Slack Connect is Slack's native solution for external collaboration. It lets users in different Slack workspaces share channels without leaving Slack. It's well-built and works well for what it's designed to do.

TetherChat is built for a different problem: connecting people who are on different platforms. Slack to Teams. Discord to Slack. Teams to Teams (across tenants). Any combination of the platforms your team and your external partners actually use.

If both parties are on Slack, Slack Connect is probably the right choice. If they're not, it isn't — and that's where TetherChat comes in.

What Slack Connect does well

Slack Connect channels live inside Slack, look like regular channels, and behave like regular channels. There's no app to install beyond Slack itself.

It supports DMs between users in different workspaces, not just shared channels — useful for one-on-one relationships that don't need a full shared channel.

Full Slack feature support, including reactions, threads, mentions, and rich formatting. And if you use Slack workflows, bots, or integrations in your own workspace, those can interact with Slack Connect channels.

Where Slack Connect falls short

Both parties must be on Slack. If your partner, customer, or vendor is on Teams or Discord, Slack Connect doesn't help. You'd be asking them to install and use Slack — creating friction that reduces adoption and often fails with enterprise IT departments.

Slack Connect requires both workspaces to be on paid plans. Free Slack workspaces can receive Connect invitations but can't initiate them. For partners or customers on the free tier, this creates an obstacle.

Each new Slack Connect channel requires a workspace admin to approve it. For organizations with strict IT governance, this creates delays for every new external relationship.

And there's no cross-platform support at all. If your organization also needs to connect with Teams users, Discord communities, or future platforms, Slack Connect doesn't address those use cases. You'd need separate solutions for each.

What TetherChat does well

TetherChat connects any two supported platforms — Slack to Teams, Discord to Slack, Teams to Discord, Slack to Slack (different workspaces), Teams to Teams (different tenants). You're not constrained by what platform the other side uses.

Both sides work natively. A Slack user and a Teams user in a bridged channel each see messages in their own platform, with real sender attribution. Neither side installs a new app — they install TetherChat once, and it handles all their bridges from that point forward.

TetherChat works regardless of each organization's Slack or Teams subscription tier. And the app installs at the workspace level once; individual bridges are created by users with a slash command, no admin approval needed per channel.

The decision framework

| Situation | Better Choice | |---------|---------------| | Both parties are on Slack | Slack Connect | | One party is on Teams, other on Slack | TetherChat | | Both parties are on Teams (different tenants) | TetherChat | | Community on Discord, internal team on Slack | TetherChat | | Managing many external relationships across mixed platforms | TetherChat | | Need DMs between two Slack users, different workspaces | Slack Connect | | Enterprise partner with IT restrictions on external Slack access | TetherChat |

The practical overlap

In practice, organizations often use both. Slack Connect for the external Slack-to-Slack relationships where both sides are on paid plans and admin approval is feasible. TetherChat for everything else — the Teams customers, the Discord community, the enterprise partners on Microsoft 365, the acquired company that hasn't migrated yet.

TetherChat is free during beta. If you're currently using Slack Connect for some external relationships and email for the rest, TetherChat fills the gap for all the non-Slack cases.