Best Signal Alternatives in 2025

Looking for alternatives to Signal? In this comparison, we take a closer look at Signal alongside similar software solutions including Signal, Slack, Line for Windows, Imo Messenger, Telegram Desktop and Viber.

Our detailed comparison table highlights key features, pricing, and performance of these leading solutions, empowering you to make an informed decision. Whether you're seeking robust functionality, user-friendly design, or cost-effective alternatives, explore how Signal, Slack, Line for Windows, Imo Messenger, Telegram Desktop and Viber stack up to find the perfect software for your goals.

	Platform Support	Security and Privacy	Communication Features
Signal	Available on Android, iOS, desktop platforms including Windows, Mac, Debian-based Linux.	Added privacy with minimal user data collection, secure communication with encryption; known for strong security measures and privacy concerns are minimal.	Supports all message types including text, voice, video calls, group chats up to 150 participants, self-destructing messages.
Slack	Available on Android, iOS, desktop platforms with apps and web access.	Enterprise-grade security controls with data encryption and two-factor authentication.	Supports real-time messaging, channels for specific topics, file sharing across many types; advanced project management capabilities with workflows and alerts.
Line for Windows	Available on Android, Windows, Mac, and supports multiple devices and platforms.	Added security features but some privacy concerns exist; occasional glitches noted.	Supports instant messaging, voice and video calls, group chats up to 500 users, stickers, file sharing in various formats.
Imo Messenger	Available on Android and iOS platforms; supports web browsers.	Increased privacy and encryption mentioned but some bugs and occasional glitches reported.	Supports instant messaging, voice and video calls, group chats up to 30 members, multimedia file sharing in various languages with stickers.
Telegram Desktop	Cross-platform functionality including Linux, macOS, Windows, mobile versions.	Secure communication with end-to-end encryption for secret chats; no video call feature on desktop.	Supports instant messaging, group voice chats, file sharing, multiple accounts; lacks video call feature on desktop; seamless sync between devices.
Viber	Available on multiple devices and platforms including desktop and smartphones.	Secure messaging with automatic backups; some privacy concerns noted; uses data encryption.	Supports free voice and video calls internationally, group chats up to 200 users, fun stickers; low-cost international calling rates.

Platform Support

Signal	Available on Android, iOS, desktop platforms including Windows, Mac, Debian-based Linux.
Slack	Available on Android, iOS, desktop platforms with apps and web access.
Line for Windows	Available on Android, Windows, Mac, and supports multiple devices and platforms.
Imo Messenger	Available on Android and iOS platforms; supports web browsers.
Telegram Desktop	Cross-platform functionality including Linux, macOS, Windows, mobile versions.
Viber	Available on multiple devices and platforms including desktop and smartphones.

Security and Privacy

Signal	Added privacy with minimal user data collection, secure communication with encryption; known for strong security measures and privacy concerns are minimal.
Slack	Enterprise-grade security controls with data encryption and two-factor authentication.
Line for Windows	Added security features but some privacy concerns exist; occasional glitches noted.
Imo Messenger	Increased privacy and encryption mentioned but some bugs and occasional glitches reported.
Telegram Desktop	Secure communication with end-to-end encryption for secret chats; no video call feature on desktop.
Viber	Secure messaging with automatic backups; some privacy concerns noted; uses data encryption.

Communication Features

Signal	Supports all message types including text, voice, video calls, group chats up to 150 participants, self-destructing messages.
Slack	Supports real-time messaging, channels for specific topics, file sharing across many types; advanced project management capabilities with workflows and alerts.
Line for Windows	Supports instant messaging, voice and video calls, group chats up to 500 users, stickers, file sharing in various formats.
Imo Messenger	Supports instant messaging, voice and video calls, group chats up to 30 members, multimedia file sharing in various languages with stickers.
Telegram Desktop	Supports instant messaging, group voice chats, file sharing, multiple accounts; lacks video call feature on desktop; seamless sync between devices.
Viber	Supports free voice and video calls internationally, group chats up to 200 users, fun stickers; low-cost international calling rates.

Choosing the right software isn’t just about features. Size, license type, user ratings, and popularity also matter.

This quick comparison shows how Signal stacks up against Signal, Slack, Line for Windows, Imo Messenger, Telegram Desktop and Viber in these key areas—helping you find the best alternative for your needs.

	Size	License	Popularity
Signal	261.9MB	Open Source	13%
Slack	64MB	Commercial	0%
Line for Windows	33.4MB	Commercial	12%
Imo Messenger	46.3MB	Commercial	0%
Telegram Desktop		Freeware	100%
Viber	1.3MB	Freeware	16%

Size

Signal	261.9MB
Slack	64MB
Line for Windows	33.4MB
Imo Messenger	46.3MB
Telegram Desktop
Viber	1.3MB

License

Signal	Open Source
Slack	Commercial
Line for Windows	Commercial
Imo Messenger	Commercial
Telegram Desktop	Freeware
Viber	Freeware

Rating

Signal
Slack
Line for Windows
Imo Messenger
Telegram Desktop
Viber

Popularity

Signal	13%
Slack	0%
Line for Windows	12%
Imo Messenger	0%
Telegram Desktop	100%
Viber	16%