A lot of “best AI SEO tools” lists read like a tour of vendor feature pages. We ran three of them on the same small website on the same day, and every one told us something the others missed. For everything else on this page, we say plainly that we only read the vendor’s own pricing page.
What AI SEO Tools Actually Do in 2026
AI SEO tools exist because AI answers now sit between your page and the click. Pew Research Center found that Google users who saw an AI summary clicked a traditional result in 8% of visits, against 15% for users who saw no summary, and clicked a link inside the summary in just 1% of visits (Pew Research Center, 2025). If fewer people click, you need to know whether the answer itself mentions you.
That’s the new part. The rest of “AI SEO” is older work with AI added on top. When we sorted the category, every product we looked at did one of three jobs:
- Track AI answers. You give the tool a list of prompts, it asks AI engines, and it reports whether your site is mentioned or cited. People call these GEO tools or AI visibility trackers.
- Audit your site for AI search. The tool crawls your pages and flags problems that keep AI crawlers out or make content hard to quote.
- Write and optimize content. The tool scores a draft against what already ranks, suggests terms, and often drafts text with a built-in AI writer.
Why does that split matter? Because most “best AI SEO tools” lists mix all three jobs into one ranking, then compare a citation tracker with an AI writer as if they did the same thing. They don’t. Pick the job first, then the tool.
Key Takeaways
In our October 2026 test, Otterly.AI counted 244 citations across four AI engines for 5 prompts, and none of them pointed to our site. Track AI answers before you buy content tools: Google says its AI features rest on its core ranking systems (Google Search Central).
Quick Verdict: The Best AI SEO Tools by Job
Otterly.AI was the best AI answer tracker we tested, covering four engines from $29/month, while a free Semrush account was the best no-cost start, with an AI Search Health score inside its Site Audit. Here is the full short list, with a clear line between what we ran and what we only read about.
| Job | Tool | Why it’s on the list | Tested by us? |
|---|---|---|---|
| Track AI answers across many engines | Otterly.AI | ChatGPT, Google AI Overview, Perplexity and Microsoft Copilot in the base plan | Yes, October 21, 2026 |
| Track only your own few prompts | Writesonic AI Search Tracking | No prompt minimum; reports share of voice | Yes, October 21, 2026 |
| Free AI search audit | Semrush (free account) | Site Audit shows an AI Search Health score and an AI crawler panel | Yes, October 21, 2026 |
| Optimize content plus track AI prompts | Surfer | Content Score and an AI tracker in one plan | No, official pricing page only |
| Optimize content with unlimited seats | Clearscope | Unlimited users on every plan; tracks queries in ChatGPT and Gemini | No, official pricing page only |
| Draft, optimize and publish | Frase | Cheapest entry plan of the three content tools; 7-day trial with no card | No, official pricing page only |
Does a tool we didn’t test still belong on the list? Only as context. We kept Surfer, Clearscope and Frase because they show up on many of the top-ranking lists for this topic, and you’ll meet them anyway. We just won’t pretend we know how they behave.
How We Tested Three AI SEO Tools (and What We Didn’t)
We tested Otterly.AI, Writesonic and Semrush on October 21, 2026, with one work account, Google sign-in and no card, on a small marketing website our own team runs. The two AI answer trackers got the same five prompts, with the market set to United States and English.
The five prompts covered a definition, a how-to and a buying question:
- What is generative engine optimization (GEO)?
- How can I get my website cited by ChatGPT?
- What are the best tools to track AI search visibility?
- How do I optimize content for Google AI Overviews?
- A local question about AI SEO agencies in our own market.
Semrush got the tasks we run on every SEO tool: sign up, research one keyword, audit our site, look up backlinks, set up rank tracking and write down every free limit. We copied numbers straight from the screen and kept masked screenshots.
Here’s what we did not do. We didn’t open Surfer, Clearscope or Frase. We didn’t press any button that changes billing. And we only had one day of data, so nothing here is a trend. When this page gives a number for a tool we didn’t test, it comes from that vendor’s pricing page as it read on October 23, 2026, and we link to it.
