WhatsApp is one of the most widely used messaging apps, but it's not the most secure, and certainly not the one that best respects your privacy . Despite being touted as one of the most secure due to its encryption system, it's important to remember that this app is free and belongs to Meta (formerly Facebook), meaning they are using your data as clearly stated in the license agreements that no one seems to read. Furthermore, the claim that conversations are secure and inaccessible has been a charade, as we've already seen them accessed in several high-profile cases.
For all these reasons, in this article, we review the best instant messaging apps in terms of security and respect for user privacy:
Threema
Threema is one of the most secure and privacy-conscious instant messaging apps. In fact, it's recommended for use by some European governments and the Swiss military . While it's a paid app, it's quite affordable, and in return, you get an open-source, transparent app with end-to-end data encryption and complete respect for privacy and anonymity. Furthermore, all data is stored on servers within Europe, which is a guarantee of security.
Threema uses some of the strongest encryption available , with a reliable cipher library like NaCl, which is also open source to prevent backdoors like those found in other supposedly robust systems. Encryption keys are generated and securely stored on the user's device. No registration is required, just a randomly generated ID, and there are no ads or data tracking.
In terms of features, it's one of the most complete messaging apps :
- Function to create polls
- Make voice calls
- Make video calls
- Write and send text messages and voice memos
- Sending files of any type (MP3, DOC, MP4, ZIP, PDF,...)
- Creation of chats or groups
- Visual themes with dark mode
- Data sync (optional)
- Identity verification with personal QR code
Signal
Signal is another instant messaging app that ranks among the best when it comes to user security and privacy. It's free and allows for confidential communication with end-to-end encryption to maintain chat privacy. It's very fast, with no strings attached, no tricks, no ads, no trackers, and it's non-profit.
This app is used by millions of users worldwide, and it's very rich in options :
- Creation of chats and groups
- Function to write text and voice notes
- Video calls and VoIP calls
- Dark mode
- Ability to configure and customize alerts
- You don't need too much data for access, just your phone number and little else
- It allows you to send images, with integrated tools to edit, crop, rotate, etc.
Telegram
Of course, one of the best alternatives to WhatsApp, considering both user numbers and app quality, is Telegram. It surpasses WhatsApp in many features. That's why it's one of the most popular messaging apps, with over 500 million active users. It's fast, easy to use, allows cloud synchronization of messages for access from anywhere, and doesn't require you to expose your phone number (you can use a nickname) or have an associated phone number, so you can connect from another client on any device.
It's unlimited to use and completely free . You'll never lose conversations. And the most notable features are:
- Management of chats and groups, as well as very practical channels for dissemination
- Capacity for voice calls, video calls, text messages, emojis, GIFs, stickers, etc.
- Possibility of deleting messages both for yourself, for you and for the recipient.
- Editor for messages, in case you make a mistake or regret the message sent.
- Integrated image editor
- Ability to send all types of files
- Private chats that self-destruct over a period of time in the sender's and recipient's app
- Access password (optional)
- Symmetric encryption with 256-bit AES algorithm, and 2048-bit RSA encryption combined, as well as Diffie-Hellman secure key exchange for military-grade security.
- It is 100% free and open source, with APIs for developers
- Possibility of using bots
- Reliable
Wire
Next on the list of messaging apps is Wire. A kind of secure messenger with robust encryption , it offers voice calls, chat, file sharing, drawing editing, group communication, video calls, voice notes, and much more. Everything can be used from any device, thanks to its synchronization feature that lets you access your chats wherever you are.
Another important point is that it doesn't require any personal data; you simply use a username and don't have to share your phone number with your contacts, unlike Telegram. The only information registered in the app is your phone number and email address, which serves as your identifier. Furthermore, it's open source. Its design is excellent for teamwork, and it also allows you to delete and edit messages if they contain errors, similar to Telegram—something WhatsApp doesn't offer.
Wickr me
Finally, another top secure instant messaging app is Wickr Me. It might not be the most well-known or widely used, but it's quite good . It allows you to communicate in one-on-one chats or in groups of up to 10 people, with end-to-end encryption even for voice calls. It also lets you share files, images, videos, voice notes, and more.
You don't need a phone number or email to register, protecting your privacy and anonymity. Your data won't be stored on the service's servers, and it doesn't collect any metadata associated with your communications. It's also open-source and transparent, and highly configurable, although if you're looking for something similar to Telegram or WhatsApp, this app might have some limitations that you might miss.
