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 per-user pricing, a one-year minimum commitment and a $10,000 one-time implementation fee. SlackBridge is self-serve with published pricing - free for one channel to one Teams connection, $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, no public per-user rate; a one-year minimum commitment and a $10,000 one-time implementation fee are published. SlackBridge: published, self-serve. Free tier for one bridged channel to one Teams connection; Pro at $49.99/month per Slack workspace.
- Licensing scope
- Mio licenses per user, and states you can license only the subset of users who need cross-platform chat rather than the whole organization. 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: the free tier bridges one channel to one Teams connection, with no expiry.
- 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. Mio's own website describes the company as "Google's official interoperability partner"; note that on 2025-08-01 Google announced that Chat ↔ Microsoft Teams interoperability is now delivered through NextPlane OpenHub. SlackBridge: Square Post Labs Inc.
Side by side
| Mio | SlackBridge | |
|---|---|---|
| Pricing | Custom-quoted, sales-led, per user; one-year minimum and a $10,000 implementation fee | Published: free tier; Pro at $49.99/month per Slack workspace |
| Licensing scope | Per user, limited to the users who need cross-platform chat | Per Slack workspace; user count not metered |
| Free tier | No (proof-of-concept on request) | Yes (one channel, one Teams connection, 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. Core Bridging requests 6 read-mostly Graph permissions. Full Integration requests 11: those 6 plus 4 write permissions for auto-install, plus Sites.Selected, which grants nothing until an administrator names a specific SharePoint site. Consent is revocable, though revoking one disables whatever depends on it, such as file copying. |
| Vendor | m.io. Self-described as "Google's official interoperability partner"; Google's 2025-08-01 update names NextPlane OpenHub as the Google Chat ↔ Teams interop provider. | 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 a one-year minimum commitment and a five-figure implementation fee.
- You need cross-platform direct messages, not just channel-to-channel mirroring.
- You want a vendor whose marketing emphasizes a long-standing Google interoperability relationship (verify the current Google-named interop provider, which as of 2025-08 is NextPlane OpenHub).
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 approve a Microsoft Graph consent and have the SlackBridge Teams app installed once, 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, and the SlackBridge Teams app is installed there: automatically under Full Integration, or under Core Bridging by an admin uploading it and adding it to each bridged team. Private and shared Teams channels also need the app added to the channel itself. SlackBridge is billed entirely on your side; Mio (or its absence) on the client side does not interact with SlackBridge.
Does Mio require every employee to be licensed?
No. Mio's pricing page states that only the users who need cross-platform chat require a Mio license, and that you can license just that subset rather than the whole organization. Mio does publish a one-year minimum commitment and a $10,000 one-time implementation fee. SlackBridge, by contrast, is licensed per Slack workspace and does not meter users at all.
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 support@slackbridge.com 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, implementation fee and minimum commitment: m.io/pricing (re-verified 2026-09-26; an earlier version of this page cited an all-users licensing requirement that Mio's pricing page no longer states).
- Mio positioning and "Google's official interoperability partner" claim: m.io (accessed 2026-05-14, still present 2026-09-26).
- Google's current public statement on Google Chat ↔ Microsoft Teams interoperability: Google Workspace Updates, 2025-08-01 - names NextPlane OpenHub.
- SlackBridge feature scope and pricing: slackbridge.com/pricing.
- Mio pricing, licensing scope, implementation fee and minimum commitment were re-verified 2026-09-26. The remaining rows summarize publicly documented behavior of both products as of 2026-05-14. If anything has gone stale, please tell us.