Privacy comparison · 2026
Signal vs WhatsApp
Signal and WhatsApp are often weighed against each other. This side-by-side compares how each protects you by default, whether the code can be inspected, who runs it, and how to pick the more private option.
Side by side
| Signal | ||
|---|---|---|
| Type | Messaging app | Messaging app |
| Default protection | End-to-end by default for all chats and calls | End-to-end by default for message content |
| Open source | Yes | No |
| Operator | Signal Foundation (non-profit) | Meta |
| Jurisdiction | United States (non-profit foundation) | United States (Meta) |
| Cost | Free | Free |
Signal
Signal encrypts every message, call and attachment end-to-end using the open Signal Protocol, which is also used under the hood by several other apps. The apps and the protocol are open source, and the Signal Foundation is funded by donations and grants rather than advertising.
Privacy strengths
- ✓Every chat, group and call is end-to-end encrypted by default
- ✓Open-source clients and protocol that can be independently audited
- ✓Stores very little metadata — no ad profile is built from your activity
- ✓Disappearing messages and per-chat controls are built in
Caveats
- !Requires a phone number to register (though usernames can hide it from contacts)
- !Smaller network than mainstream apps, so contacts may not be on it yet
WhatsApp uses the Signal Protocol to end-to-end encrypt message and call content for every chat by default. Because it is owned by Meta, it collects substantial metadata — who you talk to, when and how often — which can be shared across Meta’s services. The app itself is closed source.
Privacy strengths
- ✓End-to-end encryption of message content is on by default
- ✓Nearly everyone already has it, so contacts are easy to reach
- ✓Optional encrypted backups
Caveats
- !Owned by Meta and collects extensive metadata (contacts, timing, usage)
- !Closed source, so the encryption cannot be independently inspected
- !Metadata can be used across Meta’s wider ad ecosystem
Frequently asked questions
What is the difference between Signal and WhatsApp?
Signal: Signal is an end-to-end encrypted messaging app run by a non-profit foundation, designed to collect as little metadata as possible. WhatsApp: WhatsApp is a Meta-owned messaging app that end-to-end encrypts message content by default but collects metadata about how you use it.
Which is more private by default, Signal or WhatsApp?
Signal — End-to-end by default for all chats and calls. WhatsApp — End-to-end by default for message content. Choose based on which default matches how you use it.
Are Signal and WhatsApp open source?
Signal: yes, open source. WhatsApp: no, closed source.
Is Signal really private?
Signal end-to-end encrypts all messages and calls by default and is engineered to hold minimal metadata, which is why it is widely recommended by security researchers.
Is WhatsApp private if it is end-to-end encrypted?
Message content is end-to-end encrypted, but WhatsApp still collects metadata — who you message, when and how often — and is owned by Meta, which limits how private it is overall.
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