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company:
tagline:
encrypted email with a free tier (1) ·
open-source Slack alternative with omnichannel support (1) ·
open-source Slack alternative with self-hosted free tier (1) ·
shared scheduling on your existing Nextcloud (1) ·
shared scheduling via self-hosted Nextcloud (1) ·
team messaging with channels and threads, not recommended (1) ·
team messaging with channels threads and integrations (1)
protocol:
url:
pricing:
amount:
$4.99/mo, or $3.99/mo billed annually (free tier available) (1) ·
$8.75/user/month (free tier available) (2) ·
Commercial/Government/Defense tiers are custom-priced (free self-hosted Community
edition available) (1) ·
Free -- it's an app on top of the Nextcloud instance you already run (1) ·
Free -- zero extra cost if you already run Nextcloud (e.g. for Office Suite).
If not, standing up Nextcloud itself is also a free self-hosted install (see that
entry for full pricing/hosting details). (1) ·
Professional $10/user/mo; Enterprise custom pricing (self-hosted free tier available) (1)
source license:
hosting:
description:
None (2) ·
'''Not recommended.''' Cloud-based team messaging platform with channels,
threads, and integrations. Free tier limits message history to 90 days and caps
integrations at 10. Included here for comparison against [[Mattermost]] and
[[Rocket.Chat]], the two self-hosted alternatives we do recommend. (1) ·
CalDAV-based shared calendaring app bundled with Nextcloud: team calendars,
event invites, resource booking. Zero extra infrastructure if your org already runs
Nextcloud for Office Suite (see that entry for full pricing/hosting details) -- this
is just enabling the calendar app on the same instance. (1) ·
Cloud-based team messaging platform with channels, threads,
and integrations. Free tier limits message history to 90 days and caps
integrations at 10. (1) ·
MIT-licensed, self-hostable team chat with channels, voice/video, and broad
integration support. Its omnichannel inbox unifies live chat, email, WhatsApp, and
Telegram into one agent queue -- useful if you also want to replace a separate
customer-support tool, not just internal chat. (1) ·
Self-hostable, MIT-licensed team chat closely modeled on Slack's channel-based
UX -- includes a Slack export/import path to ease migration. Free self-hosted tier
runs indefinitely with no per-seat licensing cost; paid tiers add SSO, compliance
exports, and HIPAA/FedRAMP-aligned deployment options. (1)
usage notes:
None (1) ·
Fewer native integrations than Slack out of the box -- most third-party
connections go through incoming/outgoing webhooks rather than a marketplace, so budget
some setup time. Good fit for teams that want a near drop-in Slack replacement and
value Go-based, ops-friendly self-hosting. (1) ·
Guest access available on paid plans for external collaborators.
Slack Connect allows cross-organization channels with other Slack workspaces. (1) ·
Has the most GitHub momentum of the self-hosted Slack alternatives
(~45k stars). The free Community edition covers most day-to-day needs; exceeding
Starter-plan limits blocks adding new users but does not lock you out of existing
data. (1) ·
Syncs with any CalDAV-compatible client (Thunderbird, most phone calendar
apps) so people aren't locked into a web UI. (2) ·
Zero-access encryption means Proton cannot read message content or hand
it over even under legal request -- worth flagging for teams handling sensitive
organizing communications. No self-hosting option; mail is hosted on Proton's own
infrastructure in Switzerland. (1)
rejected alternatives:
category: (Click arrow to add another value)
Showing below up to 7 results in range #1 to #7.