Microsoft Copilot vs. Free AI in Your Inbox: Is $30/Month Still Worth It in 2026?

I opened Excel last week to clean up a client budget, and for the first time I had two AI side panels staring at me instead of one — Copilot, which I'm already paying $30 a month for through my Microsoft 365 plan, and a new Grok icon sitting right next to it, free to install, asking if it could take a look at my spreadsheet instead. That's not a hypothetical. That's just what opening Excel looks like now if you've kept up with Microsoft 365 add-ins over the past six weeks.

My name is Artem, I run the Writingmate blog, and most of my job is testing whether AI subscriptions actually earn their keep or just ride on brand recognition. I've been paying for Microsoft 365 Copilot since it launched, mostly out of habit at this point. So when xAI started shipping Grok into every major Office app between June and July 2026, I didn't want another "Grok is great, actually" post — I wanted to know if I could cancel the $30 line item on my card and not miss it. Here's what I found after running both through the same real tasks.

What Actually Shipped This Summer

This wasn't one announcement — it was a rollout, app by app, over about five weeks. PowerPoint got Grok on June 16, 2026. Word followed on June 18. Excel landed around June 20-22, then got a fuller release on July 20 running on the newly launched Grok 4.5 model. Outlook was last, shipping July 21. Three days after that, on July 24, xAI announced a matching Google Workspace add-on covering Docs, Sheets, and Slides through a single Marketplace install. In just over a month, Grok went from "chatbot on a website" to sitting inside every document editor most office workers touch daily.

Timing matters here, and it's not flattering for Microsoft. On April 15, 2026, Microsoft pulled free Copilot Chat out of Word, Excel, PowerPoint, and OneNote for business users — a feature that had only been available inside the apps for about six months. Enterprise customers (300+ seats) lost it entirely; smaller businesses got downgraded to a rate-limited "standard access" tier. The stated reason, per Microsoft's own reporting, was that only around 3% of Microsoft 365 customers were converting to paid Copilot anyway, so the free trial wasn't earning its keep. Three months later, xAI filled exactly that gap with something free-to-install in the same apps. The sequencing looks less like coincidence and more like xAI reading Microsoft's own adoption numbers and building the response.

What $30 a Month Actually Buys You in Copilot

Let's be precise about the number, because "Copilot costs $30" undersells how tiered this actually is. Microsoft 365 Copilot runs $30 per user per month for larger enterprises, and $21 per user per month for organizations with 300 or fewer employees. That's on top of whatever Microsoft 365 tier you're already paying for — it's not a replacement plan, it's an add-on. For a 50-person company, that's roughly $1,050 a month just for the AI layer, before you've touched your base M365 licensing.

What you get for that: Copilot is genuinely native. It sees your entire Microsoft Graph — SharePoint, Teams chats, Outlook history, OneDrive files — with enterprise-grade governance, admin controls, and compliance boundaries that Microsoft has spent two years building out. Satya Nadella said on the April 2026 earnings call that weekly Copilot engagement now matches Outlook's own usage levels, and Microsoft's biggest single deployment, Accenture, runs over 740,000 seats. That's real, deep usage at the top of the market — Bayer, Johnson & Johnson, Mercedes, and Roche each run 90,000+ seats of their own.

But the conversion story underneath that is rougher than the headline deals suggest. Microsoft reported more than 450 million paid commercial Microsoft 365 seats as of its January 28, 2026 earnings call — and only 15 million of those were paying for Copilot, about 3.3%. By the April 29 call, that had grown to 20 million paid seats, which is genuinely fast growth, but even generously counting 477 million total M365 seats, that's still only around 4.2-4.4% conversion. Translation: 19 out of 20 people paying for Microsoft 365 are choosing not to add Copilot at $21-30/month, even after six months of a free trial inside the apps.

What "Free" Actually Means in Grok's Office Add-Ins

Here's where I have to push back on the "Grok is free" framing you'll see everywhere, because it's not quite accurate and it matters for anyone actually budgeting this. The Word, Excel, and PowerPoint add-ins are free to install from the Microsoft Marketplace — that part is true, and it takes about two minutes. But the Microsoft Marketplace listing itself states that full usage is "currently for paid X and SuperGrok users, and usage limits apply." Grok for Outlook is explicit about this too: it's available to paid X and SuperGrok subscribers, full stop, no separate fee beyond that.

So the real comparison isn't "$30 vs. $0." It's $30/month for Copilot against a genuinely useful free tier (roughly 10 requests every 2 hours on the lighter Grok 4 Mini model), an $8/month X Premium tier, a $10/month SuperGrok Lite tier, or the full $30/month SuperGrok plan for unrestricted Grok 4.5 access with DeepSearch and a 128K context window. If you already pay for X Premium for other reasons, the Office add-ins genuinely are free on the margin. If you don't, you're comparing two $30 subscriptions, not "paid vs. free" — Grok's is just newer, buzzier, and currently cheaper to get real functionality out of at the $8-10 tiers.

