Before any comparison, a clarification to avoid wasting time: the applications in this guide are messengers. They are for communicating with people you already know — family, friends, colleagues, work groups, communities you're already part of. They are not apps for meeting new people, and using them with that expectation leads to guaranteed frustration.
Once the alignment is complete, the question that really matters, and which almost no list answers, remains: What is the concrete difference between them? Not in terms of the number of stickers, but in what can be verified — who can read your messages, what happens to the backup, how much information about you remains with the company even without reading the content, and how far the groups go. That's the comparison you'll find here.
End-to-end encryption: what it is and what it doesn't protect.
End-to-end encryption means that the message is scrambled on your device and only unscrambled on the recipient's device. Along the way, not even the service's server can read the content — it transports a sealed packet.
It's a real and important protection. But it has limitations that almost no one explains:
- It doesn't hide who spoke to whom. The server still knows that two numbers exchanged messages, when, and how often. This is metadata, and metadata is not encrypted.
- It does not protect the device. If someone gains access to your unlocked phone, they can read everything. Encryption protects the device, not the screen.
- It does not prevent screenshots. The recipient can keep and pass on whatever they want.
- It can be reversed by a backup. This is the most common type of hole, and it deserves its own section below.
- It's not always connected. It exists in several services, but only in specific modes that you need to activate conversation by conversation.
The main messengers, compared based on what can be verified.
1. WhatsApp – Android, iOS, Web and desktop
Cryptography: End-to-end by default, in all individual and group conversations, as well as voice and video calls. No activation is required.
Backup: This is the point to consider. The backup goes to your phone's cloud service and, historically, fell outside the scope of end-to-end encryption. Today there is the option to... end-to-end encrypted backup, Protected by a password or key — this needs to be activated by you in the chat settings.
Metadata: It requires a phone number and works from your contact list. It's the list service that most relies on this connection.
Groups and calls: Groups of up to 1,024 participants and video calls with dozens of people.
In short: The best combination of standard security with the crucial fact that everyone's already there. Enable two-step verification and encrypted backup, and it's good to go.
2. Telegram – Android, iOS, Web and desktop
Cryptography: Herein lies the most widespread misunderstanding in this category. Regular Telegram conversations—the ones that appear on all your devices at once— They are not end-to-end encrypted.. They are encrypted between you and the server, and are stored on the server, which is precisely what allows you to open the same conversation on any device. End-to-end encryption only exists in... secret conversations, which are individual and are attached to a single device. Groups and channels are never end-to-end.
Backup: This doesn't apply in the same way, because the history already lives in the service's cloud by default.
Metadata: Registration by phone number, with the option to use a public nickname and hide your number from others — a useful feature for participating in large groups without exposing yourself.
Groups and files: It is the champion of scale, with groups of up to 200,000 members, channels with no follower limit, and the ability to upload very large files.
In short: Excellent for community, channels, and file transfer. For private conversations, use Secret Chat—or another app.
3. Signal – Android, iOS and computer
Cryptography: End-to-end connectivity by default across everything — messages, groups, voice and video calls. The protocol is open, auditable, and the same one adopted by other messaging apps.
Backup: There is no automatic cloud backup by default. On Android, there is a local backup protected by a security phrase that you save—if you lose the phrase, you lose the history. It's inconvenient on purpose: there is no readable copy outside of your device.
Metadata: That's the real differentiator. The service is operated by a non-profit organization, and the system design minimizes what is stored—in practice, little more than the registered number and the date of the last connection.
Groups: Group calls and group chats use the same encryption as individual conversations.
In short: The choice for those who prioritize privacy over convenience. The obstacle is never technical, it's social — it only works if the other person also uses it.
4. Discord – Android, iOS, Web and desktop
Cryptography: text messages and direct messages They are not end-to-end.; The data is stored on the platform's servers, which allows for searchable history, moderation, and bots. Voice and video calls now feature end-to-end encryption.
Backup: Everything is hosted on the server by default, accessible from any device.
Metadata: Registration is via email, without requiring a phone number — although phone verification is requested in several communities.
Groups: The structure is unlike any other: servers divided into text and voice channels, with roles, permissions, and always-open voice chat rooms.
In short: Unbeatable for community use and continuous voice conversation. It's not the place for sensitive topics.
5. WeChat – Android, iOS and Web
Cryptography: It does not offer end-to-end encryption.
Metadata and legal context: The company operates under Chinese law, which imposes data retention and content moderation obligations on platforms. This is the most important factor in the evaluation, and it is independent of the app's quality.
Features: It functions as a complete platform — messaging, payments, services, mini-apps — and is dominant in China, making it practically mandatory for anyone with professional or family ties there.
In short: Use it if you need to talk to someone who is only on it, and treat the conversations as if they weren't private.
Everyone's blind spot: backups.
This is the detail that, in practice, negates much of the protection people think they have. An end-to-end encrypted conversation can be copied, in readable text, to your phone's cloud—and from then on it is no longer protected by the messenger and depends solely on the security of your cloud account.
