Flock vs Keybase

They have apps for Windows, Mac, Chrome, iOS, Android and web interface. And all the chat sessions are always on sync.

It is half the price of Slack and full of nice features like polls, assign to do's, etc.

Unlike its rivals, it not only allows you to receive events, but also allows you to push content to it and receive various user action events.

Moving a team or organization to flock does not require any setup from the company's IT team. At max, what might be required would be to whitelist their domain in case the organization's IT team has gotten external domains blocked. You can simply download Flock and invite others in your organization by using their email ids in order to start collaborating. That's all there is in the name of setup.

Most of its features are free, even video conferences. But also they have a Pro version with unlimited chat history, Active Directory integration among other things.

There is no limit on the number of groups or of group members. Similarly, within a team you can have unlimited members. There is no limit of number of teams too.

Flock is offering an app that is faster than Slack.

For every team, the permissions and restrictions can easily be set over the participating members and the conversations they are having.

Posting messages is more fun with them in addition to emojis.

There are multiple options like slash commands, message buttons, chat buttons, attachment picker etc., where the integrations can surface inside the native app. This greatly eases the discoverability of a integration, making it really easy for the team members to find and use the integrations.

Completely end-to-end encrypted.

Users can publish proofs of identity (PGP public key, Twitter, Facebook, etc).

Free (as in beer) and Open Source Software.

Securely share files.

For sharing files publicly.

250GB of free storage for encrypted files in a team.

Teams can be public with open access or admin-approved access. Opt-in to list public teams.

Teams can be completely private (access granted via admin-approval only, not publicly listed).

Encrypted private or team Git repositories with automatic commit signatures.

Based on blockchain technology.

View/verify the cryptographic signature history of any user.

Encrypt/decrypt any PGP message or file with minimal effort.

Supports public key encryption.

Securely store personal files that only you can access.

Share files securely and privately with other users, a group of users, or a team.

250GB of free storage for privately-encrypted files.

Host a public static website for free. Sites are automatically viewable via keybase.pub if an index.html or index.md exist in your public files.

Teams are E2E encrypted, unlike Slack and other services.