A founder in r/Agentic_SEO wrote up a painful experiment this year. A script wrote and published more than 140 AI articles over about two months, and Google indexed nine of them. The rest sat in Search Console as "crawled, currently not indexed", which is Google saying it read the page and chose not to keep it.
The second attempt on the same domain used the same model and almost the same prompts, and it worked. What changed was everything around the writing, from the context fed in to the internal links and the site structure. That's the most useful frame I've found for choosing an AI content writer, and I call it the blank-page test. What does the tool know before it writes the first word?
This list compares RankControl, Semrush Content Toolkit, Jasper, Surfer, Frase, Writesonic, Koala AI, Byword and SEOWriting.ai on that test, and on what one article costs. Every price below was read off the vendor's own pricing page or help docs on October 18, 2026.
The blank-page test, side by side
Here's each writer on the same columns. "Reads what ranks" means the tool looks at the current search results before it drafts, by its own description.
| Writer | Entry price (monthly) | Articles on that plan | About per article | Reads what ranks | Your brand voice | Publishes to your CMS |
|---|---|---|---|---|---|---|
| RankControl | $400 | Up to 100 | $4 | Yes | Built from your site | 9 destinations |
| Semrush Content Toolkit | $60 | 5 SEO-boosted, plus standard | $12 per boosted | Yes | Yes | WordPress |
| Jasper | $69 per seat | Not counted | Seat-based | Not its focus | Yes, the core feature | Through integrations |
| Surfer | $119 | 360 documents | Not counted | Yes, scores against it | Templates and custom voices on Pro | WordPress |
| Frase | $49 | 10 | $4.90 | Yes | Brand context | WordPress, Webflow, Sanity, Wix |
| Writesonic | $99 | 15 | $6.60 | Partly | Yes | Exports to several CMSs |
| Koala AI | $25 | 45,000 words | About $1 | Real-time data | Brand DNA | WordPress, Shopify, Webflow, Ghost |
| Byword | $99 | 25 | $3.96 | Yes | Yes | WordPress and webhooks |
| SEOWriting.ai | $19 | Up to 50 | $0.38 | Real-time SERP | 1 brand voice | WordPress, Shopify app |
Three verdicts come straight out of it. For teams that want the whole job done, from topic to published page, the best pick is RankControl, because it's the one writer here that plans the calendar and tracks the result as well. For teams already living in Semrush, the best pick is the Content Toolkit, since the keyword data is already there. For the lowest cost per article, the best pick is SEOWriting.ai, at well under a dollar.
You're getting AI traffic. But do you know where it comes from?
RankControl credits every visit to the assistant that sent it: ChatGPT, Perplexity, Claude, Gemini, Copilot, or Grok. Full source attribution, next to your Google traffic.
The 9 best AI content writers for SEO
1. RankControl
RankControl starts the blank page with more than a prompt. It finds the questions buyers in your market search, plans titles onto a calendar, and writes each article against the pages already ranking for its keyword, in a voice drawn from the brand profile it builds from your own site. Each article is scored for how easily AI engines can quote it, with a fix list.
The content engine then publishes to your CMS once you approve, across nine kinds of destination from WordPress to headless sites. It's $400 a month for up to 100 pages, which works out near $4 an article, and that price also covers weekly AI search tracking on six engines. There's a 7-day free trial.
2. Semrush Content Toolkit
Semrush's toolkit costs $60 a month with a 7-day trial, per its help docs. Standard articles are unlimited, while SEO-boosted articles, the ones built on Semrush's keyword and SERP analysis, are capped at five a month, with 10 more for $30.
It writes in your brand voice and publishes through WordPress. The five-boosted limit is the number to plan around, since those are the articles with the search data behind them. Our RankControl vs ContentShake comparison covers the trade-offs.
3. Jasper
Jasper is a marketing platform first and an SEO writer second. Pro costs $69 a month per seat, or $59 billed yearly, and includes two brand voices, five knowledge assets and three audiences, plus agents for common marketing work.
That makes Jasper strong at sounding like you and weak on the search side of the blank-page test, since it doesn't present reading the current results as part of drafting. You bring the keyword research. We list who else fits in our Jasper alternatives roundup.
4. Surfer
Surfer, now sold under the Positive brand, is built around a content editor that scores your draft against the pages ranking for the keyword. Standard costs $119 a month for 360 documents, and Pro at $219 adds templates, custom voices and one-click internal linking.
It passes the search half of the test better than anything else at this price. It's a tool for editing to a score, so the topic choice and the publishing are still on you. Our list of SEO content tools compares Surfer with the other optimizers job by job.
5. Frase
| Frase Starter | |
|---|---|
| Price | $49 a month, or $39 billed yearly |
| Articles | 10 a month |
| Publishes to | WordPress, Webflow, Sanity, Wix |
| Trial | 7 days, no card |
Frase researches the pages that rank, drafts, scores and publishes, and its agent can publish on its own once you allow it. Ten articles a month suits a team writing a couple of posts a week.
