Grok vs Grammarly
Plans, free access, limits and intended use side by side, taken from each vendor’s own pages. No score and no winner: the facts show where the two differ.
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Real-time grammar, tone and AI writing help inside the apps where you already type.
- Free access
- Grok: Free access
- Grammarly: Free access
- Paid from
- Grok: USD 10 per month
- Grammarly: USD 12 per member per month
- Plans listed
- Grok: 6
- Grammarly: 3
- Public API
- Grok: Yes
- Grammarly: Not confirmed
Where Grok and Grammarly differ
- PlansGrok lists 6 plans and Grammarly lists 3.
Head to head
Each value from the tool’s profile and the vendor’s own pages
| Grok | Fact | Grammarly |
|---|---|---|
| Access and price | ||
| Free access availableFree · USD 0 | Free accessSame | Free access availableFree · USD 0 |
| USD 10 per monthSuperGrok Lite · shown on the grok.com plans page | Lowest listed paid plan | USD 12 per member per monthPro · billed yearly · USD 30 billed monthly |
| Free plan; SuperGrok from $30/month | Pricing model | Free plan; Pro from USD 12; Enterprise custom |
| 6 | Plans listedDiffers | 3 |
| Yes | Public API | Not confirmed |
| Not confirmed | Card to start | Not confirmed |
| No | Open source | Not confirmed |
| What it is for | ||
| Chat and research that needs live X and web context | Built for | Correcting and polishing everyday writing |
| Writing & content | CategorySame | Writing & content |
| Platforms |
|
| Works with |
|
| How current | ||
| Profile sources checked | ||
| Prices confirmed · Sep 29, 2026 | Pricing checkSame | Prices confirmed · Sep 26, 2026 |
Official source check for both tools. No hands-on testing and no score: “Differs” marks a documented difference, not a better tool.
Plans and prices
Grok
Prices confirmed · Sep 29, 2026- FreeUSD 0
- SuperGrok LiteUSD 10 per monthshown on the grok.com plans page
- SuperGrokUSD 30 per month
- SuperGrok PlusUSD 100 per month
- SuperGrok HeavyUSD 300 per monthshown on the grok.com plans page
Show 1 more plan
- BusinessUSD 30 per month as listedseat basis not stated
Grammarly
Prices confirmed · Sep 26, 2026- FreeUSD 0EUR 0 shown
- ProUSD 12 per member per monthbilled yearly · USD 30 billed monthly
- EnterpriseContact provider
Strengths and limits
Grok
Strengths
- Capable free tier: Free includes Grok 4.6, image generation, voice mode, Grok Build and connectors without a subscription.
- Live X context: Real-time X search surfaces current public posts that general chat assistants may not reach.
- Same core model on every tier: All consumer tiers list Grok 4.6, so upgrades buy limits and features rather than a different core model.
Limits to plan around
- Tier prices split across two pages: x.ai/pricing omits Lite and Heavy, which appear only on the grok.com plans page.
- Broad license over inputs: The terms grant SpaceXAI a perpetual, sublicensable license to inputs, including any image, likeness or voice they contain.
- No-training promise only for business: The comparison table reserves its no-training commitment for Business and Enterprise; consumers rely on a settings opt-out.
Grammarly
Strengths
- Works where you already write: The same suggestions run in browser extensions, desktop apps, Office and Google Docs add-ins and mobile keyboards.
- Usable free tier: Free has no time limit and includes spelling, grammar, tone detection and a monthly prompt allowance.
- Flexible Pro billing: Pro can be paid monthly, quarterly or yearly per member, and a team account can grow to 149 seats.
Limits to plan around
- Refunds only where law requires: You can cancel at any time, but paid time is refunded only when local law requires it.
- Review agents are paid: Plagiarism Checker, AI Detector and Citation Finder need Pro, and Free gets a single AI Grader scan a day.
- Own rewrites can trip the detector: Text rewritten by Grammarly's agents is likely to be flagged by its AI Detector.
See both products
Start from your task, not from a winner.
Run both tools on the same real task, then compare the result, how much editing it needs and how fast it uses your plan’s allowance.
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Comparing tools from different categories is fine, and often useful — a writing assistant and a research tool solve different halves of the same job. The table will show you exactly where they diverge.
Questions about comparing tools
How does the comparison work?
Add two tools to the comparison tray from any tool card, then open this page. The table pulls each tool's verified plan details, platforms, strengths and limits from its profile, so both columns carry the same kind of evidence, with a separate source-check date for each tool.
Do you declare a winner?
No. The table sets two tools against each other on documented facts, not on a score. Which one wins depends on your task, your budget and your usage volume — three things we cannot see from here.
Why are some cells empty or marked unverified?
Because we could not confirm that detail on the vendor's own pages. Rather than filling the gap with a figure from elsewhere, we mark it and say why on the tool's profile.
Can I compare more than two tools?
Not at once. Two columns keep the differences readable and force a real decision. Remove either selected tool to replace it, or clear both to start a new pair.
Every figure in the table above comes from the linked profile, where the source and the verification date are listed. Browse all tools or read the editorial policy.