Best AI Agent for SEO Content Creation: 5 Agents Compared on Price and What They Publish
Published September 15, 2026 by the Rankable team
Put your website SEO on autopilot
Rankable can research and write posts like this one for your own site, on autopilot.
See pricing starting at $99/mo
Short answer: the best AI agent for SEO content creation depends on where your content stalls. If drafts pile up unpublished, buy an agent that publishes and fixes the site around the article: Rankable ($99 a month for one website, 4 articles published, up to 60 SEO changes applied) or SearchAtlas OTTO ($99 a month, $79 billed annually). If you have an editor and want the cheapest drafts, Frase ($49 for 10) and SE Ranking's built-in writer ($129 for 25) cost a fraction per article. Writesonic ($79 a month billed annually for 15 articles) is now sold primarily as an AI visibility tracker with articles attached.
Every price below was read from the vendor's own pricing page on 16 September 2026, except Frase, which was re-read on 10 September. Where a vendor publishes an article allowance, the cost per article is that price divided by that allowance, so you can check the arithmetic.
What "AI agent" means on a pricing page in 2026
Three different products now share the label. The first is a writing agent: give it a keyword and it researches, outlines and drafts. Frase and SE Ranking's AI Writer are this. The second is a workflow agent with a run budget: Writesonic sells "agentic workflows" as limited trial runs, 10 on Starter, 50 on Basic, 100 on Growth, alongside a fixed article allowance. The third is an autonomous agent that treats the article as one step in running the site's SEO: it audits, changes titles and internal links on the live site, writes the article, publishes it, adds it to the sitemap and reports. Rankable and SearchAtlas OTTO are this third kind.
The distinction matters because a draft is not traffic. Most content backlogs are not short of drafts; they are short of someone who publishes, links and fixes the technical debt that keeps the published page from ranking. Price the category you actually need.
The five agents, priced
| Agent | Monthly price | Articles a month | Cost per article | Publishes to your site? |
|---|---|---|---|---|
| Rankable Starter | $99 ($49.50 billed yearly) | 4, plus 60 SEO changes applied | $24.75 | Yes, written and published, sitemap submitted |
| Rankable Growth | $249 ($124.50 yearly) | 12 across 3 websites, daily runs | $20.75 | Yes |
| Rankable Agency | $599 ($299.50 yearly) | 40 across 15 websites, API | $14.98 | Yes |
| Writesonic Starter | $79 billed annually | 15, 1 user, 10 agentic runs | $5.27 | WordPress integration listed; publishing not stated |
| Writesonic Basic | $199 billed annually | 25, 2 users, 50 agentic runs | $7.96 | Same |
| SearchAtlas Starter (OTTO) | $99 ($79 billed annually) | Credit based, 50,000 monthly credits | Not published per article | Yes, OTTO applies fixes and content |
| SearchAtlas Growth | $199 ($159 annually) | 120,000 credits, 3 seats | Not published per article | Yes |
| Frase Starter | $49 | 10 articles, 1 site | $4.90 | Ships an agent that posts to WordPress, Webflow, Sanity, Wix |
| Frase Professional | $129 | 40 articles, 5 sites | $3.23 | Same |
| SE Ranking Core | $129 (US price) | 25 AI Writer articles, plus rank tracking | $5.16 | No, drafts inside the platform |
Two things the table cannot show. Writesonic's annual figures carry a "save $240 a year" label on Starter, which puts the monthly-billed price $20 higher; the same pattern applies up the ladder. And SearchAtlas meters everything through a universal credit pool, so the number of articles a month depends on what else OTTO spends credits on for the same site.
Rankable: the article is one step, the site is the job
Rankable is built for the case where nobody on the team has time to act on SEO reports. You enter the website, connect access and switch on autopilot. Every week on Starter, and every day on Growth and Agency, the agent audits the site against a 147-point technical checklist, applies the fixes it is allowed to make (titles, descriptions, internal links, orphan pages), researches the queries the site does not yet cover, writes the article in the site's own layout or as a WordPress post, publishes it, adds it to the sitemap, submits the sitemap to Google and sends a report. Every change is logged and can be undone in one click.
That is why its per-article number is the highest in the table. $24.75 buys an article that is live and indexed, plus up to 60 other changes on the same site in the same month. If you would pay a freelancer to write and then pay someone else to upload, link and fix, the comparison is with that whole bill. If you only need drafts, it is the wrong purchase, and the AI SEO pricing table makes that plain. There is no free trial; every account gets a free site audit that shows the exact plan of changes before you pay. Starter is $99 a month for one website of up to 500 pages, Growth is $249 for three, Agency is $599 for fifteen with API access, and yearly billing halves each of those.
What Rankable does not do: it does not track rankings daily, it does not monitor whether ChatGPT or Perplexity mention your brand, and it does not run a backlink index or a keyword database. Several tools in this table now sell AI visibility tracking as their headline, and if that is what you are buying, they are the right tools.
