When comparing Threema vs Delta Chat, the Slant community recommends Delta Chat for most people. In the question“What are the best cross-platform encrypted messaging apps?” Delta Chat is ranked 5th while Threema is ranked 9th.
Specs
Ranked in these QuestionsQuestion Ranking
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 No phone number required
Pro Open Source
Pro No registration required
Pro PGP-encrypted via Autocrypt Guideline
Pro Uses well-established protocols
Everyone knows/uses Email.
Pro Distributed architecture
There is no central Delta Chat server.
Pro You can forward a message from one chat to another
Pro You can share a document, a file, an image, an audio even with applications outside Delta Chat
Pro Multi account
Pro Disappearing messages
It has messages that disappear automatically.
Pro Independent video chat
You can use Jitsi Meet or other providers.
Pro You can reply privately
When you are in a group and want to comment privately on a person's sentence, press and hold on the sentence and click on reply privately. The user will be notified with the quoted and commented sentence. If he clicks on the quoted sentence it will take him to the group and to the position where he wrote this sentence.
Pro You can create broadcast lists
It will be present in the next version.
Pro Bots can be created
Without needing to have a space on a server, just a simple PC and an email for the bot.
Pro You can send stickers and animated stickers
Pro You can decide to set a limit for the size of messages that will be downloaded automatically
Pro You can set a ringtone for each chat
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 Email providers "recipents" per day limitation
Unless you control or run your own email server.
