Two of the most-used AI SEO tools, pulled apart on price, quality and who each one is actually built for. We tested both so you can skip the trial-and-error.
Want genuinely useful free tier? Grammarly starts at $12/mo. Want best-in-class on-page optimization? Surfer SEO starts at $79/mo — Grammarly is the cheaper entry.
AI writing assistant for grammar, clarity, tone and rewriting
On-page content optimization tool that reverse-engineers top rankings
Disclosure: affiliate links. We may earn a commission at no extra cost to you. It never changes our verdict.
Grammarly and Surfer SEO meter usage differently — subscription (per user) vs subscription + Surfer AI add-on. So the "cheaper" answer depends entirely on how much you produce.
| Plan | Grammarly | Surfer SEO |
|---|---|---|
| Free tier | Yes — Basic grammar, spelling, tone across browser/apps | No |
| Entry paid | $12 Pro (was Premium) | $79 Essential |
| Creator sweet spot | $12 Pro (was Premium) — $12/mo annual ($30 monthly); rewriting, plagiarism, AI detection, tone | $79 Essential — $79/mo annual ($99 monthly); 30 content credits, 1 seat |
| Billing model | subscription (per user) | subscription + Surfer AI add-on |
Pricing verified May 2026 — always confirm current rates on the official site.
Anyone writing regularly who wants clarity and tone fixed before publishing.
Bloggers and SEO pros publishing 4+ optimized articles per month.
Grammarly starts cheaper at $12/mo versus $79/mo for Surfer SEO. But the billing models differ (subscription (per user) vs subscription + Surfer AI add-on), so "cheaper" depends on your usage volume.
Grammarly is built for anyone writing regularly who wants clarity and tone fixed before publishing. Surfer SEO is built for bloggers and seo pros publishing 4+ optimized articles per month. Pick based on the workflow that matches yours, not the price tag.
Free tiers typically block commercial use; the paid plans unlock commercial rights. Grammarly has a free tier; Surfer SEO doesn't either.