Delta Chat vs Tox
When comparing Delta Chat vs Tox, 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 Tox is ranked 7th.
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Pros
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
Pro Privacy focused
Tox uses military grade encryption and works completely peer-to-peer.
Pro Free and open source
The code is licensed under GPL (may change in the future) and is available on GitHub.
Pro Multiple front-ends for multiple platforms available
At the moment there is no official Tox client, but a selection of 32 and 64 clients for Windows, OS X, Linux and Android is available.
Cons
Con Email providers "recipents" per day limitation
Unless you control or run your own email server.
Con Early stages of development
Since Tox is relatively new, it has important features missing (like group video) and requires a proper code review before it can be deemed reliable and ready for everyday use.