Is Grok for Excel free? Not for your business.

The headlines last week were hard to miss. Grok is now inside Excel, Word and PowerPoint, and it is free. Free AI in the apps you already use, undercutting the thing Microsoft charges you for.

So, is Grok for Excel free? The add-in is. The AI behind it is not. And for a business, the version you would actually need costs more than the Copilot you were thinking about cancelling.

Here is the honest math.

What actually shipped

SpaceXAI, the company that was called xAI until it rebranded in early July after the SpaceX merger, has been quietly filling in the Microsoft Office lineup. PowerPoint and Word got Grok add-ins in June. Excel landed on July 20. Outlook followed a day later.

You install them from the Microsoft Marketplace like any other add-in. Grok shows up as a panel next to your document.

In plain English: it is a sidebar, not a rebuild of Office. It can read what you have selected, write things back into the file, and pull in outside context through connectors to SharePoint, Google Drive and your email.

What it does is genuinely useful. In Excel you can ask a question about a range in plain language and get an answer that cites the cells it used. You can describe a formula instead of writing it. You can run a what-if on next quarter’s numbers. In Word it turns notes into a structured draft. In PowerPoint it builds a deck from an outline.

None of that is nothing. It is a real tool.

The catch: “free” means free to install

Here is the part the coverage skipped.

The add-in downloads for free. Doing work with it draws on your Grok account, and SpaceXAI’s own announcement says the Excel add-in is currently available to SuperGrok, Heavy, Business and Enterprise plans. Those are the paid tiers. When The Register put the add-in through a real task and asked it to build a chart, it told them they had hit their usage limit and suggested an upgrade.

Your usage also comes out of one shared weekly pool across everything Grok does: chat, images, voice, code, and now the Office add-ins. So the person on your team who burns their allowance arguing with a chatbot on Tuesday has less left for the spreadsheet on Thursday.

SuperGrok runs about $30 a month for one person. Grok Business, the version built for teams, is $30 per seat per month.

So the free AI in Excel costs $30 a seat.

What this means for you

Run the numbers on a 12 person business.

Grok Business at $30 a seat is $360 a month, or $4,320 a year.

Microsoft 365 Copilot Business, the add-on for companies on an eligible Microsoft 365 Business plan, is $21 per user per month on an annual commitment. That is $3,024 a year. Microsoft is also running a promotion at $18 per user per month between July 1 and September 30, 2026, annual commitment, first year only. That takes year one to $2,592.

Grok is roughly $1,300 to $1,700 a year more expensive for the same twelve people. For a tool that was reported as the free alternative.

There is a second cost that does not show up on an invoice. Copilot is a first-party feature of the Microsoft 365 you already administer. It inherits your tenant’s permissions and your compliance settings. Grok is a third-party add-in that each employee authorizes with their own account, and Microsoft’s own install warning says the app can read and change your document and send data over the internet. Grok Business does commit that customer data is not used to train models, which is the right commitment to want. But that protection comes with the paid business plan, not with someone’s personal SuperGrok login.

Which brings up the thing you should actually worry about. If someone on your team already pays for SuperGrok out of their own pocket and installs this add-in on the company’s financial model, you now have your customer data flowing through a consumer account you do not control and cannot audit. That is not a Grok problem. That is the shadow AI problem wearing a new hat, and this add-in makes it a two-click job.

Do this instead, this week

Before you buy anything, check what you are already paying for.

If you have an eligible Microsoft 365 subscription, Copilot Chat is included at no extra cost, with enterprise data protection, for anyone signing in with a work account. It is web-grounded chat rather than AI living inside your Excel cells, but for drafting, summarizing and thinking out loud it covers a surprising amount of what people are reaching for. Most small businesses we talk to are paying for it and not using it.

The paid Copilot license is what puts the assistant inside Word, Excel, PowerPoint and Teams. That is the real upgrade decision, and it is a much smaller step than adding a whole second AI vendor.

Then do the boring thing: tell your team, in writing, that personal AI subscriptions do not get installed on company files. One sentence. Today.

The verdict

Not yet.

Grok’s Office add-ins are competent and the Excel one is legitimately good at explaining its own answers. But the pitch that landed in your feed, free AI that beats paying Microsoft, does not survive contact with the pricing page. For a small business on Microsoft 365 you would pay more, get less integration, and add a third-party vendor to your data map.

If you are a solo operator who already pays for SuperGrok, install it. It is a free bonus on a subscription you already have, and the Excel panel is worth the ten minutes.

If you run a team on Microsoft 365, this is not your move this quarter. Turn on what you already own, decide whether paid Copilot earns its $21, and watch this space. SpaceXAI is clearly aiming at Microsoft’s seat revenue, and the second act of a price war is usually better for buyers than the first. Just do not confuse a press cycle with a price.

Reading about AI is free. Getting it wrong isn’t. If you want someone to look at what you are actually paying for across Microsoft 365 before you add another subscription to the pile, that is BlueFort IT’s day job. And if you want the same treatment for the rest of the noise, we also broke down Copilot Cowork’s per-task billing and OpenAI’s small business push.