Best Slack Alternatives in 2025
Looking for alternatives to Slack? In this comparison, we take a closer look at Slack alongside similar software solutions including Slack, Signal, Avanquest message, Zalo, MyPhoneExplorer, Ashampoo Connect, Telegram Desktop, Discord, Line for Windows, UltraViewer and AnyViewer.
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 Slack, Signal, Avanquest message, Zalo, MyPhoneExplorer, Ashampoo Connect, Telegram Desktop, Discord, Line for Windows, UltraViewer and AnyViewer stack up to find the perfect software for your goals.
Platform Compatibility
 Slack
|
Available on both iOS and Android devices, supports mobile apps |
 Signal
|
Cross-platform support including Android, iOS, desktop, Debian-based Linux, Mac, Windows |
 Avanquest message
|
Works on all mobile devices, supports both slow and fast internet connections |
 Zalo
|
Available on iOS, Android, desktop and web versions |
 MyPhoneExplorer
|
Compatible with Windows PC and virtually every Android device |
 Ashampoo Connect
|
Web-based application accessible from any web browser and Android/iOS devices |
 Telegram Desktop
|
Supports Windows, macOS, Linux, mobile versions for Android and iOS |
 Discord
|
Available on Android, various platforms including desktop and mobile apps |
 Line for Windows
|
Supports Android, Windows, Mac and multiple devices |
 UltraViewer
|
Supports Windows only; no mobile app support |
 AnyViewer
|
Supports Android, iOS, Windows, Linux, macOS |
Messaging and Communication Features
|
Slack
|
Messaging platform with channels, direct messages, audio files, apps integrations |
|
Signal
|
Secure messaging with end-to-end encryption, group chats up to 150 participants, voice and video calls |
|
Avanquest message
|
Powerful messaging tool for complex message campaigns with no limit on the number of messages |
|
Zalo
|
Free messaging app with text messages, group voice and video calls up to 8 people |
|
MyPhoneExplorer
|
SMS management and syncs contacts, calendar events between PC and Android device |
|
Ashampoo Connect
|
Cloud-based file sharing and collaboration with real-time file editing and secure link sharing |
|
Telegram Desktop
|
Instant messaging with multiple accounts support, group voice chats but no video calls on desktop |
|
Discord
|
Voice, video and text communication platform with dedicated servers and chat channels |
|
Line for Windows
|
Instant messaging with voice and video calls supporting up to 500 users in group chat |
|
UltraViewer
|
Remote computer control software with file transfer and text chat capabilities |
|
AnyViewer
|
Remote desktop software with file sharing, remote printing, remote task manager |
Security Features
|
Slack
|
Enterprise-grade security controls including data encryption and two-factor authentication |
|
Signal
|
Open-source software offering end-to-end encryption; minimal user data stored; no message metadata retention |
|
Avanquest message
|
Uses latest encryption technology to protect sensitive data during messaging campaigns |
|
Zalo
|
Includes various security features such as passcode lock and two-step verification to prevent unauthorized access |
|
MyPhoneExplorer
|
Limited customization options regarding security; occasional bugs noted |
|
Ashampoo Connect
|
Provides SSL encryption with added security measures and password protection for shared links |
|
Telegram Desktop
|
Offers secure communication but some limitations in desktop version features; supports multiple languages |
|
Discord
|
Includes robust moderation tools and optional premium features for enhanced security; user authentication needed |
|
Line for Windows
|
Contains security measures including passcode protection but some privacy concerns noted |
|
UltraViewer
|
Basic security features; lacks unattended access; caution advised due to poor customer support |
|
AnyViewer
|
Uses industry-standard AES-256 bit encryption with enhanced security features including two-factor authentication |
Choosing the right software isn’t just about features. Size, license type, user ratings, and popularity also matter.
This quick comparison shows how Slack stacks up against Slack, Signal, Avanquest message, Zalo, MyPhoneExplorer, Ashampoo Connect, Telegram Desktop, Discord, Line for Windows, UltraViewer and AnyViewer in these key areas—helping you find the best alternative for your needs.
Size
|
Slack
|
64MB |
|
Signal
|
261.9MB |
|
Avanquest message
|
|
|
Zalo
|
131.5MB |
|
MyPhoneExplorer
|
|
|
Ashampoo Connect
|
199.7MB |
|
Telegram Desktop
|
|
|
Discord
|
48.5MB |
|
Line for Windows
|
33.4MB |
|
UltraViewer
|
3.5MB |
|
AnyViewer
|
40.2MB |
License
|
Slack
|
Commercial |
|
Signal
|
Open Source |
|
Avanquest message
|
Commercial |
|
Zalo
|
Commercial |
|
MyPhoneExplorer
|
Freeware |
|
Ashampoo Connect
|
Freeware |
|
Telegram Desktop
|
Freeware |
|
Discord
|
Freeware |
|
Line for Windows
|
Commercial |
|
UltraViewer
|
Freeware |
|
AnyViewer
|
Freeware |