How much data does your favorite messaging app collect? New study shows 90% of messaging apps now include AI that puts privacy at risk
- Nine out of the top 10 messaging apps offer end-to-end encryption, but 90% now feature AI tools that could expose your private data.
- Signal ranks as the most private messaging app, utilizing quantum-secure cryptography and collecting only your phone number.
- Meta’s Messenger and LINE rank among the worst offenders for aggressive data harvesting, collecting vast amounts of user information for advertising and tracking.
We trust messaging apps with our most intimate conversations, from sharing passwords with family members to venting about our bosses. However, while we naturally assume our private chats are staying private, a disturbing new analysis reveals that your favorite app could be harvesting your data right under your nose.
A recent study by cybersecurity firm Surfshark took a magnifying glass to the 10 most popular iOS messaging apps of 2025. The researchers looked past basic marketing promises, examining encryption standards, data collection practices, and the creeping introduction of artificial intelligence features.
The good news is that basic security is becoming an industry standard. 9 out of the 10 apps analyzed provide end-to-end encryption (E2EE), meaning nobody, not even the app developer, should be able to intercept and read your messages.
If you combine a secure messaging platform with a reliable VPN to encrypt your wider web traffic and hide your IP address, your daily communications are generally safe from prying eyes.
However, the bad news is that aggressive data collection and poorly implemented AI integrations are quietly undermining these encryption efforts.
The best (and worst) messaging apps for your privacy
When it comes to treating your data with respect, the messaging market is sharply divided. Surfshark evaluated 35 specific data types listed in the Apple App Store to see exactly what these companies are scooping up.
The best: Signal
With an exceptional privacy score of 0.99, Signal easily takes the crown. It avoids user tracking entirely and only collects one piece of data: your phone number.
Alongside Apple’s iMessage, Signal is also one of the only apps to offer quantum-secure cryptography, future-proofing your messages against next-generation cyber threats.
The worst: LINE and Messenger
On the other end of the spectrum, LINE ranks at the absolute bottom with the lowest privacy score. Both LINE and Meta’s Messenger are notorious for their data-hungry practices.
While the average messaging app collects 17 data types, Meta’s Messenger collects a staggering 32 out of a possible 35 data types.
Furthermore, 30 of those data types can be exploited for purposes completely unrelated to the app’s functionality, such as targeted advertising and product personalization.
The stragglers: Discord and Rakuten Viber
Discord stands out as the only app in the study that completely fails to provide end-to-end encryption for text-based messages. Along with LINE and Rakuten Viber Messenger, Discord is also one of the few platforms that actively collects data specifically for user tracking.
The growing risk of AI in your private chats
While encryption keeps hackers out, the widespread adoption of AI tools is creating entirely new vulnerabilities. A staggering 90% of the messaging apps analyzed by Surfshark now offer some form of AI integration.
Whether it’s a virtual assistant summarizing a long chat or an AI bot translating a message, these features require access to your conversational data. You aren’t just talking to a helpful virtual friend; you are feeding data directly back to the service provider.
Highlighting this threat, researchers from New York University and Cornell University warned in the Surfshark report that “AI features are being developed at a rapid pace, raising significant security risks for users of E2EE applications”.
Ultimately, technology can only protect you so far. The FBI and the Cybersecurity and Infrastructure Security Agency (CISA) recently issued warnings about phishing campaigns specifically targeting secure platforms like Signal.
If a hacker tricks you into handing over your login credentials, no amount of quantum-secure encryption will keep your contact lists and private messages safe.
Want to know more? You can read the full Surfshark report here
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