Apps, integrations & Connect
Free tier caps you at 10 integrations and Slack Connect needs every external party on a paid plan — useful collaboration ends up gated behind seat licences on both sides.
What people actually say
✕Slack Connect requires both organisations to be on a paid plan, and partners on Pro or above still consume per-seat billing on their side — collaboration across many small partners adds up fast.
Source: ClearFeed, Slack Connect FAQ ↗✕Free workspaces are limited to 10 app integrations, and going beyond that requires upgrading to Pro at minimum.
Source: Slack, Free plan limits ↗✕Licence-management vendors flag that multi-channel guests, deactivated-but-unreclaimed seats and untracked Connect channels routinely cause cost overruns that admins only notice at renewal.
Source: Zylo, Slack licence management ↗
Integrations are plain webhooks plus a Bolt-style event router in your repo — Linear, GitHub, Sentry and PagerDuty wire in as 30-line handlers. Cross-org collaboration runs over a shared-channel table you control, not a vendor product you pay both sides of.