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Editorial comparison for operators. Ratings are sample data unless verified.
| Attribute | Grammarly | Slack |
|---|---|---|
| Type | tool | tool |
| Summary | AI-powered writing assistant that checks grammar, tone, and clarity across emails, docs, and web forms. Grammarly for business helps operators ship polished customer-facing writing at scale. | Slack AI is a workplace messaging platform with integrated AI features for remote teams. Search conversations, summarize threads, and automate workflows in one centralized hub. |
| Pricing | freemium · See vendor site — sample data | freemium · See vendor site — sample data |
| Free trial | Yes | No / not listed |
| API | No / not listed | Yes |
| Open source | No | No |
| Editor rating | — | — |
| Categories | Writing & Content, Communication, Productivity | Communication, Team Collaboration, Workplace Tools |
| Key features | Real-time grammar, spelling, and punctuation checking across web forms, email, and docs · Tone detection flags passive voice, formality mismatches, and emotional clarity issues · Custom style guides and brand voice settings (verify on vendor site for Business tier) · Browser extension integration with Gmail, Slack, LinkedIn, Twitter, and web forms · Plagiarism detection and citation tools (Premium tier; verify current availability) | AI-powered search and thread summaries to find and digest past conversations · Channels, direct messages, and threaded replies for organized async communication · Workflow Builder for no-code automation of messages, notifications, and approvals · 2,000+ native integrations and API for custom apps and bots · Slack Connect for secure external collaboration with partners and vendors |
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