What to do, in order of importance:
- Enable encrypted backup. Where the app offers it, keep the password or key in a safe place — without it, no one can recover anything, not even support.
- Protect your cloud account. With a strong password and two-step verification, she opened the back door to your chat history.
- Decide if you want a backup. Not having a backup is the most private and riskiest option: if you lose the device, you lose everything. It's a conscious choice, and everyone makes their own.
Metadata: what the service knows even without reading anything
Even with perfect encryption, the service records elements such as: your phone number or email address, who you exchange messages with, times and frequency, your groups, the device model, the network address and, depending on the service, your entire contact list.
To verify this for yourself without relying on any article, there is a verifiable way: the section “"Data security"” on the Play Store and the privacy labels on the App Store. Both are statements from the developer about what data is collected and what is linked to your identity. Comparing two messaging apps on these screens is the most honest test there is—and it takes two minutes.
How to choose based on your specific case.
- Talk to everyone in Brazil: In practice, WhatsApp. The network is the resource, not the application.
- Sensitive topic: Signal, or secret chat on Telegram.
- Large community, channel, promotion: Telegram.
- Study group, game, continuous voice: Discord.
- Contact with China: WeChat, no illusion of privacy.
- Work: Use the company's corporate tool, not your personal messenger — separation protects both sides.
Adjustments that apply to any messenger.
- Two-step verification enabled. This is what prevents someone from taking over your account using the six-digit code.
- Never share the six-digit code. No legitimate person asks for money. Whoever asks is using your account to solicit money from your contacts.
- Check the connected devices. All apps have this list. Close sessions that you don't recognize.
- Adjust who can add you to groups. And who sees your photo, your status, and your last seen time.
- Enable password or biometric lock within the app itself, if it offers that option.
- Turn off automatic media downloads. It saves space and avoids automatically saving incoming group messages.
- Check the permissions. Messenger requires a camera, microphone, contacts, and files. It does not need background location services.
Common Care or Mistakes
- To assume that every Telegram conversation is end-to-end: Only secret conversations are. That's the most common misconception in this category.
- Leave the backup unencrypted: This negates a significant portion of the app's protection.
- Reuse password: A data breach on any website becomes a breach of your cloud account, which stores your backups.
- Install modified version: "Mods" with extra features require installation outside the store, break the app's security, and can lead to account banning.
- Sharing personal data in an open group: A large group is a public space, with strangers reading everything.
- Ignore security warning: Notifications about new logins or changes to your phone number exist precisely so that you can react immediately.
Interesting Alternatives
- Facebook Messenger: Integrated into the social network, with end-to-end encryption available in conversations.
- Google Chat: Linked to Gmail and Workspace, it makes sense for those already living within that ecosystem.
- Slack and Microsoft Teams: Work tools, with a history managed by the company — and it's good to remember that, in a corporate environment, the conversation belongs to the organization.
- Matrix and other open protocols: They allow for their own server and end-to-end encryption. They require more technical expertise and are the option for those who don't want to depend on any company.
- SMS and RCS: The RCS standard brought modern features to the mobile phone's own messaging application, with end-to-end encryption in some cases, depending on the applications at both ends.
The conversation security code: what is that warning for?
Every messenger with end-to-end encryption has, hidden within the conversation, a security code — a sequence of numbers, almost always accompanied by a QR code. It appears when you tap on the contact's name and enter "encryption," "security number," or a similar name. Almost no one opens this screen, and it answers an important question: how do you know you're talking to the right person, and not someone in between?
The process is simple. This code is derived from the keys of both devices. If your code and your contact's code are the same—and the practical way to check is to scan their QR code when you're together—the conversation is between the two of you and no one else. It's the step that transforms "I trust the app is doing it right" into "I checked.".
More important than the conference call is the automatic notification: when a contact's security code changes, the app displays a message in the middle of the conversation. This happens for trivial reasons—the person changed phones, reinstalled the app, or changed their number. And it also happens in the worst-case scenario, when someone took over their account. The practical rule is the same in both cases: If the code changed and then you received a request for money, a Pix payment, or a six-digit code, confirm by phone before doing anything else.. Not by text message: by phone call, with the person's voice.
It's also worth enabling the code change notification in the app's security settings, if it's not enabled by default. It's a warning that costs nothing and is exactly what separates those who fall for the scam from their relatives who don't.
Switching phones or phone numbers without losing—or leaking—your history.
Migration is the time when people lose the most conversation and leave the most doors open. A script that works for any messenger:
- First of all, confirm where your backup is located. And what if it's encrypted? Migrating without resolving this is a classic way to lose years of conversation.
- Write down the password for two-step verification. It will be requested during activation on the new device, and there is no way to retrieve it if you don't have it.
- Prefer direct transfer between devices. When the application offers it. It's faster and doesn't depend on the cloud. Migration between different systems is usually the most laborious case and has its own tool — it's worth looking for the application's official instructions beforehand, not after.