Writesonic: articles attached to a visibility tracker
Writesonic's SEO AI Agent page ranks first for this query, and its pricing page tells you what the product has become. Starter at $79 a month billed annually leads with "Track your brand across ChatGPT, Gemini, and Google AI Overviews" and includes 15 AI articles and 10 site audits of 100 pages each. Basic at $199 adds 25 articles, 2 users and 100 tracked prompts; Growth at $399 adds 50 articles, 3 seats and the Action Center. The agentic workflows that justify the "agent" label are capped at 10, 50 and 100 runs respectively.
Per article that is $5.27 on Starter and $7.96 on Basic, which is good value for drafts if the visibility tracking is something you want anyway. The pricing page lists a WordPress integration but does not state that articles are published automatically, so ask before you assume the draft leaves the dashboard.
SearchAtlas OTTO: the closest like-for-like alternative
OTTO is the other agent in this list that touches the live site. SearchAtlas describes it as running "technical fixes, on-page improvements, and content" on its own, and the plans are Starter at $99 a month ($79 billed annually, $950 a year), Growth at $199 ($159, $1,910 a year), Pro at $399 ($319, $3,828 a year) and Agency from $999. Seats run 1, 3, 5 and 10. There is a 7-day trial on Growth, and every plan is metered in universal credits rather than articles.
The honest comparison with Rankable is scope against simplicity. SearchAtlas is a full suite (rank tracking, backlink analysis, local citations, ads tooling, an LLM visibility module) with OTTO on top, and the credit pool is shared across all of it. Rankable is a single agent with a fixed allowance of changes and articles per website, and a report. If you want one bill that covers research data and the agent, SearchAtlas is the better fit. If you want a flat, predictable allowance of work per site, Rankable is.
Frase and SE Ranking: the cheapest drafts
Frase is the cheapest way to get a finished draft in this comparison: Frase Starter is $49 a month for 10 articles and one site, Professional $129 for 40 across five sites, Scale $299 for 100. It sells extra articles at $5 and $4 each above the cap, and it ships an agent that posts to WordPress, Webflow, Sanity and Wix. What it does not do is touch the rest of the site; if a title tag is wrong or a page is orphaned, Frase will not know.
SE Ranking is a rank tracker and audit platform that happens to include an AI Writer, and its US price list (the page shows EUR to European visitors) puts 25 articles a month inside the $129 Core plan and 50 inside Growth at $279. That is $5.16 and $5.58 a draft, bundled with 2,000 tracked keywords a day and a 250,000-page audit allowance. Nothing is published for you. Full plan details are on SE Ranking pricing.
Which AI agent is best for SEO content creation?
For a small business or a single site with no marketer, the best AI agent for SEO content creation is one that publishes and fixes, because unpublished drafts are the failure mode. That is Rankable Starter at $99 or SearchAtlas Starter at $99. For an agency that already has an editor and wants volume, Frase Professional at $129 for 40 articles across 5 sites is the best price per draft, and Rankable Agency at $599 for 15 websites is the best price per site that is actually run. For a brand whose main worry is AI visibility rather than content, Writesonic Basic at $199 bundles the tracking with 25 articles.
Should I build an SEO agent instead of buying one?
Two of the pages ranking for this query are build-your-own guides, so the question is real. Building is sensible when your workflow is unusual, for example a headless CMS with an approval chain or content in six languages, and you have an engineer who will own the agent after launch. If that describes you but the engineer does not exist, it is cheaper to hire an AI developer to build and maintain the agent than to pay a marketer to babysit a chain of no-code tools. For a standard website, buying is faster: every agent above is live in an afternoon, and Rankable's free site audit shows the plan of changes before you commit.
How much does an AI SEO content agent cost per month?
Between Frase's $49 and Rankable's $599 a month at the self-serve tiers compared here. Draft-only tools sit at the bottom (Frase at $49, Writesonic at $79 billed annually). Agents that publish and change the live site start at $99 (Rankable, SearchAtlas) and run to $599 for fifteen websites. Per article the spread is $3.23 to $24.75, and the higher number buys publishing and site fixes, not just text. Compare per article only after you have decided whether you need the article published.
The short version
- Drafts pile up unpublished: Rankable Starter, $99, 4 articles published plus 60 fixes a month.
- You want a full SEO suite with an agent on top: SearchAtlas Starter, $99 ($79 annually).
- You have an editor and want the cheapest drafts: Frase, $49 for 10 or $129 for 40.
- You need rank tracking anyway: SE Ranking Core, $129, with 25 drafts included.
- Your real worry is ChatGPT visibility: Writesonic, from $79 a month billed annually.
For the broader landscape of agents, including ones that do not write at all, see AI SEO agent, and for how the whole category prices its plans, see AI SEO pricing.