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Aer vs DroidFS: catalog facts
Aer	DroidFS
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the AGPL-3.0.
Android	Android
Keeps files out of other apps' view Can store private files on an SD card	Compatible with gocryptfs and CryFS vaults Vault contents stay unreadable to other apps
Still in development, with a warning about possible data loss Android only	Only gocryptfs and CryFS are supported Files must be opened through the app's own explorer
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0-only
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.