- On the old device, disconnect the account. And only then restore the factory settings. Selling or giving away a phone with an active session is like giving away a conversation along with it.
- Review the list of connected devices. The next day. That's where any leftover sessions appear.
Changing your number requires extra care that almost no one takes: use the function of Change your number within the app., Instead of simply creating a new account, it migrates groups and notifies contacts. And understand what happens to the old line: the deactivated number returns to the operator and can be given to another person after a while. If your messaging account is still linked to it, whoever receives the line also receives the activation code. That's why two-step verification ceases to be optional at this point.
Groups: who sees what and what they do - invite link
Groups are places where messenger privacy often leaks without any technical flaws involved. Three practical facts that change the behavior of those who know them:
- In multiple messaging apps, every participant can see the phone numbers of the others. Joining a group of a thousand people is like handing your phone number to a thousand strangers — and that's how many people end up being scammed soon after joining any list.
- Invitation links are public by nature. Anyone with the address can enter without approval. A link pasted on an open page, on social media, or in another group can be found by anyone, including through search engines. If the group matters, use participant approval by the administrator and renew the link when an unwanted person appears.
- Leaving a group isn't as discreet as it seems. Some apps now only notify administrators when someone leaves, but this varies from service to service and changes with versions. If discretion is important, mute the group and archive it instead of leaving.
For large groups—condominium, school, work, community—it's best to treat each message as if it were spoken aloud in a room with strangers. Because that's exactly what it should be. Children's photos, addresses, routines, planned trips, and payment receipts shouldn't circulate there, and screenshots of a group are the material that travels most often outside of it.
Other questions about messengers
How do I know if I'm talking to the right person?
Compare the security code in the conversation, preferably by scanning the QR code when you're together. And always be suspicious if the code change notification is followed by a request for money: in that case, call the person before responding to anything.
I lost my cell phone. What do I do first?
Ask your carrier to block your SIM card, which prevents you from receiving the activation code; then, log out of your messaging sessions via the web or another device and change the password for the cloud account that stores your backup. After that, let your contacts know that they may receive requests for money in your name.
Do I need the same app on all devices?
No, but each connected device is another place where your conversations are readable. Keep only the ones you actually use and remove the rest from the list of connected devices—work computers and borrowed tablets often get forgotten there.
Is it okay to use more than one messaging app?
That's fine, and it's the normal scenario: one service for the entire network, another for sensitive topics, and another for the community. The mistake is the opposite—trying to bring everything together in a single service and ending up dealing with sensitive issues in the application where the history is stored on the server.
If a deleted message disappears from the other person's device?
Some of the visible conversation is saved within the timeframe allowed by the app, and nothing beyond that. It does not prevent screenshots, does not prevent photos of the screen from being taken by another device, and does not alter what has already been forwarded to third parties.
Read also
- Online Chat: Meet People and Make Real Friends
- Free Dating Apps: 10 Options and Who They're For
- Chatting with Strangers: How to Talk Without Giving Away Your Data
- Camera Chat: Apps for Friendships and New Encounters
- Dating After Divorce: Profile, Safety, and What to Expect
Frequently Asked Questions (FAQ)
Based on the verifiable set of criteria—end-to-end encryption enabled by default on everything, open protocol, absence of readable cloud backups, and minimal metadata collection—Signal is the most conservative. The obstacle is social: it only works if the other person also uses it.
Only secret conversations, which are individual and confined to a device, are encrypted. Regular conversations are encrypted between you and the server and stored there—this is what allows you to open them on multiple devices. Groups and channels are never end-to-end encrypted.
Only if you have enabled encrypted backup in the app settings. Without it, the copy goes to the phone's cloud and depends solely on the security of that account. It's the most common security flaw of all.
No. All the messaging apps on this list are for communicating with people you already know or with communities you're already part of. Apps designed for meeting new people are a different category, with a different logic and different security precautions.
Yes, practically everyone accepts it. Periodically review the list of connected devices within the app and end sessions you don't recognize — it's one of the most useful and least used security adjustments.
Enable two-step verification, never share the six-digit code that arrives via SMS, use a strong and unique password for the cloud account that stores your backup, and check the list of connected devices from time to time.
No. They require installation outside of the official store, don't undergo security review, have access to all your conversations, and can result in your account being banned. It's high risk for little convenience.
Conclusion
Choosing a messaging app is a trade-off. WhatsApp offers encryption by default and, most importantly, provides the network—everyone's already there. Telegram offers scalability and cross-platform convenience, at the cost of storing your history on its server. Signal offers the highest privacy standard and charges for convenience. Discord offers community and voice, but lacks content privacy. WeChat offers access to China, and that's it.
If you can only do two things after reading this, let them be these: enable two-step verification in the app you use most and Check if your backup is encrypted.. Together, they solve the two most common problems — account theft and exposed history in the cloud — in less than five minutes.
Save this article for future reference when setting up a new device, and share it with anyone who still thinks that all app conversations are private by nature.
