Search for "connect Slack to Teams" and you'll find dozens of options. Zapier integrations, webhook relays, Teams connectors, custom bots, third-party apps. They all claim to solve the same problem. Most solve a different, smaller problem and hope you don't notice until you've paid for a year.

Here's what actually matters when evaluating a cross-platform chat integration — and the specific failure modes that make certain approaches look good in a demo but fall apart in daily use.

The three categories

Cross-platform chat integrations fall into three categories, and understanding the differences matters more than any feature comparison.

Webhooks post a notification from one platform to another. When a message is posted in Slack, a webhook can trigger a message to appear in Teams — or anywhere that accepts an HTTP POST request.

They're simple to set up and widely supported. But they're one-way. People on the Teams side can read Slack messages, but replies in Teams don't go back to Slack. You've created a bulletin board, not a conversation. Every message appears as coming from the webhook bot, not from the actual sender — "Slack Integration posted: John said..." is a feed, not a chat. Thread support is usually garbled or missing entirely. And webhooks break when platform APIs change or tokens expire; someone has to maintain them.

Webhooks are appropriate for one-way notifications: "alert the on-call channel when this monitoring system fires." They're not appropriate for two-way conversation.

Bots are apps that read messages in one platform, process them, and post to another. More sophisticated than a webhook — they can handle two-way communication, threading, and richer formatting.

The problems look similar though. Most bots post messages attributed to the bot, not to the original sender. "TetherBot (as John Smith): Hello, are we still on for tomorrow?" breaks conversation flow and makes participants feel like they're talking to a relay. Feature support is usually partial — reactions may not sync, thread replies may appear in the wrong place, formatting is inconsistent. Latency is fine in low-volume channels and maddening in high-volume ones. Many bot implementations require service accounts, admin tokens, or API keys that create ongoing security and maintenance overhead.

The key question to ask any bot-based solution: does the message appear with the actual sender's name, or with the bot's name?

Native bridges integrate directly with each platform's API and sync messages bidirectionally with real attribution. The sender appears as themselves on both sides. The conversation behaves like a normal conversation in each platform.

What to watch for even with native bridges: platform API changes can affect any integration over time, some implementations require both sides to have enterprise-level plans, and setup requires installation on both sides which can involve admin approvals.

TetherChat is a native bridge. When a Slack user sends a message, the Teams user on the other side sees that message with the Slack user's name and avatar, not a bot handle.

Questions to ask before committing

Does the message appear with the real sender's name on both sides? If the answer involves "bot" or "integration" in any way, that's a signal.

Is it truly bidirectional? Replies in platform B should appear in platform A. Ask for a demo that shows this explicitly.

What happens when someone replies in a thread? Thread handling is where most integrations reveal their limitations.

What does admin setup require? Enterprise IT requirements and admin approval timelines matter for rollout speed.

What does it cost per channel, per seat, or per message? Per-seat pricing can make cross-company channels expensive because you're paying for users in another organization.

What's the failure behavior? If the integration goes down, do messages queue and deliver later, or are they lost?

What good looks like

A well-designed cross-platform chat integration should be invisible. Both sides should feel like they're in a normal conversation in their own platform. The bridge shouldn't require ongoing attention, shouldn't break when either platform updates, and shouldn't require either side to change their workflow.

The test: ask someone on the other platform to use the bridge for a week without telling them anything about the technical implementation. If they describe it as "just a shared channel," you've found the right tool. If they describe it as "the thing where messages come from the bot," you haven't.

TetherChat is free during beta. Set up a test bridge with one channel and evaluate it against this standard before committing to anything.