Product Cost / 1000 users pa Self-Host Option Mobile Client Space Search History Video Calls Screen Sharing App Integration Limitations Integration Apps Guest Accounts Share Channels with other Companies OAuth with Google Custom retention policies Analytics End-to-End encryption Open Source Software Post with Photo, Threading, Formating?

Slack Free $0.00 N Y 5 GB Total for Workspace 10,000 1-1 N 10 AttendanceBot, Voting, Appear.in, Dropbox, Google Drive, Gogle Hangouts, Trello, Twitter, Wunderlist, Simple Poll, Donut, Self-CRM, Evernote, SurveyMonkey, Zapier, GitHub, BitBucket, Jenkins CI, Sentry, LucidChart, Jira, Nagios, many more. XMPP and IRC disconinued. N N N N Y N Yes - All. Photo is added to post and displayed

Slack Standard $80,040.00 N Y 10 GB storage per member Unlimited 15 Y Unlimited Y Y Y Y Y N

Slack Plus $150,000.00 N Y 20 GB storage per member Unlimited 15 Y Unlimited Y Y Y Y Y N

Slack Enterprise Quote ? Y 1 TB GB per user Unlimited ? Y Unlimited Y Y Y Y Y N

Riot.im $0.00 Y - or use Matrix Y 100MB per upload limit Unlimited Multi-User Y - Jitsi Unlimited Slack, Gitter, Twitter, IRC, SMS, Github, Travis CI, Etherpad (doc collaboration), Giphy, Guggy, Wikipedia, Google, Imgur, RSS, XMPP, Rocket Chat, iMessage, Facebook, Minecraft, Instagram, Gyr, Telegram, Twillio, E-mail, Last.FM, Jitsi VC, Spotify. Y Y and to Slack N ? ? Y Y Yes - it includes a link/s each expanded under the post with the graphic. Uploading a photo puts it in a separate post.

Zulip Free $0.00 Y Y Unlimited Unlimited Y - Jitsi, and can use Zoom, Google Chat/Video too Y - Jitsi Unlimited Trac, Nagios, GitHub, Jenkins, Threaded Conversations, IFTTT, Airbrake, Asana, App Follow, Assembla, Basecamp, Beanstalk, Bonusly, Beeminder, Codebase, DropBox, Github, Gitlab, G Cal, G Translate, HelloSign, Jira, Jenkins, Intercom, Mention, New Relic, Opbeat, Pagerduty, Papertrail, RSS, Redmine, Sentry, Slack, Travis CI, Trello, Twitter, Updown, WordPress, Zapier, Zendesk, Facebook, Instagram, Home Assistant, and more. Y ? LDAP/AD Y Y Y Yes - All. Photo is added to post and displayed

Let's Chat $0.00 Y N No limit - can use S3 and Azure too Unlimited N N Limited choice XMPP, Zapier, Giphy ? ? LDAP/Kerberos N N ? Y

Mattermost Free $0.00 Y Y Y - no stated limit Unlimited 1-1 N Unlimited Jenkins, GitLab, GitHub, BitBucket, Jira, Twitter, Matterhorn, IRC, XMPP, Pidgin, Nagios, Golang, PivotalTracker, Zapier. N ? N - GitLab ? ? ? Y

Mattermost Enterprise E10 $39,000.00 Y Y Y - no stated limit Unlimited 1-1 N Unlimited N ? AD/LDAP ? Y Y N

Mattermost Enterprise E20 Quote Y Y Y - no stated limit Unlimited 1-1 N Unlimited N ? AD Fed/LDAP/ Google/O365/ SAML Y Y Y N

Rocket.Chat <5,000 users, 200 concurrent $2,400.00 N Y 1 TB Unlimited Y Y Unlimited Jitsi, GitHub, Trello, Guggy, Jira, G Cal, Sentry, BitRocket, Moodle, Dead Simple Screen Sharing, Zapier, Giphy, Jenkins, NewRelic, nixstats, Osticket, PagerDuty, Prometheus, ReplyGIF, ReviewBoard, RunDeck, Telegram, Travis CI, Uptime Robot, AppVeyor, Azure Alerts Y Y - Sameroom Portal 2FA In MongoDB? N In progress Y

Rocket.Chat Community $0.00 Y Y Y - no stated limit - S3, Minio, GridFS Unlimited Y Y Unlimited Y Y - Sameroom Portal 2FA In MongoDB? N In progress Y

Gridle $60,000.00 N? Y Unlimited Unlimited Y Y Unlimited Alfred PA, Projects, Tasks Y ? Y N?

Wire Personal $0.00 N Y Y - how much Y - limits? Y - group calling with up to ten participants and video conferences support up to four users. N N? N? N - only for paid N - but has group conversations not channels ? ? N Y Y N - chronological in group with mentions - no threading?

Wire Enterprise $90,000.00 Y Y Y - how much Y - limits? Y - group calling with up to ten participants and video conferences support up to four users. Different for Enterprise? Y Not mentioned Y - but not specified which Y Mentions guest rooms only ? Y - GDPR Y? Y ? N - chronological in channel with mentions - no threading?

Hipchat Data Center $24,000.00 Y - Cloud ready Y Unlimited Unlimited Y Y Unlimited O365, Salesforce, G Drive, Docusign, Dropbox, LucidChart, OpsGenie, PlanningWithCards, Instabug, HipGIF, Jira Issues, HTML Canvas (co-editing), Meekan scheduling, UberConference, TLDR, Jenkins, Gyazo, Sketchboard, Bonusly, Instawell, Convergely, GetBadges, Boxy, Transbot, Meta SaaS, Teamgo, Rollbar, Tap My Back, Zapier, Hootsuite, and more Y ? LDAP, Crowd, SAML 2 and others N

Microsoft Teams (without O365 at R65pm pp) - Max 300 users though $66,240.00 ? Y - but no Linux app 1 TB per user Unlimited Y - to 250 people Y ? Yammer, Who, Skype for Business, Adobe Creative Cloud, Adobe Sign, AirBrake, Aircall, Bizzy, Appsignal, Reminder, Bing News, Bitbucket, Trello (froma screenshot) but can't find real list of apps ? ? AD Y N

Gitter $0.00 ? Y Unlimited ? ? Unlimited GitHub, Trello, Jenkins, Travis CI, Heroku, Sentry, BitBucket, HuBoard, Logentries, Pagerduty & Sprintly, IRC Bridge. We accept custom webhooks. Y Github N

eXo Enterprise <1,000 users, 300 concurrent $27,000.00 Y Y Unlimited Unlimited Y - no details Unlimited BonitaSoft, SharePoint, G Drive, Outlook, Intercom, Skype for Business, Lecko Analytics, Enterprise Skin, Wikis, ElasticSearch, MS Exchnage, Gallery, MS Outlook, SalesForce, MS SQL Server, Tasks, Q&A, Atemis Cloud Y ? AD, LDAP, Various SSO and 2FA ? Y Y - G Cloud Y

Matrix is an open network for secure, decentralised communication delivering a community of users, bridged networks, integrated bots and applications plus full end-to-end encryption.

See https://matrix.org/#about