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7 WordPress AI SEO plugins ranked by what they actually cost

Cagri Sarigoz

Published October 6, 2026

If your WordPress archive has dozens of posts with missing metadata, blank alt text, and no internal links pointing at your newest content, AI plugins can help. The question is which ones are worth paying for, and whether the plugin you already run has the feature buried in a tier you have not tried yet.

The author of the source comparison has spent 20 years building publishing websites, led Reflector Media, and now owns Search Engine Watch. This shortlist was checked against vendor documentation on October 3, 2026. Every price here is exactly as the vendor displayed it.

️ The Seven Plugins and Where Each One Fits

Start With the Backlog, Not the Plugin

A WordPress archive contains several distinct jobs. Titles need to be clear for search. New guides deserve inbound links from older relevant posts. Screenshots need descriptions that explain what the reader is meant to notice. Each job calls for a different tool and a different kind of review.

The first five plugins in this list are full SEO suites. Pick one of them as your main plugin and give it responsibility for titles, canonical URLs, sitemaps, and structured data. Add a specialist like Link Whisper or AltText.ai only for a remaining job that your main plugin does not cover well. Installing a second full SEO suite creates a duplicate settings problem your current plugin probably already handles.

For a handful of articles, writing titles manually is still the faster path. The AI case gets stronger when you have dozens of posts to revisit and need a usable batch of suggestions, a way to preserve good existing metadata, and a review step before anything goes live.

1. Slim SEO: no plugin license fee for AI metadata

Slim SEO includes its AI integration in the free plugin. You connect a supported provider account, pick a model, and generate titles and descriptions from your existing content. The current documentation lists Anthropic, Google, OpenAI, and OpenRouter as supported providers. Provider billing is required.

The feature worth noting is its bulk generator. You choose post types and taxonomies, then decide whether to keep existing metadata or overwrite it. That makes it a practical option for filling empty fields while leaving titles an editor has already written intact.

This is the first pick for a new, straightforward publishing site or a site already running Slim SEO. Someone still has to manage the provider account and the usage bill. An editor who wants a small, vendor-managed credit purchase should look at AIOSEO Lite instead.

2. AIOSEO: batch metadata review without upgrading to Pro

AIOSEO’s AI Bulk Actions are available to Lite users, which makes it worth checking before buying a paid plan. Purchased credits fund titles, descriptions, and image alt text. The displayed pay-as-you-go option is $9.99 for 10,000 credits, valid for one year. The documentation says a generated title or description uses 10 AI credits; extra versions and other AI features consume more of the balance.

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The workflow lets you select posts, generate suggestions, and choose a version for each post in the Bulk Generator. That selection step is the practical part. It is more useful than a promise to write an entire article.

This is the first choice for an existing AIOSEO Lite site whose immediate job is titles and descriptions. The paid SEO plans include other features, but those are a separate decision from the metadata task.

3. Yoast SEO Premium: the upgrade to try if you already use Yoast

Yoast Premium costs $118.80 per year, excluding VAT, and includes AI help with titles and descriptions. Its generation workflow presents five options, lets you request more, and applies your choice. It also includes AI Optimize, which checks keyphrase use in the introduction, keyword density and distribution, and paragraph and sentence length.

The case for Yoast is strongest when editors already work inside it daily. For an existing Premium subscriber, trying these features before paying for another metadata service is the right sequence. A Yoast Free user faces an upgrade decision where the full SEO feature set needs to justify the cost alongside the AI tools.

One operational limit to know: Yoast publishes a cap of 100 requests per day and 3,000 per month per subscription for each WordPress site, alongside shorter-window limits. A large archive refresh may need to run across several sessions even when the monthly allowance looks sufficient.

4. Rank Math AI: multiple maintenance tasks in one subscription

Rank Math AI bundles Content AI, AI Link Genius, and AI Visibility. For archive work, the relevant questions are whether it can generate metadata, surface link opportunities, and describe images without adding separate tools. Those are tasks an existing Rank Math user can evaluate inside the same setup.

Rank Math’s migration documentation replaced the old credit system with monthly allowances per feature. The displayed Starter price is €71.88 for the first year and €83.88 at renewal, excluding tax. Starter includes 50 image alt-text generations per month; Creator includes 100, at a displayed annual price of €131.88 initially and €143.88 at renewal, excluding tax.

Bulk metadata actions for titles and descriptions require a paid Rank Math AI plan. The limited free AI access lets you inspect selected features before committing.

This is the first shortlist pick for a Rank Math site with several maintenance jobs queued up. Check its included link tools before adding Link Whisper, and check its image allowance before paying for a separate image service. Buying Rank Math PRO and buying a Rank Math AI plan are separate purchases unless the current offer explicitly bundles them.

5. SEOPress PRO: bulk work with flexible AI billing

SEOPress PRO costs $49 per year for one site, excluding tax. Five sites cost $59 per year; an unlimited-site license costs $149. The AI options include your own provider key or an optional SEOPress AI Credits subscription that handles provider access through SEOPress directly, removing the need to open a separate account with each model provider.

