Encrypted group chat & file sharing for your team, friends, or family.

Email sucks, collaboration rocks. Faster uploads, sharing & search than the other guys. Offline mode. Mobile & desktop. Password-less design. Unparalleled privacy.

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No credit card required.

“All content (including file attachments) is end-to-end encrypted so that even SpiderOak can’t read it. Easy to use and visually appealing.”
“If an attacker were to gain access to every corner of SpiderOak's corporate systems, it wouldn't let them read the conversations of the firm's customers. If you want to enjoy the benefits of collaboration apps and don’t want to give up on your privacy, you might want to consider (Semaphor).”
The Daily Dot
“Slack, Hipchat and other collaboration tools are the cool kids these days. And while they do a lot well...there's something missing that can cost you your business. Privacy. Let's just say (Semaphor) is like Slack, but WAAAAY more secure.”
“One nice feature of Semaphor that Slack doesn't have: the ability for individuals to pay their own way.”

Productivity, Meet Privacy & Usability.

Privacy isn’t the only perk of Semaphor. Whether you are busy working on a project, organizing an event, or creating a discussion around a special topic, use Semaphor to help. Get started by creating as many Teams and Channels as you want. Then invite your friends, family, or coworkers. Start communicating and collaborating securely. (Bye-bye email!)

You can even create your own personal channels for saving notes, links, files, ideas, and anything else you may need. You'll never need to email a file to yourself again.

Your ideas matter! Protect them.


From its password-less design to fast file sharing, Semaphor is the only group chat application that is built from the ground up for privacy and security.

With Semaphor, you never have to remember a password, pre-encrypt a sensitive document or worry about a third party reading your messages. Your data is only visible to you and the people you choose to share it with. No one else.

Collaboration in the WildVideo, 00:30sec
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Crazy Fast Search & File Sharing.

Semaphor retains your conversations and data from day one. If you ever need to go back and find a file or conversation, use the search bar — even if you’re not connected to the internet. Standard and Pro accounts have access to unlimited conversation history. Because Semaphor is an application downloaded to your device, and not in a web browser, search is crazy fast. If you put us up against the competition, we'll beat them hands down. Other perks of being an application on your device include multi-file uploads, concurrent downloads (you can start downloading a file before it's even finished uploading!). Large file support up to 2GB.

No matter what you're working on or searching for, you can stay productive on your mobile device or at your desk. Unlock unlimited search history for only $9/month.

Password-less design for added security

Every message & file is cryptographically secure

Reviewable source code

Only $9 per user/month

Markdown support

Unlimited teams & channels

Always-available offline mode

Multi-file uploads & concurrent downloads

Available for desktop & mobile

Create public teams & auto-accept join requests

Join with email address or a username

30-day message history for free accounts, unlimited history for paid accounts

Supports bots & integrations

Cultivate trust with trusted contacts

Large file support, up to 2 GB

Get started with Semaphor today, for free.