Decision Support · Side-by-side
Compare pricing, strengths, and use cases so it is easier to pick the right fit.
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Grammarly AI is the better choice for most everyday users who want polished, mistake-free writing across the web and apps—it's easier to start, works everywhere, and has a generous free tier. GPT for Gmail and Outlook is a niche power tool for spreadsheet-heavy professionals who need bulk email drafting or data analysis inside Google Sheets and Excel, but it's harder to set up and costs money upfront. The single biggest difference: Grammarly is a universal writing assistant, while GPT for Work is a spreadsheet automation agent that also does email.
GPT for Gmail™ and Outlook™
Grammarly AI (GrammarlyGO)
Scores at a glance
Choose GPT for Gmail™ and Outlook™ if
Choose Grammarly AI (GrammarlyGO) if
Key differences
Facts side by side
| GPT for Gmail™ and Outlook™ | Grammarly AI (GrammarlyGO) | |
|---|---|---|
| Free plan | ||
| Mobile app | ||
| API access |
Common questions
For a single polished email, Grammarly is faster and easier—it catches mistakes and adjusts tone in one click. GPT for Work is better if you need to summarize a long thread or draft dozens of personalized replies at once from a spreadsheet.
Yes, Grammarly has a mobile keyboard app for iOS and Android that checks your writing in any app. GPT for Work does not have a mobile app at all.
Both take privacy seriously. GPT for Work lets you use your own OpenAI API key so your data never touches their servers. Grammarly does not sell your data or train AI on your content, but their servers process your text to give suggestions.
Only if you regularly work with large spreadsheets or send bulk emails. For casual email writing, the free version of Grammarly gives you more immediate value at no cost.
Yes, that's one of its main features—it can write, check, and fix formulas, format cells, create charts, and analyze data directly in Excel and Google Sheets. Grammarly cannot do any of that.
Grammarly wins for everyday writing polish and ease; GPT for Work wins for spreadsheet automation and bulk email—choose based on whether you write more or calculate more.
If you just want to write better emails and documents without thinking about it, start with Grammarly's free tier—it's easy, works everywhere, and you'll see results in minutes. If you're a spreadsheet power user who needs to automate data tasks or send mass personalized emails, GPT for Work is worth the setup and cost. For 90% of people, Grammarly is the smarter first choice.
Detail pages: GPT for Gmail™ and Outlook™ · Grammarly AI (GrammarlyGO)
