Threema vs Slack : Which is Better?

Threema

Threema is an encrypted instant messaging application for iOS, Android and Windows Phone. Developed by Threema GmbH

License: Commercial

Apps available for Android iPhone Android Tablet Windows Phone iPad

Slack is a cloud-based team collaboration tool. Developed by Slack Technologies, Inc.

License: Freemium

Apps available for Mac OS X Windows Linux Online Android

Feature	Threema	Slack
Encrypted chat
Encrypted email
Chat
Confirm messages
Sync Contacts
Encrypted Email
Encrypted backups
Encrypted calls
End-to-End Encryption
Group chat
Integrated App lock
Integrated File Sharing
Multiple languages
Picture sharing
Polling
Privacy focused
Secure Chat
Security focused
Social network
Stickers
Chat Bot
Lightweight
Cloud sync
Privacy-friendly
Group collaboration
Multi Channel
Team Collaboration
Decentralized
Security & Privacy
Peer-To-Peer
Custom Backgrounds
Forums
Video calling
Threaded Conversations
Chat organizer
Bluetooth Support
Decentralisation
Non-cloud solution
Collaborative
Extensible by Plugins/Extensions
IFTTT integration
Onboarding
Out Of The Box
Reactions
App integration
Channel manager
Channels
Direct file uploading
Electron based
HIPAA compliant
Live Push Notifications
Support for @mentions
Multiple channels
Multiple teams
Real time collaboration
Team work
Video chat
Voice Call
Ad-free
On-premises software
Self-hosted in intranet or private cloud
Live Chat
Federation
Share your screen
Gmail integration
Video Conferencing
Content Templates
File sharing
Gantt-charts
Apps that Sync with Google Calendar