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Telegram is a messaging app with a focus on speed and security. Telegram's client-side code is open-source, the server-side code is proprietary.
SpecsUpdate
PlatformsWeb, Android, iOS, Windows, Linux, macOS, BSD, Windows phone, UWP
Audio recordingYes
PublisherVarious companies affiliated with Telegram
End-to-end encryptionSecret chats
VideoconferencingYes
Mediaimages / video / audio / GIFs / stickers / PiP Video / Videomessages
VoIPYes
Groups≤ 100,000
Video recordingYes
DIY integrationsYes
File Size2048 MB
Service integrationsThrough bots
LocationsharingLive
Message historyYes
Unit TestingYes
MultideviceCloud
Open sourceMost clients
In-app purchasesTo pay 3rd parties
Usernamesyes
Message deletionMutual/timed
Open source backendno
Audio/video streamingOnly from some clients
Cloud syncYes
Open clients APIyes
MultiplatformYes
Proxy supportyes
Pros
Pro Secure
Know any positive aspects of this option?
Cons
Con Only "Secret Chat" messages are encrypted end to end
The only way to get end-to-end encryption (client-client) using Telegram is to use the Secret Chat function, anything through the service is server-client encrypted. Also secret chat is only implemented in the mobile apps, meaning there is no way to encrypt messages end-to-end when using the desktop client or the web browser client.
Know any negative aspects of this option?
Recommendations
Telegram
Recommended 10 months ago
Pro
Free and convenient large file sharingPro
Free of costPro
Privacy focusedPro
Media messagingPro
Beautiful UIPro
Possible to send photos and videos without compressionPro
Cross-platformPro
SecurePro
Saved messagesPro
Multiplatform native client appsPro
Unlimited storagePro
Pinned MessagesPro
Edit or delete messages after sending themPro
@mentionsCon
Can only be used with a phone numberCon
Only "Secret Chat" messages are encrypted end to end