One more note on money: Indie Stack Lab may add affiliate links to some tools later. Affiliate links are labeled, and they don’t change what we tested or wrote down.
Otterly.AI: Best for Tracking Citations Across Four AI Engines
Otterly.AI checked four AI engines for every prompt and counted 244 citations across our five prompts, the most complete picture of any tool we ran. All four included engines (ChatGPT, Google AI Overview, Perplexity and Microsoft Copilot) answered all five prompts, and Google AI Mode, Gemini and Claude were offered as paid add-ons.
What did it tell us about our own site? Brand coverage 0% on every prompt, and 0 citations of our domain. That’s an honest answer for a small site. A GEO tool should tell you that before you spend money on fixes, not after.
The catch came at setup. The prompt step said it “recommends” 15 prompts, but the Next button stayed off at 5 and at 14 and only turned on at exactly 15. We kept our five and added ten suggestions to get through. So if you care about only a handful of questions, you’ll still track 15.
A few more things we saw:
- The first report took several minutes, with “Today’s data is still processing” until then.
- An interactive demo window covered the report and had no close button; a page reload cleared it.
- Otterly replaced the brand name we typed with one it generated from the domain.
- ChatGPT produced 130 of the 244 citations, and Perplexity cited exactly 10 sources on every prompt.
Pricing in the app: Lite at $29/month for 15 prompts, Standard at $189 for 100 prompts and Premium at $489 for 400 prompts. The trial ran 7 days with no card and allowed 50 prompts and 100 GEO audits. Otterly’s public pricing page also lists unlimited team members and daily tracking on Lite (Otterly.AI pricing); we didn’t test the audit tools.
Want the prompt-by-prompt numbers and the full setup walkthrough? Our Otterly.AI vs Writesonic GEO tools comparison has the citation table for every engine.
Writesonic AI Search Tracking: Best for Tracking Only Your Own Prompts
Writesonic let us track exactly our 5 prompts with no minimum, and its first report analyzed 5 answers across 3 AI platforms: ChatGPT, Gemini and Google AI Overviews. If you already know the questions that matter to your business, that control is the main reason to pick it.
The report format is built for people who report upward. It showed AI visibility at 0% (0 of 5 answers), share of voice at 0% (rank 6 of 6) and citation share at 0%. The dashboard later listed 15 answers, all at 0% visibility. Our site wasn’t cited anywhere, same as in Otterly.
So what’s the catch? Writesonic doesn’t have a free tier for AI search tracking. To get past the first report, we had to pick a plan and press “Start free trial.” The banner then said: “Once the trial ends, you’ll automatically be upgraded to your Starter plan.” We opened billing to check, and it read “Payment method: No card added.” We’d rather see that line on the first screen.
Other things worth knowing from our setup:
- Writesonic pre-selected 24 suggested prompts across five topics. Clearing them meant opening each topic in turn.
- It suggested ten competitors and pre-selected five.
- A 13-minute product tour started after onboarding; “Skip anyway” ends it.
Pricing in the app: Starter at $79/month billed annually for 50 prompts and 1 project, shown in billing as $948.00 per year; Basic at $199 for 100 prompts; Growth at $399 for 200 prompts and 2 projects. Writesonic’s public pricing page says Starter also includes 15 AI articles per month and 10 site audits of 100 pages each (Writesonic pricing). We didn’t test the article writer or the audits, so treat those as the vendor’s description.
Semrush Free Account: Best Free Starting Point for AI Search Health
A free Semrush account gave us an AI Search Health (beta) score of 95% for our site inside a standard Site Audit, which makes it the cheapest way we found to check whether AI search can read your pages. Semrush’s own plan page says the free tier includes 10 reports per day and “a limited set of AI Visibility features” (Semrush).
