Telegram is a messaging app created by former https://alternativeto.net/software/vkontakte/ creators with a focus on speed and security. It’s superfast, simple and free. It is like SMS, but more powerful.

You can send messages, photos and videos to people who are in your phone contacts (and have Telegram). You can also create groups for up to 20000 people or channels for unlimited subscribers. 

Your chats are not encrypted by default, which enables other people to see what you are writing. You can enable a &quot;Secret Chat&quot; to enable end-to-end encryption.

Telegram&#39;s security model has received notable criticism by cryptography experts. They criticized the general security model of permanently storing all contacts, messages and media together with their decryption keys on its servers by default and by not enabling end-to-end encryption for messages by default.

Telegram&#39;s client-side code is open-source software, whereas its server-side code is closed-source and proprietary. The service also provides public APIs with which developers can access the same functionality as Telegram&#39;s official apps to build their own messaging applications.

Telegram also provides a bot API for programmers to create different kinds of Telegram bots. Bots are simply Telegram accounts operated by software – not people – and they&#39;ll often have AI features. They can do anything – teach, play, search, broadcast, remind, connect, integrate with other services, or even pass commands to the Internet of Things.


Telegram

Windows

Linux

Online

Windows Mobile

Android

iPhone

Blackberry

Android Tablet

Windows Phone

iPad

Apple Watch

Android Wear

PortableApps.com

Haiku

FreeBSD

<p>Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free. It is like SMS, but more powerful.</p>

With Viber, everyone in the world can connect. Freely. More than 460 million Viber users text, make HD-quality phone and video calls, and send photo and video messages worldwide over WiFi or 3G - for free. Viber Out can be used to make calls to non-Viber landlines and mobile numbers at low rates. Viber is available for many smartphones and platforms.

On Viber, your phone number is your ID. The app syncs with your mobile contact list, automatically detecting which of your contacts have Viber.

• Text with your friends
• Make free phone and video calls with HD sound quality
• Share photos, videos, voice messages, locations, stickers and emoticons
• Create gGroups messages with up to 100 participants
• Follow Public Chats – get on the inside with your favourite celebs, brands and personalities; watch their conversations unfold in real-time, ‘like’ comments and share multi-media content
• Download stickers from the Sticker Market to make messaging fun!
• Push notifications guarantee that you never miss a call or message, even when Viber is off
• Support for the Viber Desktop application on Windows, Mac, Linux and Windows 10

Localized to: Arabic, Catalan, Chinese (SP), Chinese (TR), Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian, Polish, Portuguese (BR), Portuguese (PT), Romanian, Russian, Slovak, Spanish, Swedish, Thai, Turkish, Ukrainian and Vietnamese

Viber

Windows S

Blackberry 10

<p>Viber is a mobile application that lets you make free phone calls and send text messages to anyone who also has the application installed. .</p>

Apps with 'Animated stickers' feature

Telegram

Viber