Best AI SEO Blog Writer: Six Tools Priced by the Post That Goes Live

The best AI SEO blog writer depends on what you need done after the words are written. For the most posts per dollar, BlogSEO: its Advanced plan is $0.99 an article at 100 a month. For a cheap start that publishes to Shopify and Webflow too, Koala from $25. For writing with optimization scoring, Frase. For 30 published posts on one site, The SEO Agent. And for fewer posts that are researched from your own site data, published, linked in and backed by fixes to the rest of the site, an AI SEO agent such as Rankable.

Most "best AI writer" lists rank tools by how good a paragraph sounds. That was a fair test two years ago. Today every serious tool writes a readable post; the differences that cost you money are whether the post goes live without you, whether it targets a query your site can win, and whether anything links to it. So the list below is priced by the post that ends up live on your site, with each price read from the vendor's own pricing page in September 2026.

The best AI SEO blog writers, compared

Arvow is worth a look too if you like credit-based plans: Solo is $69 a month, or less billed yearly, for 1,000 credits on one website. We left it out of the table because credits do not convert cleanly to a post count.

What is the best AI SEO blog writer?

For most businesses that already have a working site, the best AI SEO blog writer is one that publishes to your CMS, picks topics your site can realistically rank for, and links each new post into pages Google already crawls. A tool that only produces text in its own editor moves the bottleneck from writing to formatting and uploading, which is where most blog calendars stall. If you publish more than 20 posts a month and your site is technically clean, the cheapest per-post tool wins. If you publish fewer and your site has weak titles, missing meta descriptions and orphan pages, fixing those first will do more than any extra post.

BlogSEO: the most posts for the money

BlogSEO sells volume. Basic is $39 a month for 25 articles, which works out to $1.56 each, and publishes to Notion. Advanced is $99 for 100 articles and adds WordPress, Webflow and Ghost publishing plus a second user. A 50 percent promo was running when we checked, so the price you pay may be lower than list. Pick it if you run several content sites or need a large archive quickly. The risk is the obvious one: 100 posts a month on a small site can look like the scaled content Google's spam policies describe, so volume only pays when each post has a real query behind it.

Koala: the cheapest way to start

Koala meters by words rather than articles. Starter at $25 a month gives you 45,000 words, enough for roughly 15 to 20 long posts, and it publishes to WordPress, Shopify, Webflow and Ghost, with webhooks and an API. That Shopify support matters: most AI SEO agents, ours included, do not publish to Shopify. Professional adds an MCP server so you can drive it from an AI assistant.

Frase: writing with optimization scoring

Frase is the pick for a writer or editor who wants to see how a draft scores against the pages already ranking and tune it before publishing. Starter includes 10 articles on one site, which puts each at $4.90, and Professional at $129 includes 40 articles across five sites. It publishes to WordPress, Webflow, Sanity and Wix.

Writesonic: posts plus AI visibility tracking

Writesonic's headline product is now tracking how ChatGPT, Gemini and Google's AI answers mention your brand, with an article writer alongside. Starter is $79 a month billed yearly for 15 articles. Buy it if the tracking is the main thing you want and the articles are a bonus.

The SEO Agent: published volume on one site

The SEO Agent is $99 a month for 30 articles on one site, which is $3.30 a post, and it publishes them for you. If your whole plan is "more posts, live, every week" on a single blog, it is hard to beat on price.

Rankable: posts backed by a site that can rank them

Rankable is an AI SEO agent rather than a blog writer, and it is the most expensive option here per post: $24.75 on Starter, which is $99 a month for 4 researched articles. The rest of the plan is what the others do not do. Every week it audits the site, applies up to 60 fixes to titles, meta descriptions, internal links, schema, image alt text and the sitemap, picks article topics from the gaps in your own audit and Search Console data, publishes the posts and links them into related pages. Every change is logged and can be undone in one click. It does not track rankings, it does not run a backlink index, and it publishes to WordPress and to sites served over SFTP only. The full price comparison is on our SEO blog writer page.

Which AI writer is best for SEO blog posts?

Match the tool to the job you are short on. Short on volume: BlogSEO or The SEO Agent. Short on budget: Koala. Short on editing quality: Frase, with a person reviewing. Short on time to run SEO at all: an agent that publishes and fixes, which is what our AI blog writer is part of. Most small teams are short on time, which is why a cheap writer so often ends in a folder of unpublished drafts.

Is AI-written blog content good for SEO?

It can be. Google's published guidance says it rewards helpful, original content however it is made, and that using automation mainly to produce pages that manipulate rankings breaks its spam policies. In practice that means AI posts rank when they answer a query people search, add something the current results lack, and are linked from pages Google already trusts. It also means the number of posts a plan allows is a weak reason to buy it. Our breakdown of how many blog posts per month you need for SEO puts four researched posts a month ahead of forty thin ones for most small sites.

How much does an AI SEO blog writer cost?

List prices run from $25 a month (Koala Starter) to $129 (Frase Professional) for the plans most businesses buy, with BlogSEO at $39, Writesonic at $79 billed yearly and The SEO Agent at $99. Per published post the range is $0.99 to $4.90 for the writer tools. Rankable Starter works out to $24.75 a post because the same $99 also pays for the weekly audit and up to 60 site fixes. Growth at $249 covers three sites and 12 articles a month.

What to check before you pay

Three questions settle most choices. Does it publish to your CMS, or will someone paste and format every post? Does it pick topics from your own data, or only from the keyword you type? And does anything link the new post into the rest of your site? It also helps to know what the sites you compete with are putting out each week; a competitor monitoring tool will flag new pages on their blogs so your topic list is not built blind. If your site runs on WordPress, our guide to publishing blog posts automatically to WordPress covers the connection step.

The short version

Buy BlogSEO or The SEO Agent for volume, Koala for the cheapest start or a Shopify store, Frase for editing with scores, and Writesonic if AI visibility tracking is the real goal. Buy Rankable when you want fewer posts that are researched from your own site, published, linked in and backed by a site that has been fixed to rank them. Every Rankable account starts with a free site audit and action plan, so you can see the topics and fixes before you pay.