

Grammarly and Surfer SEO are both AI Writing Tools tools. Grammarly starts at $30/mo, Surfer SEO at $59/mo. Compare features, pricing, and ratings below to find the best fit for your team.
The question that matters: “In what situation will I regret choosing A over B after 3 months?”
Tone suggestions catch aggressive or casual phrasing in the Browser extension, keeping outbound emails on-voice without review cycles that eat 4+ hours daily.
Plagiarism detection scans 16+ billion sources in under 3 seconds per document, catching unattributed language before it reaches external stakeholders.
Style improvements catch passive voice and unclear modifiers in spec documents, cutting engineering scope clarification requests by 35% and compressing feedback loops.
The Team style guide pushes real-time corrections into Google Docs, team chat, and email clients - cutting first-pass copy editing for 60-70% of contributor submissions.
SERP Analyzer pulls competitor word counts, headings, and entity mentions - feeding those signals into the AI writing tool so ranking gaps close in one draft.
Topical authority maps surface keyword clusters; the content planner assigns publication order and links - building a hub that ranks for 40+ related queries.
NLP analysis flags missing semantic keywords and structural gaps, letting publishers batch-update legacy posts with targeted additions instead of full rewrites.
Best for: Write without spelling and grammar mistakes
Best for: Most Popular, achieve goals with clear and confident writing
Best for: Drive results across org, available through Superhuman Go
Best for: Draft and optimize content to establish baseline presence in Google and AI search results
Best for: Align team with unified workflow, grow visibility in AI search
Best for: Secure authority, fix technical conflicts, manage AI perception at scale
Best for: Custom scale and security
15 differences found across 31 standardized features
Evaluative strengths and weaknesses: not feature lists
Surfer SEO added the "Discovery" plan at $59/mo
Plan added · Jun 28, 2026
Surfer SEO added the "Standard" plan at $107/mo
Plan added · Jun 28, 2026
Surfer SEO added the "Pro" plan at $197/mo
Plan added · Jun 28, 2026
Surfer SEO added the "Peace of Mind" plan at $323/mo
Plan added · Jun 28, 2026
Surfer SEO removed the "Essential" plan
Plan removed · Jun 28, 2026
Grammarly removed the "Business" plan
Plan removed · Jun 3, 2026
Grammarly removed the "Premium" plan
Plan removed · May 30, 2026
Grammarly updated "Business" from $15/mo to Custom
Price change · May 30, 2026
Grammarly added a new "Pro" plan at $30/user/mo
Plan added · May 30, 2026
Grammarly removed the "Pro" plan
Plan removed · May 21, 2026