What did the audit show? The setup screen capped it at 100 pages per audit and scheduled it weekly. It finished in a few minutes with Site Health at 89% and AI Search Health at 95%. Among the top issues, Semrush listed “Content not optimized for AI Search” on 4 pages, next to classic problems such as broken internal links on 93 pages.
The overview also carried a “Blocked from AI Search” panel naming ChatGPT-User, OAI-SearchBot, Googlebot and Google-Extended. We didn’t open its detail, so we can’t tell you exactly what it flagged on our site. But the panel itself points at the right question: can AI crawlers reach your pages at all?
Two more AI touches on the free account:
- Position Tracking offered ChatGPT and Gemini as search engines next to Google. We only set up Google, with a limit of 10 keywords.
- Keyword Overview returned seven metrics for our one test keyword, with a prompt to upgrade for advanced metrics.
What about prompt tracking like Otterly’s? That sits in paid plans. Semrush’s plan page says the Starter plan covers Google Search, ChatGPT, Perplexity and Gemini with 50 prompts tracked daily (Semrush), and the in-app subscription page priced Starter at $199/month. We didn’t start a trial; the sign-up flow defaults to a Pro+ trial that becomes $299/month, and the free path is the smaller “Skip trial” button.
For the keyword side of the same account, see what one keyword lookup on a free Semrush account showed us. For the whole free toolkit, start with our Semrush SEO tools review.
Same Site, Three Tools: What They Agreed On
All three AI SEO tools we tested pointed the same way on October 21, 2026: AI engines didn’t cite our small site in any of the 5 prompts, while the Semrush audit scored its AI readiness at 95%. Put together, that says the site was readable but not yet worth quoting.
| What we checked | Otterly.AI | Writesonic | Semrush (free) |
|---|---|---|---|
| Main job | Track AI answers | Track AI answers | Audit the site |
| AI engines or platforms | 4 included, 3 as add-ons | 3 on the Starter trial | ChatGPT and Gemini offered in Position Tracking |
| Our site cited or visible | 0 citations, 0% coverage | 0% visibility, 0% share of voice | Not measured |
| AI-related score | Not shown | Not shown | AI Search Health 95% |
| Prompt or page limit at setup | 15-prompt minimum | No minimum | 100 pages per audit |
| Cost to keep using | From $29/month | From $79/month billed annually | $0 for the free account |
What surprised us was how well the two views fit together. The trackers said “nobody quotes you.” The audit said “it isn’t a crawler problem.” That rules out the cheap fix and leaves the slow one: content that AI engines want to cite.
Would one tool alone have told us that? No. A tracker without an audit can’t tell you whether AI engines can read your pages, and an audit without a tracker can’t tell you whether they quote them.
AI Content Optimization Tools We Haven’t Tested: Surfer, Clearscope and Frase
Surfer, Clearscope and Frase show up on many lists of top AI SEO tools, and all three now sell AI answer tracking next to content optimization, with entry plans from $39 to $129 a month on their own pricing pages. We haven’t run any of them, so everything below comes from those pages as they read on October 23, 2026.
Why include tools we haven’t tested? Because they do the third job, content optimization, that none of our three tested tools covers in depth. Here is what each vendor says, and nothing more.
Surfer
Surfer’s pricing page lists five plans, all shown per month and billed yearly (Surfer pricing). Discovery costs $49 and covers 120 documents with no AI prompt tracking. Standard costs $99, with 360 documents and 25 AI prompts refreshed weekly in ChatGPT. Pro costs $182, with 50 prompts refreshed daily across ChatGPT, Perplexity, Google AI Mode, Google AI Overview and Google Gemini. A separate AI Search Analytics plan costs $82 for tracking only.
Every plan button says “Start for Free,” but the page doesn’t state a trial length. Check that before you enter a card.
Clearscope
Clearscope’s pricing page lists Essentials at $129/month and Business at $399/month, with “14 day free trial” in the page header (Clearscope pricing). Essentials includes 50 tracked queries, 50 pages, 20 topic explorations and 20 drafts a month. Every plan allows unlimited users, and the page says query tracking covers ChatGPT and Gemini.
