Encryption

Available on web, iOS, Android, and desktop, Proton Mail is an encrypted email service that offers free accounts.

Safe Notes is an encrypted private note manager, providing a place to keep written information in protected form.

Proton Meet provides video calls with privacy protections from the creators of Proton Mail, supporting online meetings.

Search the MIT PGP public key server for keys by email address or name, then retrieve the matching public key.

This community guide collects recommendations for improving security and privacy on macOS.

Open Android Backup provides a cross-platform script and app for local device backups, with encryption and compression.

Use a YubiKey challenge-response at system startup to open a LUKS-encrypted disk volume.

The Hemmelig.app project shares encrypted secrets to help keep sensitive information out of chat logs, email, and similar channels.

wormhole-crypto provides streaming encryption for Wormhole.app using encrypted content encoding for HTTP.

Standard Notes provides end-to-end encrypted notes, with a free download and pricing details on its page.

NordLocker provides encrypted cloud storage and a private file vault for securing, backing up, accessing, and sharing files across devices.

Burn My Note creates encrypted notes that self-destruct after reading, with optional password protection and configurable expiration times.

Swift Backup backs up Android apps, messages, call logs, and other device data.

GnuPG implements the OpenPGP standard and provides tools to encrypt and sign data and communications, with key management and directory access.

Peergos provides end-to-end encrypted storage, file sharing, and sync while also protecting file metadata and sharing relationships, per its site.

Tuta is an email service whose repository says it encrypts emails, contacts, and calendar entries across users’ devices.

Pilot Protocol describes a network that connects AI agents across a shared ecosystem.

Internxt offers encrypted cloud storage using zero-knowledge technology, with additional products listed for VPN, antivirus, cleaner, and mail.

OneTimeSecret creates self-destructing links for sharing passwords and other sensitive information; the page also describes self-hosting.

Tuta offers encrypted email, calendar, and contacts, with apps that the site says protect personal data using end-to-end encryption.

Koofr provides web, desktop, and mobile file access, supports WebDAV and Rclone, and can connect Dropbox, Google Drive, and OneDrive accounts.

Yopass encrypts secrets in the browser and creates one-time links that expire, providing a way to share sensitive information without accounts.

This Android personal finance app is described as local-first, encrypted, self-hosted, and able to sync across devices.

KeyNote NF offers a tabbed notebook with a rich-text editor, nested notes, and encryption, according to its project description.