Session - Private Messenger

Review by eFreeware

Most messaging apps ask for a phone number before you can say hello to anyone. Session does not. The account starts with an ID rather than a SIM card, and the whole service runs on a decentralized network of servers operated by users around the world. That single design decision shapes everything else about the app.

Session is built for people who treat their conversations as private by default and would rather not hand a phone number or email address to a messaging company. It is free, it carries no ads, and the Session Foundation, a Swiss organization focused on digital rights, stewards it. If you have ever hesitated before installing a chat app because of what it wanted from you at sign-up, this is the pitch.

Messages that travel without a central ledger

The core experience is ordinary in the best sense: you send messages, share photos, record voice snippets, pass along files and talk in groups. The difference sits underneath. Conversations are end-to-end encrypted, and the developer says routing is encrypted too, so the path a message takes is protected alongside its contents.

Group chats support up to 100 people, which covers family threads, friend circles and small work teams without much strain. The network itself is decentralized, made up of servers run by users spread across the world. There is no central store of everyone's conversations sitting in one place, which is the failure point that turns a single breach into a very large one elsewhere.

The developer also promises that metadata is not logged or tracked, and that your device's IP address stays hidden from both the person you are talking to and the servers holding your data. Those are the claims that matter most for a messenger, because metadata is what usually survives even when message contents are encrypted.

Signing up with an ID instead of a phone number

Creating an account needs no phone number and no email address. You get an Account ID, and that ID is what you share with people you want to talk to. For anyone who has watched a messaging app quietly match them to a contact list, this is the part that stands out.

It also changes how you add people. A phone number is easy to pass along and easy to remember; an ID is neither, so the first exchange with a new contact takes a little more care. That is a direct consequence of the privacy model rather than a flaw in it, and it is the trade most people will notice first.

The upside is that the account is not tied to a carrier, a SIM or an email provider. Nothing about your identity on the service depends on a third party holding a record of you.

Attachments, groups and the everyday parts

Beyond text, Session handles voice snippets, photos and files, all carried over the same encrypted setup as the messages themselves.

The project is open source, and the code is published on GitHub for anyone who wants to build it from source, inspect it or report a bug. For a privacy tool, that transparency matters more than a feature checklist. It means the claims about encryption and data handling can be examined by people who know what to look for, not just taken on faith.

The app is free to use and carries no ads. In-app purchases are offered, and the developer describes the project as free from trackers and surveillance. I would treat the purchase option as a separate matter from the messaging itself, since no feature appears to depend on spending.

What the privacy model asks of you

The costs here are structural rather than accidental. A decentralized network of user-run servers is a different beast from a single company's data center, and the developer's own framing makes clear that the specialized network exists specifically for private messaging. That is the source of the privacy guarantees and also the reason the app works the way it does.

The ID-based account is the clearest example. A contact list will not surface everyone you know. Inviting someone means sending them your ID through some other channel first. For a close circle of friends or family, that is a one-time inconvenience. For someone who wants to be found by acquaintances without effort, it is friction on every new conversation.

Anyone weighing Session should also think about what they are moving away from. Group chats cap at 100 people, and the app is a messenger rather than a social platform, so it is not trying to replace feeds, channels or communities. It is aimed at conversations between people who already know each other.

Suited to a small, deliberate contact list

Session fits people who want their messaging to carry as little identifying information as possible and are willing to do a bit of work to get there. Journalists, organizers, researchers and anyone whose conversations carry real risk are the obvious audience, and so are ordinary users who simply dislike the idea of a phone number being the key to their chat history.

It also suits households and small groups who want one private thread without a platform in the middle. The 100-person group limit is generous for that use, and the attachment support means photos and voice notes travel the same way as text.

Where it asks more of you is in reach. If your contacts are scattered across several apps and you expect them to follow you, the ID exchange is the hurdle. The people who get the most from Session are those who can bring their circle with them, or who only need a handful of conversations that stay private.

A private messenger worth the extra step

Session has been on Google Play since February 2020 and now sits above five million installs with a 4.7 average from more than 37,000 ratings, which suggests a settled, widely used app rather than an experiment. It is free, ad-free and open source, and the developer's privacy claims are specific enough to be worth taking seriously.

The recommendation depends on what you want from a messenger. If you want encrypted conversations, group chats up to 100 people, voice and file sharing, and an account that does not begin with your phone number, Session is a strong choice and the extra step of exchanging an ID is a fair price. If your priority is being instantly findable by everyone in your contacts, the same design will feel like a chore.

For my part, the appeal is the coherence of it. Every feature points the same direction, and the foundation behind it, the open code and the decentralized network, are all part of one argument. That is a rarer thing in a messaging app than it should be.