What it does
Session is a free encrypted messenger built to work without a phone number, an email address, or any other piece of real-world identity. Instead of a central server matching your phone number to your contacts, Session generates a random cryptographic ID that you share with people directly (or via a QR code).
Messages are end-to-end encrypted and relayed through a decentralised network of community-run "service nodes" rather than a single company's servers, so no single operator sees who is talking to whom the way a conventional messaging company would.
The app covers the basics people expect from a modern chat app:
- One-to-one and group conversations
- Voice messages
- File and image attachments
- Disappearing messages
- Voice calls
It runs on iOS, Android, Windows, macOS and Linux, with conversations syncing across devices tied to the same Session ID.
Who runs it
Session was originally built by the Oxen Privacy Tech Foundation in Australia. In 2024, citing "increasingly restrictive privacy and surveillance legislation" at home, the project's stewardship moved to a newly created Swiss non-profit, the Session Technology Foundation ("Session Technology Stiftung"), which now coordinates development, protocol work and grants from Switzerland. The foundation has no shareholders and describes its mission as protecting "robustness through decentralisation, privacy through encryption, and choice through interoperability" — details it publishes itself at session.foundation.
Who should use it
Great fit if…
- You want to message contacts — friends, family, activists, journalists and sources, community groups — without that conversation being linkable to a phone number tied to your legal identity.
- You're comfortable managing your own backup of a recovery phrase — there's no account recovery via a phone carrier or email provider.
- You're starting a new, compartmentalised identity for a specific conversation — a support group, a whistleblowing contact, an anonymous community — rather than looking to fully replace every chat you already have, since most of your existing contacts won't be on it yet.
Skip it if…
- You want a single app for calling family members abroad with reliable video.
- You need enterprise features like managed device policies — Session is a personal, individual-account tool, not a business communications platform.
Pricing in detail
Session has no price. There is no premium tier, no ad-supported free tier with a paid upgrade, and no in-app purchase — the client apps and the underlying network are entirely free to use. The Session Technology Foundation funds development through grants and public donations rather than venture capital; its own site states the foundation "can't continue without" donor support and links directly to a donation page. In mid-2026 the foundation publicly confirmed it had secured enough funding to continue operating after a funding shortfall earlier in the year, which is worth knowing if you're relying on the project for the long term: like many donation-funded non-profits, its runway isn't guaranteed years in advance the way a subscription business's is.
Because there's no paid plan to evaluate, "value for money" here really means: is a donation-funded, foundation-run messenger a stable enough foundation for your conversations? Its open-source codebase means that even if the foundation folded, the protocol and clients could in principle be forked and kept alive by others — which isn't true of a closed commercial app.
Where it falls short
- Contact discovery is manual — you exchange Session IDs or QR codes, with no "find friends from your address book" feature; a deliberate privacy choice, but it means onboarding a group chat takes more effort than on apps built around your phone's contact list.
- Delivery can feel a beat slower than a centralised messenger, particularly for voice calls, because messages are relayed through a network of independently operated service nodes rather than a single fast data-centre.
- The desktop and mobile apps are functionally solid but visually plainer than most mainstream chat apps, and there is no official web client.
- Support is community- and documentation-based — no live chat or phone support, and no company can reset your account if you lose your recovery phrase.
Privacy & data
Session's core design goal is minimising metadata, not just message content. Messages are end-to-end encrypted, and because there's no phone number or central account database, there is structurally less personal data for anyone — including the foundation — to hand over even if compelled to. Routing messages through multiple service nodes is meant to make it harder for any single node operator to see both who is sending a message and who is receiving it.
The client and protocol code are open source and published on the foundation's repositories, so the encryption and routing claims can be independently audited rather than taken on faith, which is not something you can say about most mainstream messaging apps.
How we checked this
We reviewed the current stewardship and legal structure directly from the Session Technology Foundation's own site (session.foundation), which confirms it as a Swiss foundation without shareholders, and cross-checked the 2024 relocation history and pricing model (fully free, donation-funded, no paid tier) against the project's public documentation. We found no evidence of any commercial ownership stake, venture investor, or non-European corporate parent controlling the foundation or the app today.