When comparing Threema vs Slingshot, the Slant community recommends Threema for most people. In the question“What are the best messaging apps for Android?” Threema is ranked 6th while Slingshot is ranked 43rd. The most important reason people chose Threema is:
Registration is handled by random generated IDs. No phone number needed.
Specs
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Pros
Pro Registration without phone number
Registration is handled by random generated IDs. No phone number needed.
Pro Encrypted communication
Provides complete end-to-end encryption.
Pro Company behind Threema is based in Switzerland
Pro Servers in Switzerland
Privacy laws protect the data Threema has.
Pro Supports encrypted group chats
Pro Provides a web client
You can control and message with friends via Threema Web, the official web client for Threema.
Pro Ability to send pics and videos
Threema supports sending media messages such as video, pics and even voice messages.
Pro Group chat polls
Pro Allows verification of contacts identity via QR Code
Pro Send to receive nudges users to interact
Requiring users to first share a photo or video before they can view photos and videos from others makes it more likely that the other person will respond.
Pro One tap photo and video sharing
The first thing that the app presents the user with is the camera enabled and ready to take photos and videos. Photos and videos can have text written on them in white letters or drawn on with various colors and brush sizes.
Cons
Con Not free
Unlike many other options Threema is not free as it costs $1.99 for the app.
Con Single device only
You cannot use multiple devices to send messages. However, it does have message mirroring on a web client.
Con No cloud sync
E2E encryption means no cloud syncing of messages.
Con Send to receive is unintuitive
Requiring users to first share a photo or video before they can view photos and videos from others can often feel frustrating.