Signal
The privacy benchmark: encrypted by default, minimal metadata, fully open source, nonprofit. If privacy is the only priority, this is the pick.
Private messaging · comparison
Signal, WhatsAppor Telegram?
Three of the biggest messengers, judged only on what matters for privacy: is it encrypted by default, how much metadata it keeps, whether the code is open, and who owns it. No hype, just the differences.
Side by side
The privacy comparison.
What each app does by default, on the points that actually affect your privacy.
| Feature | Signal | Telegram | |
|---|---|---|---|
| End-to-end encryptionBy default, for all chats | Yes | Yes | No — only in opt-in "Secret Chats", not groups |
| Where messages liveStorage model | On your device only | On your device; optional cloud backup | Cloud by default (Telegram can access) |
| Metadata collectedWho, when, how often | Minimal | Significant (Meta ecosystem) | Significant |
| Open sourceAuditable code | Yes — client and server | Partial — protocol only | Partial — client only |
| Owner / modelBusiness incentive | Nonprofit foundation | Meta (ad company) | Private company |
| Requires phone numberTo sign up | Yes | Yes | Yes |
Indicative comparison based on each app's default behaviour; features and policies change, so check each provider. Signal generally rates highest on privacy; WhatsApp encrypts content by default but collects more metadata; Telegram is not end-to-end encrypted by default.
The takeaway
It comes down to defaults.
Strong content encryption by default, but it's a Meta product, so metadata about your habits is collected and linked across services.
Telegram
Popular and feature-rich, but regular chats are not end-to-end encrypted, they sit on Telegram's servers unless you use Secret Chats.
FAQ
Frequently asked questions.
By most privacy measures, Signal. It is end-to-end encrypted by default for everything, collects almost no metadata, is fully open source, and is run by a nonprofit. WhatsApp is E2EE by default too but is owned by Meta and collects more metadata. Telegram is not end-to-end encrypted by default.
Not by default. Regular Telegram chats are stored on Telegram's servers and are encrypted in transit and at rest, but Telegram can access them. End-to-end encryption is only available in opt-in "Secret Chats", which are one-to-one and not available for groups.
WhatsApp messages and calls are end-to-end encrypted by default using the Signal protocol, so the content is protected. The main concern is metadata: as a Meta product, it collects data about who you talk to, when and how you use it, which can be linked across Meta's services.
It combines E2EE by default, minimal metadata collection, fully open-source code that anyone can audit, and nonprofit governance with no ad business model. There is no incentive to monetise your data.
NOLO isn't a messenger, but it shares the same philosophy as Signal: collect as little as possible, keep data on your device, and don't build a profile of you. It is a private AI with no account, no tracking and no training on your chats.
Private messaging,
meet private AI.
NOLO shares Signal's philosophy: collect as little as possible. A private AI chat with no account, no tracking and nothing retained.