Qualitative comparison only — what each assistant is best for, and where to be careful. Checked October 26, 2026. Features and pricing change, so verify on the official site before buying.
| Tool | Best for | Free tier | Works best in | Human review |
|---|---|---|---|---|
| ChatGPT (OpenAI) | Drafting, brainstorming, general business writing | Available | Any browser | Always review before sending |
| Claude (Anthropic) | Long documents and careful analysis | Available | Any browser | Always review before sending |
| Google Gemini (Google) | Work inside Google Workspace | Available | Gmail, Docs, Sheets | Always review before sending |
| Microsoft Copilot (Microsoft) | Work inside Microsoft 365 | Available | Word, Excel, Outlook, Teams | Always review before sending |
| DeepSeek (DeepSeek) | Budget-friendly analysis and drafting | Available | Any browser | Always review before sending |
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