Specification of app features for comparison with other security focused messengers

[ghost]

Here is the full list of questions used in this comparison, which currently does not include RetroShare. I was able to fill out some of them already. It would be great to hear from you guys and receive some answers.

About the app
Price: free
Repository: GitHub
Software license: Multiple
Availability: Github, F-Droid
Client is available since: 2006
Comes without proprietary libraries:

Platforms
Available on Android: Yes
Available on iOS: No
Available on Windows: Yes
Available on macOS: Yes
Available on Linux: Yes
Available via web client: No

Privacy / Security / Anonymity
Encryption protocol / library: PGP
Cryptographic primitives:
End-to-end encryption:
End-to-end encrypted 2-user chat:
End-to-end encrypted group chat:
E2EE is turned on by default:
Local message encryption:
Perfect forward secrecy is enforced: Yes
Certificate pinning is used:
Directory service can be modified to enable a MITM attack:
Contact verification possible: Yes
Contact can be added without needing to trust a directory server:
Notification if contact's fingerprint changes:
Contact's fingerprints can be verified manually: Yes
Avoids / Protects metadata during use:
Native Tor support: Yes
Last security audit:
Tracker integration (Exodus):
Use without phone number possible: Yes
Use without Google Play Services possible: Yes
Reasonably useful without sharing the contact list: Yes

Ecosystem and developers
Centralized / Federated / Decentralized: decentralized Peer-to-peer
Infrastructure hosting: (no servers)
Open Source server: (no servers)
Transparency report:
Legal jurisdiction:
Jurisdiction of the devs/company:
Funding:

Functionality
Visible if contacts are online: Yes
Audio-/Video-chats: Yes (experimental)
Group chats: Yes
Voice messages: No
File exchange: Yes
Read receipts: No
Editing sent messages: No
Self-destructing messages: No
Deleting sent messages locally: Yes
Deleting sent messages for both (2 user chat): No
Synchronization between multiple devices:

Backup
Storage location:
Automated:
Encrypted:

[csoler]

Thx for your interest in the software. Here's a list of elements (only the ones that need fixing):

About the app
Comes without proprietary libraries: yes
Available via web client: No (Partially. The web app is not complete yet).

Privacy / Security / Anonymity
Encryption protocol / library: TLS 1.3 (OpenSSL)
Cryptographic primitives: TLS_AES_256_GCM_SHA384, Chacha20+poly1305
End-to-end encryption: yes
End-to-end encrypted 2-user chat: yes
End-to-end encrypted group chat: no
E2EE is turned on by default: yes
Local message encryption: yes
Perfect forward secrecy is enforced: Yes
Certificate pinning is used: no
Directory service can be modified to enable a MITM attack: no
Contact verification possible: Yes
Contact can be added without needing to trust a directory server: ?
Notification if contact's fingerprint changes: yes (stops connecting to those friends)
Contact's fingerprints can be verified manually: Yes
Avoids / Protects metadata during use: yes
Native Tor support: Yes
Last security audit: 2017? (by Elttam)
Tracker integration (Exodus):
Use without phone number possible: Yes
Use without Google Play Services possible: Yes
Reasonably useful without sharing the contact list: Yes

Ecosystem and developers
Centralized / Federated / Decentralized: decentralized Peer-to-peer
Infrastructure hosting: (no servers)
Open Source server: (no servers)
Transparency report: blog, open source code, external (incomplete) doc, research report.
Legal jurisdiction: none
Jurisdiction of the devs/company: none
Funding: Mostly none, except Google summer of code

Functionality

Read receipts: Yes
Deleting sent messages locally: Yes
Synchronization between multiple devices: No

Backup
Storage location: local (encrypted) old versions of config and data files.
Automated: yes
Encrypted: yes

[ghost]

Thank you very much for your fast response and the time you took. I appreciate it!