SUM - Secure Ultimate Messenger Alternatives

SUM - Secure Ultimate Messenger is described as 'SUM is a simple secure desktop instant messenger for local networks. No server infrastructure is needed. All communication is encrypted and nothing saved on any server' and is an app. There are more than 10 alternatives to SUM - Secure Ultimate Messenger for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet apps. The best SUM - Secure Ultimate Messenger alternative is LAN Messenger, which is both free and Open Source. Other great apps like SUM - Secure Ultimate Messenger are Feem, Squiggle, Winpopup LAN Messenger and Output Messenger.

SUM - Secure Ultimate Messenger alternatives are mainly Instant Messengers but may also be Group Chat Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of SUM - Secure Ultimate Messenger.

SUM - Secure Ultimate Messenger

Free • Open Source

SUM is a simple secure desktop instant messenger for local networks. No server infrastructure is needed. All communication...

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LAN Messenger
Is this is a good alternative?
Yes
No
Free • Open Source
Instant Messenger
Mac
Windows
Linux
PortableApps.com
23 LAN Messenger alternatives
LAN Messenger is a p2p chat application for intranet communication and does not require a server. A variety of handy features are supported including notifications, personal and group messaging with encryption, file transfer and message logging.
- - LAN Messenger is the most popular Windows, Mac & Linux alternative to SUM - Secure Ultimate Messenger.
- - LAN Messenger is the most popular Open Source & free alternative to SUM - Secure Ultimate Messenger.
Suggest and vote on features
LAN Messenger Features
1. PortableLAN Messenger can be used from a USB stick or similar with no prior installation.
License plate detection
Integrated File Sharing
Team Messaging
Discontinued
Sadly, no more releases since Dec. 2018
Feem
Is this is a good alternative?
Yes
No
Freemium • Proprietary
Mac
Windows
Linux
Android
iPhone
Android Tablet
Windows Phone
iPad
139 Feem alternatives
Share files offline. No servers. No cloud. No limits.
- - Feem is the most popular Android, iPhone, iPad & Android Tablet alternative to SUM - Secure Ultimate Messenger.
Suggest and vote on features
Feem Features
Integrated Chat
Squiggle
Is this is a good alternative?
Yes
No
Free • Open Source
Windows
15 Squiggle alternatives
Squiggle is a free server-less peer to peer LAN messenger. Just download and run it and you're ready to talk to everyone on your LAN.
Suggest and vote on features
Squiggle Features
1. PortableSquiggle can be used from a USB stick or similar with no prior installation.
LAN
Winpopup LAN Messenger
Is this is a good alternative?
Yes
No
Free Personal • Proprietary
Instant Messenger
Windows
20 Winpopup LAN Messenger alternatives
Winpopup LAN Messenger is a cost-effective Office, Corporate, Enterprise Instant Messaging solution.
Suggest and vote on features
Winpopup LAN Messenger Features
LAN
Output Messenger
Is this is a good alternative?
Yes
No
Paid • Proprietary
Group Chat App
Instant Messenger
Mac
Windows
Linux
Android
iPhone
Self-Hosted
71 Output Messenger alternatives
Private and Secure Instant Messenger for Office designed specifically for keeping remote employees and multiple offices in sync.

"Give your team the freedom to chat, talk, share and interact together from anywhere, on any devices" by using it.
- - Output Messenger is the most popular Self-Hosted alternative to SUM - Secure Ultimate Messenger.
- - Output Messenger is the most popular commercial alternative to SUM - Secure Ultimate Messenger.
Suggest and vote on features
Output Messenger Features
1. Screen SharingYou can use Output Messenger to share your screen with your colleages or friends.
Voice Chat
Integrated File Sharing
Integrated Chat
Lan Messenger (outdated)
Is this is a good alternative?
Yes
No
Free • Open Source
Mac
Windows
Linux
15 Lan Messenger (outdated) alternatives
LAN Messenger is a decentralized UDP IM-style chat client which supports usernames, guaranteed-delivery IMs, broadcast chat, encryption, file transfer, simple UI, persistent settings, and IP blocking.
Lan Messenger (outdated) has no features, suggest some!
Discontinued
And almost as outdated as the original Lan Messenger. Last repo update from 2013.
BigAnt Office LAN Messenger
Is this is a good alternative?
Yes
No
Paid • Proprietary
Windows
23 BigAnt Office LAN Messenger alternatives
BigAnt Office LAN Messenger offers rich features for secure and stable business communication.
BigAnt Office LAN Messenger has no features, suggest some!
Softros LAN messenger
Is this is a good alternative?
Yes
No
Paid • Proprietary
Instant Messenger
Mac
Windows
Android
Android Tablet
22 Softros LAN messenger alternatives
Is your company starting to experience communication problems? Does it take too much time to call your co-workers to invite them to a group meeting? Hate walking all over the building to solve some trivial issue?
Suggest and vote on features
Softros LAN messenger Features
LAN
Remote Support
AChat
Is this is a good alternative?
Yes
No
Free • Proprietary
Windows
20 AChat alternatives
AChat enables you to chat on your local network (LAN). But you can also share entire directories or send specific files, show images to other users and send messages even to users who are currently offline. Everything with full Unicode support.
AChat has no features, suggest some!
Add a screenshot
RealPopup LAN chat
Is this is a good alternative?
Yes
No
Paid • Proprietary
Instant Messenger
Mac
Windows
Android
Android Tablet
18 RealPopup LAN chat alternatives
Intra-office communication is essential to modern businesses; you need to be able to call your employees to meetings or update a project group quickly, easily and securely. As we all know, Internet IM applications are neither necessarily fast nor safe, and with security issues...
Suggest and vote on features
RealPopup LAN chat Features
Messenger
LAN