WordPress · · 6 min read · By Mobilize Cloud
If you're asking which is the best SEO plugin for AI search, the short answer is that Yoast SEO, Rank Math and All in One SEO (AIOSEO) can all create an llms.txt file and all output the basic schema markup AI tools and search engines read. The differences are in how much control you get over the llms.txt file, which schema features are free, and how each one feels to use.
The more useful answer: if you already run one of them and it's set up properly, switching probably isn't worth it. What matters more is that the settings are filled in and the output is checked. Here's how they compare, as of October 2026. Plugins update often, so check each one's documentation (linked below) before you decide.
A quick word on "AI search readiness"
No plugin can make an AI assistant recommend you. Google says there are no special requirements or markup needed to appear in its AI features beyond normal Search eligibility (see AI features and your website), and other AI companies haven't published how they use llms.txt or schema. What a good SEO plugin can do is cover the basics: a clean llms.txt, accurate structured data about your business, a sitemap, and pages search and AI crawlers can read. That's what we're comparing.
llms.txt support
Yoast SEO
Yoast added llms.txt to the free plugin in version 25.3, in June 2025. You turn it on under Yoast SEO → Settings → Site features → AI tools → llms.txt (Yoast's guide).
- It writes a real file to your site's main folder and updates it weekly.
- By default it includes a handful of your most recently updated posts and pages, favoring cornerstone content, plus your most-used categories and tags (Yoast's specification).
- You can switch to manual page selection and choose the pages yourself. We'd recommend doing that, so your key service and contact pages are always in it.
- Yoast says it isn't available on WordPress multisite.
In the Yoast files we check, we often see a short note above the # Title line. Our validator flags it as a minor "should fix" because the title should come first, but AI tools generally skip it, so it only costs a few points.
Rank Math
Rank Math has an LLMS Txt module that you switch on from Rank Math SEO → Dashboard, then configure under Rank Math SEO → General Settings → Edit llms.txt (Rank Math's guide). Its knowledge base doesn't list it as a Pro-only feature.
- You choose which post types and taxonomies to include. Posts set to noindex are left out.
- You set a maximum number of items (the default is 100).
- An Additional Content field lets you add your own text to the file.
The default limit is high for a file meant to be a short summary. For most small sites, we'd lower it and lean on the additional content field to describe the business properly.
All in One SEO (AIOSEO)
AIOSEO puts llms.txt under All in One SEO → Sitemaps → LLMs.txt, and it's switched on by default (AIOSEO's guide).
- You can set the title and description, choose post types and taxonomies, set how many links per type, and exclude specific posts or pages.
- The free (Lite) version creates llms.txt. According to AIOSEO's feature page, llms-full.txt and the Markdown settings need a Pro plan.
Because it's on by default, many AIOSEO sites have an llms.txt their owners have never looked at. Worth a check.
Schema controls
All three output Organization (or Person) markup from your site settings and basic markup for posts and pages. Where they differ is in local business, product and FAQ markup, and in what's free. For what each schema type does, see the 5 schema types that matter most.
Yoast SEO builds all your structured data into one connected graph. The free plugin lets you choose a page or article type for each piece of content, and its FAQ block (free) adds FAQPage markup. Local business markup comes with Yoast Local SEO, which Yoast includes in Premium, WooCommerce SEO and its AI+ bundle rather than the free plugin. Detailed product markup is handled by Yoast WooCommerce SEO (Yoast's schema overview).
Rank Math is the most generous with schema in its free version. Its plugin listing advertises more than 16 schema types for free, and its Local SEO module (business type, address and opening hours) works in the free plugin under Titles & Meta → Local SEO. Pro adds an advanced schema builder, schema templates, importing schema from other pages, and multiple locations (Rank Math's Local SEO guide).
AIOSEO sets your Organization or Person details under Search Appearance → Global Settings. Per-page schema controls, including FAQ markup, need a Pro plan (Basic or above, according to AIOSEO's docs), and Local SEO is an addon included in its higher paid plans. Check AIOSEO's pricing page for which plan includes what.
One note on FAQ markup: Google stopped showing FAQ rich results in May 2026, so it matters far less than it did when these plugins built their FAQ features.
Side by side
| Yoast SEO | Rank Math | AIOSEO | |
|---|---|---|---|
| llms.txt in free version | Yes | Yes (not listed as Pro) | Yes |
| On by default | No | No (module must be enabled) | Yes |
| Hand-pick pages | Yes (manual selection) | By post type, taxonomy and limit | By type, plus exclusions |
| Add your own text | No option documented | Yes (Additional Content) | Title and description |
| llms-full.txt | Not documented | Not documented | Pro |
| Local business schema | Premium (Local SEO) | Free (single location) | Paid addon |
| FAQ markup | Free (FAQ block) | Free | Pro |
"Not documented" means we couldn't find it in the plugin's own documentation as of October 2026, not that it definitely doesn't exist.
Ease of use
This part is a matter of taste, so here's how we'd put it.
- Yoast is the calmest of the three. Fewer settings, sensible defaults, and llms.txt is a single switch. Good for owners who want to set it once and leave it.
- Rank Math has the most switches and modules. That's great if you like control, and a lot to take in if you don't. Its free tier is generous on schema.
- AIOSEO sits in between, with a setup wizard and settings grouped by task. It turns llms.txt on for you, which helps the hands-off owner, as long as someone checks the output.
Which is the best SEO plugin for AI search?
For most sites, the honest recommendation is whichever one you already have, configured properly. Switching SEO plugins means migrating titles, descriptions and redirects, and the AI-related differences are small. Never run two SEO plugins at once: you'll get duplicate schema and two plugins fighting over llms.txt.
If you're starting fresh:
- A local business on a budget: Rank Math, for free local business schema.
- A simple brochure or blog site: Yoast, for its simplicity and manual page selection in llms.txt.
- You want llms-full.txt from a plugin: AIOSEO Pro is the only one of the three that documents it.
Whatever you choose, the plugin's llms.txt is a starting point. Plugin files are generated from your post list, so they rarely say what your business does in the words you'd choose. If you'd rather write it yourself, turn the plugin's llms.txt feature off and publish your own file with our generator instead.
Check the output, not the settings
Settings pages tell you what a plugin intends to do. The live file and your robots.txt tell you what it actually did. After any change:
- Run your site through the llms.txt validator to check the file's format and links.
- Run the AI readiness check to confirm AI crawlers aren't blocked, your business schema is present and your content is readable without JavaScript.
- List your site so it's re-checked automatically. Plugin updates are one of the most common reasons files change without anyone noticing, and our Nightly plan emails you exactly what changed.
Bottom line: Yoast, Rank Math and AIOSEO all handle llms.txt and core schema well enough. Rank Math is the most generous for free, Yoast the simplest, AIOSEO the most hands-off. Keep the one you have, fill in its settings, and check what it actually publishes.
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