Mio vs SlackBridge
Mio is an enterprise platform-interoperability product that connects Microsoft Teams, Slack, Google Chat, and Zoom across an entire organization. SlackBridge is a self-serve per-channel real-time bridge specifically between Slack and Microsoft Teams. They solve different problems for different buyers.
Quick answer. Mio is sales-led enterprise software with custom-quoted pricing and a requirement that every user in the organization be licensed. SlackBridge is self-serve with published pricing — free for one channel, $49.99/month Pro per Slack workspace — and does not require the Microsoft Teams side to purchase anything. Choose Mio for whole-organization platform interoperability across four chat platforms. Choose SlackBridge for per-channel Slack ↔ Microsoft Teams bridging in an agency, MSP, or consultant scenario.
Key differences
- Pricing model
- Mio: custom-quoted, sales-led, annual prepayment, no public pricing. SlackBridge: published, self-serve. Free tier for one bridged channel; Pro at $49.99/month per Slack workspace.
- Licensing scope
- Mio's pricing page states that all users in the organization must be licensed — no departmental or subset licensing. SlackBridge is licensed per Slack workspace, regardless of user count, and you can bridge to multiple client Teams tenants under one subscription.
- Free tier
- Mio: no free tier. Proof-of-concept testing available on request. SlackBridge: free tier bridges one channel forever.
- Setup model
- Mio: sales discovery call → enterprise contract → IT-led rollout. SlackBridge: self-serve OAuth on the Slack side and Microsoft Graph admin consent on the Teams side. Typically operational in under 15 minutes.
- Platforms bridged
- Mio: Microsoft Teams, Slack, Google Chat, Zoom (and combinations thereof). SlackBridge: Slack ↔ Microsoft Teams only.
- Granularity
- Mio: organization-wide platform interoperability across all licensed users. SlackBridge: channel-to-channel mapping — you explicitly pick which Slack channel bridges to which Teams channel.
- Cross-organization fit
- Both support cross-organization use cases. Mio's External Chat Sync works best when both organizations are enterprise Mio customers. SlackBridge requires only the Slack-side organization to subscribe; the Teams-side organization grants a Microsoft Graph consent and uses SlackBridge as a regular Teams app.
- Built by
- Mio: m.io, Google's official interoperability partner. SlackBridge: Square Post Labs Inc.
Side by side
| Mio | SlackBridge | |
|---|---|---|
| Pricing | Custom-quoted, sales-led, annual prepayment | Published: free tier; Pro at $49.99/month per Slack workspace |
| Licensing scope | All users in the organization required | Per Slack workspace; user count not metered |
| Free tier | No (proof-of-concept on request) | Yes (one channel, no expiry) |
| Setup model | Sales discovery → enterprise contract → IT-led rollout | Self-serve OAuth + admin consent in under 15 minutes |
| Platforms supported | Microsoft Teams, Slack, Google Chat, Zoom | Slack ↔ Microsoft Teams |
| Granularity | Organization-wide platform interop | Channel-to-channel mapping |
| Direct messages | Supported | Not supported (channels only — intentional for audit clarity) |
| Message storage | States messages are not stored | Zero — messages relayed in-memory on Cloudflare Workers, never persisted |
| Compliance posture | Enterprise (SOC 2 Type II, ISO 27001 per public documentation) | Controls aligned with SOC 2 Trust Service Criteria; formal Type II audit planned. Cloudflare infrastructure: SOC 2 Type II, ISO 27001, PCI DSS L1, GDPR. |
| Microsoft Teams permissions | Custom per enterprise deployment | Two tiers. Standard tier requests 6 read-mostly Graph permissions. Advanced (auto-install) adds 4 more, all revocable after setup. |
| Vendor | m.io (Google's official interoperability partner) | Square Post Labs Inc. |
When Mio is the right choice
Mio is the right choice when:
- You are a 500+ employee enterprise with a heterogeneous chat stack — Microsoft Teams, Slack, Google Chat, and Zoom all used by different teams inside your own organization.
- You're consolidating after an M&A and need platform interop while transition plans settle.
- You have budget and procurement bandwidth for sales-led enterprise software with annual prepayment.
- You need cross-platform direct messages, not just channel-to-channel mirroring.
- You want a vendor with Google's official interoperability partnership behind it.
When SlackBridge is the right choice
SlackBridge is the right choice when:
- You're an agency, MSP, or consultant whose internal team lives in Slack.
- Your enterprise clients live in Microsoft Teams and aren't switching.
- You want to start free, evaluate self-serve, and pay only when you're getting value.
- You want bridging on a specific channel, not a platform-wide org consolidation.
- Your clients aren't going to buy or run their own bridging software — they just need to approve a Microsoft Graph consent and you handle everything else.
- Published, predictable pricing matters to you.
Frequently asked questions
Can I use SlackBridge if my client is on Mio?
Yes. Your client doesn't need to be a SlackBridge customer at all. They consent once to a Microsoft Graph permission on their Microsoft Teams tenant. SlackBridge runs entirely on your side; Mio (or its absence) on the client side does not interact with SlackBridge.
Does Mio actually require every employee to be licensed?
Per Mio's published pricing page as of 2026, yes. "All users within your organization require a Mio license." There is no departmental or subset licensing option. SlackBridge, by contrast, is licensed per Slack workspace and does not meter users.
Why doesn't SlackBridge bridge Google Chat or Zoom?
SlackBridge is focused on the specific pain point of agencies and consultants who live in Slack and need to talk to clients on Microsoft Teams. We do that one bridge with channel-level mapping, real-time delivery, zero message storage, and transparent pricing — rather than spreading thin across four platforms.
What if I want to migrate from Mio to SlackBridge (or vice versa)?
Neither product migrates historical messages; both relay in real time. Switching between bridging tools is generally as simple as turning off the old bridge and connecting the new one to the same Slack and Teams channels. Email [email protected] if you want help planning a switchover.
Is this comparison biased?
It's written by SlackBridge, so the framing of "when to choose each" reflects our view of the buyers we're built for. The factual rows in the comparison table (pricing model, licensing scope, platforms supported, setup model) are sourced from Mio's public documentation as of 2026-05-14. If anything is out of date or inaccurate, please tell us and we will correct the page.
Sources and verification
- Mio pricing model, licensing scope, and supported platforms: m.io/pricing (accessed 2026-05-14).
- Mio positioning and Google interoperability-partner relationship: m.io (accessed 2026-05-14).
- SlackBridge feature scope and pricing: slackbridge.com/pricing.
- This page summarizes publicly documented behavior of both products as of 2026-05-14. If anything has gone stale, please tell us.