Plan	Price	What you actually get in Office/Workspace
Microsoft 365 Copilot	$21-30/user/month	Full Graph access (email, Teams, SharePoint), enterprise admin controls, native across all apps
Grok free tier	$0	~10 requests/2 hrs on Grok 4 Mini inside the add-ins — fine for occasional use
X Premium	$8/month	More Grok queries, but not full Grok 4/4.5 or DeepSearch
SuperGrok	$30/month ($25/mo annual)	Full Grok 4.5 in Word/Excel/PPT/Outlook/Workspace, DeepSearch, 128K context

I Ran the Same Three Office Tasks Through Both

Numbers are one thing; actually using the tools is another. I picked three tasks that cover most of what people actually open these apps for: drafting a one-page project memo in Word, cleaning up a messy expense spreadsheet in Excel, and building a slide outline from a rough bullet list in PowerPoint. I ran each through Copilot (on my existing $30 subscription) and through Grok 4.5 in the free add-in.

• Word memo: Both produced a usable first draft from a short prompt. Copilot's version leaned more corporate-template by default; Grok's read a little more conversational, which I actually preferred, but it required a follow-up prompt to tighten formatting that Copilot got right on the first pass.
• Excel cleanup: This is where the gap showed. Grok read the selected range, cited the exact cells behind its suggested fixes, wrote working formulas for the flagged duplicates, and rebuilt a summary chart without me leaving the sidebar. Copilot's Excel skills have long been the weakest of its app integrations — inconsistent formula suggestions and occasional miscalculated totals are a recurring complaint I've seen echoed by other reviewers, and my test run wasn't an exception.
• PowerPoint outline: Both generated a reasonable slide structure from bullets. Grok's output pulled in a bit of live web context I hadn't asked for (a side effect of DeepSearch being on by default), which was sometimes useful and sometimes just noise I had to strip out.

My honest read: for drafting and slide outlines, they're close enough that brand loyalty or whichever one is already open wins. For spreadsheet work specifically, Grok's cell-citation habit and formula accuracy edged out Copilot in my test, which lines up with the general reputation Copilot in Excel has had since launch.

Nobody Is Quiet About This Online

The Grok rollout landed right as Copilot's fragmentation was already becoming a running joke. On a widely shared r/technology thread about Copilot's rocky reception, one commenter listed out the sprawl of Copilot variants they'd encountered at work:

"teams copilot, outlook copilot, browser web copilot, browser work copilot, power automate copilot, power copilot, search bar copilot" — r/technology

That's the actual friction Grok's arrival is exploiting — not that Copilot is incapable, but that it's become five different products wearing one name, each with its own quirks. On the Grok side, the announcements have been characteristically blunt. When Grok for Excel shipped, Elon Musk's post on it was three words:

"Grok for Excel is now live" — @elonmusk on X

No feature list, no pricing caveat about the SuperGrok requirement — which is exactly the kind of framing gap that's letting "free" stick in headlines even though the fine print says otherwise. IT admins have been quicker to catch that. Coverage of the rollout has repeatedly flagged that the add-in's own Marketplace disclosure admits it "can read and make changes to the current document" and "can send data over the internet" — reasonable behavior for an AI assistant, but worth a real security review before anyone points it at sensitive files, the same way you'd vet any third-party add-in.

So Is $30/Month Still Worth It?

Here's the buyer's question underneath all of this, and it's not really "Copilot or Grok." It's whether you want a single vendor's bundled assistant tied to one company's model roadmap and pricing decisions, or a subscription that gives you access to multiple model families — including the ones currently disrupting the market — in whatever tool you're already using.

If you're deep in the Microsoft ecosystem, need Teams and SharePoint context, and your org has already budgeted the $21-30/seat, Copilot's native integration is hard to fully replace — that's exactly why 20 million seats now pay for it despite the low overall conversion rate. But if you're a freelancer, small team, or just tired of watching your AI tools' pricing and access rules change every quarter (which is exactly what happened to Copilot Chat in April and is already baked into Grok's Office add-ins with the SuperGrok requirement), the calculation looks different. That's really the case for not marrying yourself to one vendor's app: models and pricing keep shifting under you either way, so the subscription that adapts is worth more than the one that doesn't.

That's the gap Writingmate is built to close. Instead of betting on one company's assistant, a Writingmate plan gets you Grok 4.5 itself alongside GPT, Claude, Gemini, and dozens of other models in the same chat window — including the exact model now sitting inside Word and Excel for free-with-conditions. You can check the full lineup on the models page, see what a plan costs on pricing, or just open the chat and run the same memo-draft or spreadsheet-cleanup prompt I used above with whichever model actually gets it right. You're not locked into Copilot's roadmap or Grok's SuperGrok gate — you just switch models when one of them ships something better, which given the pace of the last six weeks, is going to keep happening.

The Bottom Line

Copilot isn't a bad product — the engagement numbers from Microsoft's biggest customers prove it earns its keep at scale. But a 4.4% conversion rate on 450 million seats tells you almost everyone paying for Microsoft 365 has already decided $21-30/month isn't an easy yes, and Grok's arrival gives them a genuinely capable reason to keep saying no, even if "free" comes with a SuperGrok asterisk most headlines are skipping. If you're not already deep in Microsoft's governance and Graph ecosystem, I'd hold off on adding Copilot and instead spend a week testing whichever model actually solves your specific task — spreadsheet, memo, or deck — before committing to any single vendor's $30 line item.

See you in the next one!

Artem