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Signal Open Source Messenger

Signal Open Source Messenger


What is Signal Open Source Messenger?

Signal is an open source cross-platform messaging app featuring end-to-end encryption to keep conversations private and secure, boasting no ads, no affiliate marketers, and no creepy tracking in Signal. Users can focus on sharing the moments that matter.

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What is Signal Open Source Messenger?

Signal is an open source cross-platform messaging app featuring end-to-end encryption to keep conversations private and secure, boasting no ads, no affiliate marketers, and no creepy tracking in Signal. Users can focus on sharing the moments that matter.

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Product Details

What is Signal Open Source Messenger?

Signal Open Source Messenger Technical Details

Deployment TypesOn-premise
Operating SystemsWindows, Linux, Mac
Mobile ApplicationApple iOS, Android
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Reviews and Ratings


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(1-3 of 3)
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Score 9 out of 10
Vetted Review
Verified User
Signal Open Source Messenger is a great solution for end-to-end encrypted messaging across our organization. We use it for working groups, and invite new partners into dedicated groups that allow us to securely communicate across a variety of regions. It also allows a decent transfer of photos and video files, password updates, etc. in a secure context.
  • Offers end-to-end encryption
  • Provides secure calling solution
  • Transfer of secure data
  • Media sharing
  • Backup functionality on iOS devices
  • Sometimes messages can be delayed
I recommend all my colleagues use Signal Open Source Messenger, and I have referred many partners to use it as well. It is helpful to know that from device to device, our communication will not be easily intercepted. I also use it to securely transfer information between my devices, such as a new password.
  • Communication is crucial to accomplishing our mission
  • Cost of similar commercial apps could be very prohibitive
Signal Open Source Messenger was clearly a more secure and audited solution. We appreciated the open-source nature of the Signal origins.
Andy Abramson | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
More and more we need reliable and secure communication tools as corporate espionage is on the rise. Conversations with clients and staff need to be kept confidential. Signal offers one of the highest levels of encryption end to end, and because it's not using the Public Switched Telephone Network (PSTN) the call is not able to be intercepted, and with encryption, not able to be heard by prying ears or messages seen by prying eyes.
  • Encryption end to end
  • Audio quality
  • Ability to permanently delete messages and history
  • Needs to add video
  • Add time zone information so you don't call at the wrong time
  • Improve the interface, as it's too bland
Signal is best when you want to keep a conversation confidential. The whole premise of Signal is privacy, based on keeping location, contents, and what's in the content private. By having the delete function and the time limit on messages, as well as auto-delete, messages that are seen are not left on the device longer than they need to be. It's not appropriate for simple regular chatting or sending files that need to be shared. That's not its strong suit. What is its strong suit is the peace of mind that your confidential conversations are meant to be kept that way.
  • I reach people who I need to more quickly.
  • It is a free service.
  • It provides my clients confidence in keeping things confidential that need to be.
Signal is far and away better and more feature-rich. Skype is no longer the app it used to be before Microsoft acquired it, and WhatsApp, while trying to be much like Signal with claims, has too many features that lead to a sense of insecurity as it's too widely used and used for too many things.
You don't really need support as the app just works. In the two plus years I've been using Signal, I've never needed to even look at support documentation to learn how to do something or have the app work. It just does. The best support is not needing to use it, and Signal meets that standard.
Jonah Dempcy | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
I use Signal as instant messenger of choice for talking to a number of my friends who only use it, mainly for privacy reasons. Signal is a highly secure messaging system that makes it very difficult for outside sources to intercept messages between two people. I have a number of friends and colleagues who are highly concerned about privacy and refuse to use any other instant messaging system. While I use a number of instant messengers, I respect this decision, and thus I use Signal to engage with them. I also prefer to use Signal when discussing highly sensitive matters that I wouldn't want potentially entering the public record.
  • Security - This is the main feature Signal is known for, and it's no joke. Signal's encrypted messaging is best in class and you can rest assured that it would be very difficult for a third party to intercept your messages.
  • Filesharing - You can share all manner of files and audiovisual content through Signal in a secure way.
  • Desktop/Mobile Sync - In order to sync your mobile installation of Signal to the desktop version, you have to use a QR Code, and do it every time you update. Old versions of Signal are no longer able to send or receive messages. This is a good and bad thing as it is a bit of a hassle, but it helps to add extra layers of security.
  • Message Drafts - A nice feature where you don't lose messages you are in the middle of writing.
  • Named Conversations - It's nice to be able to organize conversations
  • Temporary Messages - You can send messages that will be deleted after a certain time, or when read.
  • Video and Voice Chat - In addition to texting, Signal lets you make video and voice calls.
  • Update Hassle - While this is also a positive in added security, every time they release an update to the app, you have to update. Since I only use the app occasionally, I have to update probably 1-in-4 times I open the app. It feels laborious as I will sometimes want to send a friend or colleague a message, who only uses Signal, and I open the app to message them and suddenly have to wait 2-4 minutes to update and install the new version.
  • Not Getting Messages - You also no longer send and receive messages until you update. So if you have an outdated version of the app, nobody can get ahold of you and they might not know why you aren't responding.
  • Re-Sync Via QR Code After Update - Every time I update, I have to re-sync my mobile app to the desktop. So it adds another added step. The forced updates and forced resync steps are quite laborious.
Signal is great for high-security applications where privacy is a concern, perhaps because of the sensitive nature of the materials being communicated. For instance, if you are sending sensitive information about a film that hasn't been released yet, and you want to make sure that paparazzi and fans don't get access to spoiler information, Signal is a great way to communicate.
  • Positive - Signal allows us to communicate with colleagues and clients that prefer to use it.
  • Positive - Increased security gives increased peace of mind in discussing sensitive matters or sharing sensitive materials.
  • Negative - Hassle updating the app regularly.
The closest competitor we've found for Signal is Telegram. We do use Telegram with some clients and individuals who prefer it. Unfortunately, in this climate where there is no clear winner and a lot of diversity in applications, if you work with a lot of clients you're going to have to install a whole suite of instant messaging apps. Still, given the choice, we prefer Signal over its competitors, specifically for applications where high security is a concern.
I've never contacted support but I see that they are on the ball for bug fixes, highly communicative in release notes, and continually releasing updates to Signal that address common user complaints. Given how responsive the development team is, and how they are continually improving Signal, I think their support is top notch.
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