Incremental photo backup to zipfile
i.e. all photos that where added/modified since last backup can be added to a zip file on an attached usbstick
Pro Support for virtual albums
... that are independant of locaton in the physical-filesystem.
Pro Powerful geotagging/openstreetmap integration
A map shows where photos where taken. if you zoom in you see more details. Geotagging: select one or more photos + "set geo" + pick a point in the map ==> the selected images get that point. Filter images through the map: after selecting an area in the map (i.e. North Germany), the gallery will only show images from North Germany.
Pro It is free
Open-source, no ads, no user tracking.
Pro Can handle big image collections
15000+ images in 1000+ folders.
Pro Find photos by tags (aka keywords)
Pro Build in Vault mode
If enabled only selected/filtered Images can be seen. This allows you to savley hand over your android phone to someone else and allow him/her to view only those images in Gallery-View, Geographic-Map and Image-View that you have chosen before.
Pro Exif-Tag support (Edit and Find)
Pro Quick hirarchical folder navigation
Only folders that contain pictures are shown.
Pro Few permissions
It asks only for Storage permissions. No other things are required.
Pro Lightweight
The app takes only a few seconds to download, as its size is only about 1.5 MB to download and installed (on MIUI) takes only ~6 MB full size.
Pro Open Source
OI File Manager is available for free under the Apache License 2.0.
Pro ZIP file extraction support
OI File Manager supports extracting ZIP files.
Cons
Con It is not available on the Google Play Store
You have to download it via f-droid.org store.
Con Only support for local photos
Con No additional features (suite)
No other features such as networking connections, junk flies cleaner, built-in media player/viewer/editor. But that might be a pro, since nothing else is asked for this app permission.
Con Outdated
At this moment I'm writing, it was updated last in 2017.
Con Ugly UI
The GUI is old and deprecated. But what would you expect for such a small app?