We'll show you exactly where your brand stands in AI search.
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6. Writesonic
Writesonic now leads with AI visibility tracking and keeps its writer alongside. Starter costs $99 a month, or $79 billed yearly, with 15 AI articles and 10 site audits included. That's about $6.60 an article if you only count the writing.
It makes sense for a team that wants daily tracking and a writer in one login, and less sense if writing is the main job.
7. Koala AI
Koala counts words instead of articles. Starter costs $25 a month for 45,000 words, roughly 20 articles of 2,000 words, and adds real-time factual data and publishing to WordPress, Shopify, Webflow and Ghost. It's popular with affiliate sites, and it pulls live Amazon data for product articles.
At about a dollar an article it's one of the cheapest serious options. See RankControl vs Koala AI for where the two differ.
8. Byword
Byword is built for volume. Starter costs $99 a month for 25 articles, about $3.96 each, with extra articles at $3.50, and Scale at $999 brings the price under $3.40 for 300 a month. It publishes through WordPress and webhooks, and every account starts with five free articles.
That shape fits programmatic runs, where you have a list of keywords and a template. Our RankControl vs Byword comparison covers the rest.
9. SEOWriting.ai
SEOWriting.ai is the price floor. Starter costs $19 a month for up to 50 articles, or about 38 cents each, with real-time SERP data, one brand voice and WordPress publishing. There's also a Shopify app.
Cheap articles are only cheap if they get indexed. Read the next section before you buy 50 a month.
What to give any AI writer before it starts
Whichever tool you pick, you can pass the blank-page test yourself by handing it five things before it drafts. Most of them take minutes to collect, and they're the difference between a page Google keeps and one it reads and drops.
- The top five results for the keyword, with a note on what each one leaves out. That gap is the reason your page should exist.
- Your own facts, meaning current prices, real numbers from your business and the date you checked them. When we ran 10 buyer questions through ChatGPT search in October, it added the current year to 8 of the searches and asked for official pricing in 5, so dated, specific facts are what AI answers go looking for.
- Two or three pages that sound like you, so the voice matches the rest of the site.
- The pages on your site this article should link to, and the ones that should link back to it.
- One named source the article can cite, like a study, a survey or a public document.
Our guide to LLM SEO strategies covers what else that ChatGPT run showed about the pages that get cited. If you publish to more than one site, check that your writer supports your CMS before you buy, since only a few here go beyond WordPress, and RankControl's publishing destinations list shows the nine it handles.
Why cheap articles stall
Google's guidance on AI-generated content says it rewards helpful content however it's produced. Its spam policies, on the other hand, name scaled content abuse, meaning many pages made mainly to rank. Most AI articles land between those two lines, and the r/Agentic_SEO founder above found out which side theirs fell on.
Replies in an r/WebsiteSEO thread asking whether AI content hurts rankings put it plainly. One reply's test was that if an AI can produce the article in 20 seconds, it's commodity content, and Google has no reason to keep a 50th copy of it.
Does AI-written content hurt SEO rankings?
If I write an article with AI, then edit it, fact-check it, and optimize it properly, can it still rank well? Would love to hear your real experiences, especially if you’ve tested this on your own websites.
So before choosing a writer, check what it adds that the top five results don't already say. A real number from your business, a named source, a process you actually run or a price you actually charge will do more for indexing than any amount of word count.
What publishing with AI really costs
The per-article price is the smallest number in the budget. Editing an AI draft properly, adding your own facts, images and links, takes about an hour or two per article. Publishing and linking it adds another half hour, and checking whether it ranks or gets cited in AI answers adds a few minutes a week per page.
For 20 articles a month, that's 30 to 50 hours of someone's time on top of the subscription, which is why the writer you pick matters less than what happens around it.
Which AI content writer fits your team
| If you... | The best pick is |
|---|---|
| Want articles planned, written and published | RankControl |
| Already pay for Semrush | Semrush Content Toolkit |
| Care most about brand voice across channels | Jasper |
| Edit drafts to a score | Surfer |
| Write a few articles a week yourselves | Frase |
| Want tracking and writing in one login | Writesonic |
| Run an affiliate or niche site | Koala AI |
| Run programmatic pages from a keyword list | Byword |
| Need the lowest price per article | SEOWriting.ai |
If your team drafts in ChatGPT, Claude or Gemini, our list of AI content creation tools for SEO teams compares those seat plans too.
The pick
If you have an editor and a strategy, a cheaper writer plus your own judgment goes a long way. Surfer or Frase will keep drafts close to what ranks, and SEOWriting.ai or Koala will keep the bill small.
If nobody has time to plan topics, edit, publish and check results, the writer is only one step of five. You can run every step by hand. Or RankControl's agents can do it for you every month, from picking the question to publishing the page and tracking whether AI engines cite it, while you focus on your product.
Know exactly what AI says about your competitors.
RankControl's Recon Agent monitors competitor citations across ChatGPT, Perplexity, Claude, Gemini, Grok, and Google AI Mode. See where they show up and you don't.
