When comparing Delta Chat vs StealthChat, 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 StealthChat is ranked 11th.
Specs
Ranked in these QuestionsQuestion Ranking
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 Can send self-destructing messages
Messages can be set to self-destruct after a set time.
Pro Offers 3 types of encryption
The app claims to be the only communication app that encrypts data in transit, on disk and on screen. Encryption in transit is used to make sure no-one can listen in on your conversations even if the traffic is going through their servers, encryption on disk is used to make sure that even if someone gets ahold of your phone and is capable of extracting your messages from it they won't be able to read them and screen encryption is essentially a lock screen that sets in after a set amount of time used to make prevent "shoulder surfing".
Cons
Con Email providers "recipents" per day limitation
Unless you control or run your own email server.
Con Many people have difficulty registering the app
Multiple people have reported not being able to receive the activation code required to register the app.
Con Code is not verified
Con Poor support
Con Lacks group chat
Con Closed source
No way to verify security practices.