That unlimited-users line stands out for teams. Most tools in this space charge per seat sooner or later.
Frase
Frase’s pricing page lists Starter at $39/month billed yearly or $49 month to month, with a “Free 7-day trial. No credit card.” (Frase pricing). Starter includes 1 seat, 1 site, 10 articles and 50 audit pages a month, plus AI Visibility on ChatGPT and Google AI with 50 tracked prompts. Professional ($103/month billed yearly) adds Perplexity, and Scale ($239/month billed yearly) adds Claude and Gemini.
Frase also says Starter “simply stops at its monthly limits,” so a surprise bill isn’t possible on that plan. That’s a useful promise for a solo budget, if it holds.
Free AI SEO Tools: What You Can Use Without Paying
The best free AI SEO tools we found were a free Semrush account, with 10 reports a day (Semrush), and Google Search Console’s Generative AI performance report. Every dedicated AI answer tracker we checked offered a trial instead of a free plan.
Here are the free plans and trials in one place:
| Tool | Free plan? | Trial | Card needed for trial? |
|---|---|---|---|
| Semrush | Yes: 10 reports a day, 1 demo project | 7-day Pro+ trial offered at sign-up | Not tested; we skipped the trial |
| Google Search Console | Yes, free | Not applicable | No |
| Otterly.AI | No | 7 days | No, in our test |
| Writesonic AI Search Tracking | No | 7 days, trial of a paid plan | No, in our test |
| Frase | No free plan listed | 7 days, per its pricing page | “No credit card,” per its pricing page |
| Clearscope | No free plan listed | 14 days, per its pricing page | Not stated on the page |
| Surfer | No free plan listed | Not stated on the page | Not stated on the page |
Google’s guide recommends the Search Console report for measuring “how your content is performing in generative AI features on Google Search and Discover” (Google Search Central). It only covers Google, not ChatGPT or Perplexity. Still, it’s free, and it’s Google’s own data.
Can you run a real AI SEO workflow for $0? For a while, yes. Audit with Semrush, watch Google’s report in Search Console, and use a 7-day tracker trial to take one snapshot of how AI engines answer your prompts. That snapshot is what we did, and it was enough to show us where our site stood.
AI SEO Tools for Small Business and Marketing Agencies
For a small business, the cheapest paid AI answer tracker we tested was Otterly.AI’s Lite plan at $29/month; for marketing agencies, the deciding features are workspaces, seats and client reports, which vary a lot between vendors. Who will read the reports: you, your boss or a client? Match the tool to that reader.
AI SEO tools for small business. Start free with Semrush’s Site Audit. If you want to know whether ChatGPT mentions you, Otterly.AI’s Lite plan is the lowest monthly price we saw, but budget for its 15-prompt minimum. If you’d rather track five questions and nothing else, Writesonic lets you, at a higher price billed annually.
Content-heavy small teams. If your problem is writing, not tracking, look at Frase’s Starter plan or Surfer’s Discovery plan on their own pricing pages. We haven’t tested either, so run the trial on one real article before you commit.
AI SEO tools for marketing agencies. Check what each plan says about clients. Otterly’s pricing page offers agency partners 150 prompts on Standard (versus 100) and 500 on Premium (versus 400) (Otterly.AI pricing). Surfer’s Pro plan lists 5 brand workspaces (Surfer pricing), and Frase’s Scale plan lists exportable client reports (Frase pricing). Clearscope’s unlimited users matter if many writers touch the same account.
Honestly, some teams shouldn’t buy a tool at all. If you’d rather hand the work to someone, read our guide to red flags in GEO agency pitches first. A tool only shows you the gap; somebody still has to close it.
What to Skip When You Buy AI SEO Tools
Skip anything that promises AI rankings: Google’s own guide says “No third-party tool has access to our internal ranking or AI systems” (Google Search Central). That one sentence filters out a lot of sales pages.
