Best AI tools to write SEO blog articles

Short answer

Surfer ranks #1 for write SEO blog articles (score 8.4/10). Pricing: Standard $99/mo; free tier: no. Runners-up: Frase, Claude.

Top 5, ranked by our published rubric. Sponsorship never affects the order. Last updated 2026-10-13.

Compare the top 5 side by side

#	Tool	Score	Pricing	Paid from	Free tier	What it is
1	Surfer	8.4	From $99	Standard $99/mo	no	SEO content optimization
2	Frase	8.3	Free tier	From $39/month as listed (billed annually)	yes	SEO content research and writing
3	Claude	6.7	Free tier	$17/mo billed annually ($20 monthly)	yes	General AI assistant by Anthropic
4	Writesonic	6.5	From $79	From $79/month as listed	Unverified	AI SEO and content platform
5	Clearscope	6.2	From $129	$129/mo	no	SEO content optimization

Rank 1

Surfer

From $99Visit Surfer (opens in a new tab)

SEO content optimization

Score 8.4/10Paid from: Standard $99/moFree tier: noLast verified 2026-10-13

Why ranked: Its own site says: “Track and improve your brand's visibility across Google and AI search engines like ChatGPT, Gemini, and Perplexity.” We placed it 1st of 5 on fit for this task. No free plan confirmed; paid from Standard $99/mo.

Fit 10.0 · value 3.8 · breadth 10 · availability 10 (how we score) · pricing source · site live

Rank 2

Frase

Free tierVisit Frase (opens in a new tab)

SEO content research and writing

Score 8.3/10Paid from: From $39/month as listed (billed annually)Free tier: yesLast verified 2026-10-13

Why ranked: Its own site says: “The content operating system for AI search.” We placed it 2nd of 5 on fit for this task. Free tier; paid from From $39/month as listed (billed annually).

Fit 8.5 · value 8.8 · breadth 6 · availability 10 (how we score) · pricing source · site live

Rank 3

Claude

Free tierVisit Claude (opens in a new tab)

General AI assistant by Anthropic

Score 6.7/10Paid from: $17/mo billed annually ($20 monthly)Free tier: yesLast verified 2026-10-13

Why ranked: Its own site says: “No commitment · Cancel anytime Everything in Free, plus: More usage Hand off tasks and get back finished docs, slides, sheets, and designs Claude Code Claude Science Projects More Claude models Claude in Chrome and Microsoft 365 Max ” We placed it 5th of 5 on fit for this task. Free tier; paid from $17/mo billed annually ($20 monthly).

Fit 4.0 · value 10.0 · breadth 10 · availability 7 (how we score) · pricing source · site bot-blocked (403)

SPONSORED Your tool here: paid placement is shown here, separate from the ranking, and never changes the order. Advertise

Rank 4

Writesonic

From $79Visit Writesonic (opens in a new tab)

AI SEO and content platform

Score 6.5/10Paid from: From $79/month as listedFree tier: UnverifiedLast verified 2026-10-13

Why ranked: Its own site says: “The AI Search Growth Engine. GEO, AEO, and AI visibility in one platform.” We placed it 3rd of 5 on fit for this task. No free plan confirmed; paid from From $79/month as listed.

Fit 7.0 · value 4.4 · breadth 6 · availability 10 (how we score) · pricing source · site live

Rank 5

Clearscope

From $129Visit Clearscope (opens in a new tab)

SEO content optimization

Score 6.2/10Paid from: $129/moFree tier: noLast verified 2026-10-13

Why ranked: Its own site says: “Clearscope is the discoverability platform for a new era in search.” We placed it 4th of 5 on fit for this task. No free plan confirmed; paid from $129/mo.

Fit 5.5 · value 3.8 · breadth 10 · availability 10 (how we score) · pricing source · site live

FAQ

What is the best AI tool to write SEO blog articles?

By TaskRanking's published rubric, Surfer ranks first, followed by Frase and Claude.

Is there a free AI tool to write SEO blog articles?

Yes: Frase has a free tier per its own pricing page (checked 2026-10-13).

How are these tools ranked?

Score = 50% fit, 25% value (from vendor pricing pages), 15% breadth, 10% availability. Sponsorship never affects rank.