xAI's Grok Add-Ins Are Free for Excel and Sheets, Paid for Outlook — the Split Tells You Where It Thinks the Value Is

xAI shipped a free Grok add-on for Google Workspace this week, installable once to work across Sheets, Slides, and Docs — in Sheets it answers questions from spreadsheet data while citing the specific cells it used, writes formulas, and reruns scenarios when assumptions change. It’s the third leg of a productivity-suite push that started in Microsoft 365, and the pricing pattern across that earlier rollout is worth noting. Grok for Excel launched free, docked as a side panel that turns a plain-English request into formulas or a rebuilt forecast without the user reconstructing the logic by hand. Grok for Outlook launched a week later restricted to paid X and SuperGrok subscribers — the same underlying model, gated behind a subscription specifically for the inbox use case.

That split is a legible signal, not an accident. Spreadsheet and document assistance is table stakes now — free, competing directly with Gemini in Docs/Sheets and Copilot in Word/Excel, priced to drive adoption. Email is where xAI is willing to charge, likely because inbox access is the more sensitive surface: xAI states explicitly that no conversation data processed through the Outlook, Word, Excel, or PowerPoint connectors is stored on its own servers or used for training — a privacy commitment it doesn’t lead with in the free-tier tools, because it doesn’t need to sell trust to get someone to try a formula generator.

For consulting engagements advising on AI tool procurement across a Microsoft- or Google-centric org, the read isn’t “which assistant is best.” It’s that vendors are now pricing productivity AI by data sensitivity, not by feature count — and a rollout that’s free in the spreadsheet and paid in the inbox is telling you exactly where that vendor thinks the real risk, and the real willingness to pay, lives.