The same Google guide lists tactics you can ignore for Google Search. If a tool’s main selling point is one of these, think twice:
- llms.txt and other “special” markup. Google says you don’t need new machine-readable files to appear in its AI features, because “Google Search itself doesn’t use them.”
- “Chunking” content. Google says there’s “no requirement to break your content into tiny pieces for AI to better understand it.”
- Rewriting content just for AI. Google says AI systems understand synonyms, so you don’t need every long-tail variation.
- Inauthentic “mentions.” Google says seeking them “isn’t as helpful as it might seem.”
- Special schema for AI. Google says there’s “no special schema.org markup you need to add,” though structured data still helps with rich results.
Those points cover Google only. ChatGPT, Perplexity and the rest may treat files like llms.txt differently, and Google doesn’t speak for them.
From our own test, add three more things to skip:
- Padding your prompt list to pass setup. Otterly made us track 15 prompts to get through. Pick the extra ten with care, or they’ll fill your reports with noise.
- Comparing an annual price with a monthly one. Writesonic’s $79 is the monthly share of a $948.00 yearly bill, while Otterly’s $29 is a monthly price. The Surfer pricing page we read showed only yearly-billed prices, too.
- Judging a tool on day one. Both trackers showed our site at 0% on the first day. That’s a baseline, not a verdict on the tool or the site.
Why are these mistakes so common? Because the category is new, and pricing pages are written to sell. Read them twice.
AI SEO Tool Pricing Side by Side
Entry prices for the six AI SEO tools on this page run from $0 for a free Semrush account to $129/month for Clearscope Essentials, but the billing terms differ so much that the sticker price alone misleads. Here’s each entry plan with its billing period spelled out.
| Tool | Entry plan | Price | Billing | Source |
|---|---|---|---|---|
| Semrush | Free account | $0 | Not applicable | Our test, plus Semrush plan page |
| Otterly.AI | Lite, 15 prompts | $29/month | Monthly | Our test (in-app) |
| Frase | Starter, 50 prompts | $39/month | Billed yearly ($49 month to month) | Frase pricing page |
| Surfer | Discovery, no prompt tracking | $49/month | Billed yearly | Surfer pricing page |
| Writesonic | Starter, 50 prompts | $79/month | Billed annually ($948.00 per year) | Our test (in-app) |
| Clearscope | Essentials, 50 tracked queries | $129/month | Monthly | Clearscope pricing page |
Which one is cheapest for tracking AI answers specifically? Among the plans with prompt tracking, Otterly’s Lite was the lowest monthly price we saw, at $29 for 15 prompts. Frase’s Starter lists 50 prompts at $39 billed yearly, but we haven’t tested how its tracking works.
Choosing Your First AI SEO Tool: A Five-Step Plan
Start with the free Semrush audit, then take one AI answer snapshot with a 7-day trial: in our test, those two steps showed a site that AI could read but didn’t cite. Here’s the plan we’d follow again.
- Write down five prompts your customers actually ask. Do it before you open any tool, so its suggestions don’t pick them for you.
- Run a free site audit. Semrush’s free account checks 100 pages and gives you an AI Search Health score.
- Take one snapshot with a tracker trial. Otterly.AI and Writesonic both gave us 7 days with no card. One day of data was enough for a baseline.
- Decide which job you’re paying for. Tracking, auditing or writing. If the answer is writing, trial a content tool on one real article.
- Read the billing line before you upgrade. Check whether the price is monthly or yearly, and what happens when the trial ends.
What if every tool says you’re invisible, like ours did? Then you’ve learned the most useful thing a tool can tell you, for free or close to it. The work after that is content, and no tool does that part for you.
References
- Pew Research Center: Google users are less likely to click on links when an AI summary appears in the results (2025)
- Google Search Central: Optimizing for Generative AI Features on Google Search
- Semrush: Subscriptions and Toolkits
- Otterly.AI: Pricing
- Writesonic: Pricing
- Surfer: Pricing
- Clearscope: Pricing
- Frase: Pricing