The feature coverage includes titles, descriptions, bulk generation, command-line use, bulk image descriptions, and related metadata. That gives it a practical place on an archive-heavy site, especially when someone on the team already manages provider billing.

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The plugin license covers the integration; AI usage is additional. With the managed credits option, multiple task types draw from a shared allowance. The author recommends estimating the combined metadata and image workload before choosing a monthly managed plan, because actual consumption varies with the model and content length.

6. Link Whisper: find older posts that should link to your newest content

Internal linking is the maintenance job most distinct from writing titles. A new guide may have useful passages sitting in older posts that nobody has linked yet. Link Whisper’s inbound-link workflow lets you choose a destination post and search across the entire site for candidate source paragraphs.

The paid version provides inbound and outbound suggestions with insertion after approval. The free version offers outbound suggestions that you insert manually. The current displayed one-site license is $97 per year. The vendor’s pages describe credits and promotions differently, so confirm the AI allowance in the purchase offer before buying.

This is worth the cost when finding inbound links across a large archive is the actual backlog. If Rank Math AI or your current SEO suite already covers that workflow, evaluate it there first.

For an editorial site, approve the destination and the sentence together. A broad phrase like “AI tools” may appear in many articles; the right destination depends on what that specific paragraph is actually explaining.

7. AltText.ai: the lowest-cost entry point for image descriptions

AltText.ai is a single-purpose add-on: it describes images. The plugin is free, and new accounts get 25 introductory credits. After that, 50-credit packs cost $3. Standard-format images use one credit each.

For a site with a backlog of undescribed images, this is the cheapest way to address that specific job without changing your main SEO plugin. It belongs in the stack only when your main plugin does not already cover image descriptions adequately.

What a 40-article refresh actually costs

To make the allowances concrete, consider one title and one description for each of 40 existing posts, plus alt text for 100 standard-format images. That is 80 metadata outputs and 100 image descriptions, before retries.

• Slim SEO: No plugin license cost for metadata. Provider charges depend on the model and input length. Image work is budgeted separately.
• AIOSEO: 80 metadata outputs at 10 credits each equals 800 credits. Repeated monthly, that is 9,600 credits per year before extra suggestions or other AI use. A $9.99 pack covers roughly a year of that basic workload.
• Yoast Premium: 80 single title and description requests fit within the published 100-request daily limit if other usage does not consume it. Image work is budgeted separately.
• Rank Math AI Starter: 50 monthly image descriptions cover half the image batch. Creator (€131.88 initially, €143.88 at renewal, excluding tax) allows 100 per month.
• AltText.ai: 100 standard-format descriptions use 100 credits, which is two $3 packs, or $6, ignoring introductory credits.
• SEOPress managed Starter plan: 400,000 shared credits for $19 a month, with vendor estimates of about 250 titles, 220 descriptions, or 130 image descriptions. Using those estimates, the combined batch consumes roughly 444,400 credits in total. Actual consumption varies with model and content length.

These figures cover generation and published limits only. The editor still has to choose titles, review descriptions, and check images. Record that time alongside the bill when deciding whether a plugin earns its place in the workflow.

How to test a plugin before committing the whole archive

Start with ten existing articles: a few with missing metadata, a few with strong titles worth keeping, and a few where the wording needs work. Give the candidate plugin the same selected posts and look at the suggestions before choosing a larger plan.

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For each post, keep the old title, the suggested title, and the final choice in a review sheet. Note whether the plugin preserved existing fields, how many credits or requests the batch consumed, and how long it took to reach an acceptable version. A suggestion that needs to be rewritten from scratch belongs in that record too.

For links, choose one new guide and review suggested source paragraphs from older posts. For images, include an informative photo, a screenshot, and a decorative asset so the review covers their different purposes.

A note on AI visibility features

Several of these products also include features described as AI visibility, agent readiness, or llms.txt support. The author recommends assessing those against the specific search service and task they address, separately from metadata generation.

For Google specifically, the published requirements for AI Overviews and AI Mode emphasize an indexed page eligible for a search snippet, accessible content, internal links, and structured data that matches the page. Google’s generative AI optimization guide states that Google Search ignores llms.txt and similar special files. The safer first investment is helping editors maintain pages people can find and use.

Cagri Sarigoz( Founder )

I’m founder of BizStack at Cagri Sarigoz LLC and a passionate advocate for entrepreneurs.

With over 14 years in tech, marketing, and AI, including my role as Head of SEO at CitizenShipper and co-founder of TaleBot at Intale AI, I’m dedicated to sharing genuine, useful product insights and tips.

At BizStack, I aim to cut through the digital noise to provide clear, actionable advice.

And more than all else, I’m a father to a (always) little girl and a husband.

Contact me at [email protected] for assistance.