Email vs Slack vs Teams
"Just Slack me." "Send me a Teams message." "Email me." Three different requests, three different tools — and increasingly, nobody's sure which to use when.
The modern workplace runs on all three simultaneously. But the overlap creates confusion, duplicated communication, and the nagging feeling that important information is scattered across too many places. Instead of simplifying work, we've multiplied the channels we need to monitor.
Here's an honest breakdown of when each tool actually excels — and where each falls short.
Slack: the digital hallway
Best for: Quick questions, real-time coordination, team banter, rapid decision-making, and informal communication within a team.Slack excels at replacing the kind of communication that used to happen by walking to someone's desk. "Hey, is the deployment ready?" "Can someone review this PR?" "Lunch at 1?" These are inherently real-time, informal, and ephemeral. Slack handles them perfectly.
Channels organize conversations by topic, project, or team. Threads (when people actually use them) keep discussions contained. Integrations with development tools, project management, and other services make Slack a legitimate productivity hub for technical teams.
Where Slack struggles: Anything that needs to persist, be referenced later, or cross organizational boundaries. Slack conversations are inherently noisy and chronological — important decisions get buried under casual chatter. The free tier deletes history after 90 days. External communication requires Slack Connect, which adds friction. And for long-form, considered communication, Slack's instant-message format actively discourages thoughtfulness.
Microsoft Teams: the corporate Swiss Army knife
Best for: Organizations deeply embedded in the Microsoft 365 ecosystem, video meetings, and team collaboration with tight Office integration.Teams tries to be everything: chat, video calls, file sharing, task management, and collaboration — all in one platform. For companies already using SharePoint, OneDrive, and Outlook, Teams ties it all together. Video meeting quality is solid, and the integration with Office documents (co-editing in Teams) is genuinely useful.
Where Teams struggles: The "everything platform" approach means it does many things adequately but few things exceptionally. The chat experience is slower and less intuitive than Slack. Navigation is confusing — channels, chats, teams, and meetings blur together. Notifications are aggressive and hard to tame. And like Slack, it's designed for internal communication; external correspondence still requires email.
Email: the universal protocol
Best for: External communication, formal correspondence, anything that needs a paper trail, detailed or long-form messages, and communication that crosses organizational boundaries.Email remains the only communication medium that works universally. You don't need to be on the same platform. You don't need an invitation, a license, or a workspace. Every professional has an email address. Every organization uses email for external communication. Contracts, proposals, invoices, legal notices, partnership discussions — these live in email because email provides the permanence, formality, and universality that chat tools cannot.
Email is also inherently asynchronous. Unlike chat, where a message creates implicit pressure to respond immediately, email allows considered, thoughtful responses on the recipient's timeline. For complex topics that require careful thought, email's format encourages better communication.
Where email struggles: Real-time coordination, quick questions, and informal team communication. These are genuinely better suited to chat. Email's formality and structure — which are strengths for important communication — become overhead for simple interactions. And traditional email clients make the experience worse by failing to organize, prioritize, or provide intelligence — turning every inbox into a cluttered dumping ground.
The right tool for the right job
The answer isn't one tool to rule them all. It's using each where it excels:Use Slack/Teams for: Quick questions, real-time updates, informal coordination, team discussions, and anything that's conversational and time-sensitive within your organization.
Use email for: External communication, formal requests, detailed updates, anything requiring a record, considered responses, and communication with anyone outside your immediate team or organization.
The overlap zone: Internal project updates, meeting follow-ups, and cross-team coordination can go either way. The rule of thumb: if it needs to be referenced in a month, email it. If it's relevant for a day, chat it.
The real problem: email clients haven't kept up
Slack and Teams succeeded partly because they're well-designed products that solve real problems. But they also succeeded because email clients gave them an opening. When your inbox is a disorganized mess where important messages drown in noise, of course you'd rather get a clean Slack notification.The solution isn't to abandon email for chat. It's to make the email experience as intelligent and organized as the chat experience — while preserving email's unique strengths of universality, persistence, and formality.
That's precisely what Faraday does. Every email automatically classified, important messages surfaced, noise organized out of the way — the same clarity that makes Slack feel manageable, applied to the communication channel that handles your most important correspondence.
Slack for the quick stuff. Teams for the meetings. And Faraday for the communication that actually matters.