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Threema is a Swiss end-to-end encrypted messenger that lets you register anonymously without a phone number. The app is a one-time purchase of about CHF 3.99, has an open source client audited by ETH Zurich, and is the secure messaging choice for privacy-focused users and enterprises.
Founded in 2009 by Jan Koum and Brian Acton and acquired by Meta for $19 billion in 2014, WhatsApp has more than 3 billion monthly active users with default end-to-end encryption and WhatsApp Business and API services.
Tuta (formerly Tutanota), founded in 2011 in Hanover, Germany, is a pioneer in end-to-end encrypted email. Features the proprietary TutaCrypt encryption protocol, fully open source codebase, and a 1GB free plan.
Proton Mail was founded by CERN scientists in 2014, headquartered in Geneva, Switzerland. It is the world's most trusted end-to-end encrypted email service, offering free 500MB storage with 150 emails/day and paid plans with more features and storage.
WorkFlowy is an infinite-level outliner released in 2010 by a US team, known for Zoom focus and minimalist text. The free plan offers limited nodes and Pro costs about $4.99-9.99 per month, making it a pioneer of outline-based thinking.
Standard Notes is a privacy-first notes app from the USA, founded in 2012, built around end-to-end encryption (E2EE) and auditable open source. It syncs across iOS, Android, desktop and Web, supports extension editors and 2FA, and costs about $10 per month for paid plans.
Reflect is an AI-powered, end-to-end encrypted notes app combining Daily Notes, bidirectional links, and built-in AI summaries and Q&A at about $10/month, an Obsidian-style choice for privacy-conscious users.
Joplin is an open-source note and to-do app initiated in 2016 by French developer Laurent Cozic, supporting Markdown, end-to-end encryption and multi-platform sync with data servers in Paris, France (GDPR), 45,000+ GitHub stars, and optional Joplin Cloud from EUR 2.99/month.
Anytype is a local-first, offline-capable open-source knowledge management platform featuring end-to-end encryption and an object-relationship model, currently free, ideal for privacy- and data-sovereignty-focused users.
Skiff is an end-to-end encrypted, privacy-first email platform founded in 2020 in San Francisco, offering encrypted mail, document collaboration, and cloud storage in one integrated workspace. Acquired by Notion in 2024.
Wire is an end-to-end encrypted communication platform founded in Zurich, Switzerland in 2014, offering encrypted messaging, voice and video, with open-source core code and self-hosting support, adopted by German federal agencies.