SlackBridge
What SlackBridge is
SlackBridge relays messages between Slack and Microsoft Teams so teams can work in Slack while communicating with Teams clients. Messages and replies synchronize in both directions near real time through webhooks. Threaded replies are matched across platforms, although replies to parent messages older than seven days appear as new messages. Files move both ways in standard Teams channels, and Teams reactions map to Slack reactions; Slack reactions appear as visible messages in Teams. Mentions can cross platforms with exceptions for private or shared Teams channels and messages containing copied files. SlackBridge says message content is not stored at rest, while routing metadata for thread synchronization is retained for seven days. Connections use TLS 1.3, not end-to-end encryption. The web product has a free plan with one external connection and one channel bridge, plus Pro at $49.99 a month with two connections and five bridges. Both Teams setup methods require Microsoft 365 administrator approval.
Who it suits
SlackBridge suits digital agencies, consultants, managed service providers, IT providers, and software vendors bridging client conversations between Slack and Teams. It is for web users who need synchronized channels and replies.
What it does well
- Two-way near-real-time message sync
- Thread matching across platforms
- Files shared in standard Teams channels
- Unlimited message history
- Free plan available
What to know first
- Older thread replies become new messages
- Mentions have channel and file exceptions
- Not end-to-end encrypted
- Microsoft 365 admin approval required
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Pro | per month · 2 external organizations · 5 linked channels · Bi-directional messaging · Priority support · Extra organization: $10/mo (includes an extra channel) · Extra channel: $5/mo | $49.99 a month |
| Free | per month · 1 external organization · 1 linked channel · Bi-directional messaging · Community support | On request |
As slackbridge.com lists them, read 10 Oct 2026. The maker's own page has the final word.
Verdict
SlackBridge focuses on practical Slack–Teams channel bridging with free and Pro capacities. Check its thread, mention, security, and permission limitations before connecting workspaces.
Facts from SlackBridge's own pages
- Channels
- Yes · slackbridge.com, 23 Sept 2026
- Compliance
- SlackBridge says its controls align with SOC 2 Trust Service Criteria, but it has not completed a formal audit and does not hold its own SOC 2 or ISO 27001 attestation. · slackbridge.com, 10 Oct 2026
- Encryption
- SlackBridge says connections use TLS 1.3 and clarifies that transport encryption is not end-to-end encryption. · slackbridge.com, 10 Oct 2026
- Files and reactions
- Files can be shared in both directions in standard Teams channels, and Teams reactions map to Slack reactions while Slack reactions appear as visible messages in Teams. · slackbridge.com, 10 Oct 2026
- Free plan
- Yes · slackbridge.com, 23 Sept 2026
- Guest access
- Yes · slackbridge.com, 23 Sept 2026
- Integrations
- The product connects Slack workspaces with Microsoft Teams tenants using the Microsoft Graph API. · slackbridge.com, 10 Oct 2026
- Intended users
- SlackBridge identifies digital agencies, consultants and advisors, MSPs and IT providers, and software vendors as intended users. · slackbridge.com, 10 Oct 2026
- Maker
- SlackBridge identifies itself as a Square Post Labs Inc. product. · slackbridge.com, 10 Oct 2026
- Mentions
- Mentions can notify people across platforms, but are unavailable in private or shared Teams channels and in messages whose files SlackBridge copies. · slackbridge.com, 10 Oct 2026
- Message history
- unlimited · slackbridge.com, 23 Sept 2026
- Message sync
- Messages and replies sync in both directions in near real time using webhooks rather than polling. · slackbridge.com, 10 Oct 2026
- Permissions
- Both Teams setup methods require Microsoft 365 tenant administrator approval; Core Bridging requests six Microsoft application permissions and Full Integration requests eleven. · slackbridge.com, 10 Oct 2026
- Supported platforms
- web · slackbridge.com, 23 Sept 2026
- Purpose
- SlackBridge relays messages between Slack and Microsoft Teams so teams can communicate with clients in Teams while staying in Slack. · slackbridge.com, 10 Oct 2026
- Security
- SlackBridge says message content is relayed without being stored at rest and retains routing metadata for thread synchronization for seven days. · slackbridge.com, 10 Oct 2026
- Support
- SlackBridge says it responds to support inquiries within one business day. · slackbridge.com, 10 Oct 2026
- Threads
- Threaded replies are matched across platforms, but replies to parent messages older than seven days arrive as new messages rather than in the thread. · slackbridge.com, 10 Oct 2026
Where SlackBridge stands on Freedom251
- Team chat apps#42 of 63