When comparing Threema vs Jami (formerly GNU Ring, SFLphone), the Slant community recommends Jami (formerly GNU Ring, SFLphone) for most people. In the question“What are the best Skype alternatives?” Jami (formerly GNU Ring, SFLphone) is ranked 7th while Threema is ranked 21st. The most important reason people chose Jami (formerly GNU Ring, SFLphone) is:
Contribute to and/or audit the source code [here](https://git.jami.net/).
Ranked in these QuestionsQuestion Ranking
Pro Encrypted communication
Provides complete end-to-end encryption.
Pro Registration without phone number
Registration is handled by random generated IDs. No phone number needed.
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 Group chat polls
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 Free and open-source code
Contribute to and/or audit the source code here.
Pro Video conferences
Make audio and video calls with multiple people on Jami. Easily add new participants. Because Jami does not rely on servers, the conference is hosted by the device of the person who initiates it. It mixes the audio and video feeds from all the participants and sends it back to them so everyone can see and hear each other. For this reason, the maximum number of participants depends on the hosting device's computing power and available bandwidth. The developers have tested video conferencing with up to sixteen members; however, it could potentially go higher.
Pro Screen sharing and media streaming
You can change the source of the video feed you send your friends during a call, allowing you to share either your entire screen or only sections. You can also stream any audio and video media files, allowing your friends to see or hear them without having to transfer them first. This is accessed by right-clicking on the screen during a call.
Pro 4K/UHD video calling
If your device has a 4K camera, you can use it to its full potential with Jami thanks to the support for Ultra HD resolution. It is only really useful if the other person has a 4K screen, but if it's the case, they will see you as clearly as if you were there.
Pro Audio and video messages
Record and send audio and video messages. This is convenient for when you want to send a quick message without typing.
Pro Active project
Active community with frequent articles posted on their blog.
Pro Crystal clear audio
Calls have crystal clear audio.
Pro Works without Internet access
If required, works within a Local Area Network (LAN) without the need for an Internet connection.
Pro Open development
The Jami software has many features and is stable; yet, the rate of development is increasing as more developers are contributing to provide even more features while keeping the software stable.
Pro No central server required
If there is a wired and/or wireless connection between the caller and receiver, you can make a call.
Pro Language support
Translated into many languages and open for more translations.
Pro SIP support
Answer and make VoIP telephone calls from anywhere in the world where you are connected to the internet.
Pro Intercom calls and file transfers between devices
The same account can be setup on multiple devices. You can then make calls between the same account on different devices. You can also transfer files between devices without using third-party services (like email accounts).
Pro File sharing
Send files of all sizes between Jami users. FLAC, GIF, JPEG, JPG, MKV, MP3, MP4, OGG, PNG, WAV, WEBM and WEBP file extensions are automatically downloaded.
Pro Cross platform support (computers, smartphones and televisions)
Works with devices running Android, Android TV, GNU/Linux, iOS, macOS and Windows operating systems.
Pro Supports multiple accounts
You can have multiple Jami and SIP accounts active concurrently.
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 Rename contact/conversation
Unable to rename a contact/conversation in the list.
Con Chat history shared across devices
Con Group text chat
Not yet supported; however, group video conferences are supported.