WhatsApp and Signal are both encrypted messaging apps, but they differ sharply in privacy, features, and ownership. The table below summarizes the main differences, and the rest of this article explains what each difference means for you.
| Feature | Signal | |
|---|---|---|
| Owner | Meta (Facebook) | Signal Foundation (non-profit) |
| Encryption | End-to-end (Signal Protocol) | End-to-end (Signal Protocol) |
| Metadata collection | Extensive (phone number, contacts, usage patterns, IP, device info) | Minimal (phone number, last connection date, account creation date) |
| Open source | Client partially, server proprietary | Fully open source |
| Default backup | Cloud (Google Drive/iCloud) – not end-to-end encrypted | Local (encrypted with a passphrase) |
| Desktop app | Yes (requires phone linked) | Yes (requires phone linked) |
| Group calling | Up to 32 participants | Up to 40 participants |
| Disappearing messages | Yes (24h, 7d, 90d) | Yes (5s to 4 weeks, plus custom) |
| Stories/Status | Yes | No |
| Business features | Yes (WhatsApp Business) | No |
Background and Ownership
WhatsApp was founded in 2009 and acquired by Facebook (now Meta) in 2014 for $19 billion. It has grown to over 2 billion users worldwide, making it one of the most popular messaging apps. Signal, on the other hand, was created by the Signal Foundation, a non-profit organization founded by Moxie Marlinspike and Brian Acton (a WhatsApp co-founder who left Facebook). Signal is funded by grants and donations, not by selling user data.
How Encryption Works
Both apps use the Signal Protocol, which provides end-to-end encryption. This means that messages are encrypted on your device and only decrypted on the recipient’s device. Neither the service provider nor anyone in between can read them. However, the difference lies in what else the apps collect. WhatsApp collects a significant amount of metadata—information about your communication, not the content itself. This includes your phone number, contacts, IP address, device model, and usage patterns. Signal collects only your phone number and the last time you connected. This metadata is crucial because it can reveal who you talk to, when, and from where, even if the content is private.
Open Source and Transparency
Signal is fully open source: its code is publicly available for anyone to inspect, which allows security researchers to verify its claims. WhatsApp’s client is also open source, but its server code is not. This means that while the encryption on WhatsApp is generally considered secure, the company’s data handling practices are not fully transparent. For privacy advocates, open source is a major trust signal.
Backups and Data Storage
WhatsApp offers cloud backups to Google Drive or iCloud. These backups are not end-to-end encrypted by default, meaning that if someone gains access to your cloud account, they could read your messages. Signal, in contrast, only offers local backups that are encrypted with a passphrase. This is more secure but less convenient—you have to manually back up and restore, and if you lose your phone without a backup, your messages are gone.
Features and Usability
WhatsApp has a richer feature set: status updates, business accounts, payments (in some countries), and a larger group calling limit. Signal is more minimalist, focusing on core messaging with a few privacy-enhancing features like disappearing messages with custom timers and screen security. Signal also lacks a web client; its desktop app requires your phone to be connected, just like WhatsApp.
How to Choose
- Choose WhatsApp if: you need to communicate with a large network of contacts, use business features, or rely on cloud backups.
- Choose Signal if: you prioritize privacy and metadata minimization, want open-source transparency, or need secure local backups.
Common Problems and Misconceptions
A common myth is that WhatsApp is not encrypted at all. In fact, it uses the same encryption as Signal. The real issue is metadata and backups. Another misconception is that Signal is only for tech-savvy users—it is actually quite user-friendly. However, Signal has a smaller user base, so you may need to convince your contacts to switch.
Frequently Asked Questions
Is Signal really more secure than WhatsApp?
Signal is generally considered more secure because it collects far less metadata and is fully open source. However, the encryption itself is equally strong in both apps.
Can I use both apps on the same phone?
Yes, you can install both and use them simultaneously. They are separate apps and do not interfere with each other.
Does WhatsApp share my messages with Facebook?
No, the content of your messages is end-to-end encrypted and cannot be read by Facebook. However, WhatsApp shares metadata with Facebook for advertising and analytics purposes.
Which app is better for privacy?
Signal is better for privacy due to its minimal data collection and open-source nature. If privacy is your top priority, Signal is the clear choice.
Are there any costs?
Both apps are free to use. Signal is funded by donations, while WhatsApp is free but monetizes through business features and data sharing.
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