Independent reviews of messaging apps based on encryption protocols, metadata resistance, and actual privacy practices—not affiliate commissions.
| App | E2E Protocol | Metadata Resistant | Phone Required | Open Source | Jurisdiction | Verdict | Details |
|---|---|---|---|---|---|---|---|
| Signal | Signal Protocol | Yes | Yes | Yes | USA | Recommended | Visit Site |
| Session | Session Protocol | Yes | No | Yes | Australia | Recommended | Visit Site |
| Element (Matrix) | Matrix (Megolm) | No | No | Yes | UK | Conditional | Visit Site |
| Telegram | MTProto (Secret Chats only) | No | Yes | No | UAE / Dubai | Avoid | Visit Site |
Metadata resistance refers to whether the service minimises collection of who you talk to, when, and how often. Phone required means a phone number is needed to register.
Encryption should be on for all conversations automatically — not just a special "secret chat" mode you have to remember to enable. If the default is unencrypted, most users will never use the secure option.
Message content encryption is table stakes. The harder and more important problem is metadata — who you talk to, when, and how often. Look for apps that design specifically to minimise this.
The encryption claims of a closed-source app cannot be independently verified. Open-source code can be audited by security researchers, making it far more trustworthy.
A phone number links your messaging account to your real identity. Apps that allow registration without one — or let you replace it with a username — offer stronger anonymity.
Reputable messengers commission regular security audits from independent firms. These verify the implementation matches the claims — not just that the protocol is theoretically sound.
Messages that auto-delete after a set time limit the damage if a device is ever compromised. Look for apps where this can be set as a default, not just per-conversation.
Telegram's regular and group chats are not end-to-end encrypted. They are stored on Telegram's servers and can be accessed. Only one-on-one "Secret Chats" use E2E. This is a fundamental design decision, not a bug — but Telegram's marketing obscures it.
WhatsApp uses the Signal Protocol for message encryption, but it's owned by Meta, collects extensive metadata, backs up chats to cloud by default (unencrypted), and its closed-source code cannot be independently verified.
iMessage is end-to-end encrypted between Apple devices, but falls back to unencrypted SMS when messaging Android users. iCloud backups also contain unencrypted messages unless Advanced Data Protection is enabled.
The more people in a conversation, the higher the risk of a compromised device or account. Even with perfect encryption, a group is only as secure as its least secure member.
For most people: Signal is the best choice — widely trusted, easy to use, and your contacts likely already have it.
If you need no phone number: Session is the strongest option for anonymity.
If you or your organisation wants self-hosted, federated messaging: Element/Matrix is the most flexible.
Enable disappearing messages by default — Signal lets you set this globally in settings.
Enable registration lock (Signal) to prevent someone from re-registering your number.
Verify safety numbers with important contacts to confirm you're not being intercepted.
The biggest challenge with secure messaging is getting the people you talk to onto the same app. Start with your most important contacts.
Signal's Note to Self feature is useful for storing your own private notes while you transition.
You don't have to delete WhatsApp immediately — use Signal for sensitive conversations while migrating gradually.
Signal now supports usernames, meaning you can share a username instead of your phone number with contacts. Your number is still required to register, but you can use a VoIP number or a secondary SIM to limit exposure. For most people's threat model, this is acceptable.
Because regular Telegram chats — including all group chats — are not end-to-end encrypted. They are stored on Telegram's servers in a way Telegram can access. This is a fundamental architectural decision. It's a fine app for non-sensitive communication, but it is not a secure messenger.
No — Signal requires a phone number to register, and the desktop app is linked to your phone account. Session does not require a phone number and has a standalone desktop client.
For most private conversations, a secure messenger like Signal is far better than encrypted email. Signal protects metadata, has disappearing messages, and is much easier to use. Email — even encrypted — exposes who you communicate with and when.
The message encryption is technically sound (Signal Protocol), but Meta collects extensive metadata, the code is closed-source, and cloud backups are often unencrypted. For casual privacy it's a step up from SMS. For genuine privacy needs, use Signal.