All in One SEO (AIOSEO) vs Slim SEO (2026): which should you pick?
As of Oct 24, 2026, we pick Slim SEO: it is first in our ranking of SEO plugins and apps, and it grades higher too, 3.4 against 2.8.
Checked Oct 23, 2026 · graded Oct 23, 2026 by ToolGPA
Slim SEO grades higher on value for money, the free plan and ease of use. They get the same grade on features and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
All in One SEO (AIOSEO)
WordPress SEO plugin with schema, redirects, link suggestions and AI
Slim SEO
WordPress SEO plugin that sets meta tags and schema with no setup
Which one is for you
Pick All in One SEO (AIOSEO) if
- Fits if you run a WordPress site and want redirects and schema on the lowest paid plan
- Works for agencies covering many client sites, with up to 100 on Elite
Look elsewhere if
- Watch out: the prices shown are first-year rates and renewals are about double, so Basic goes from $49.50 to $99
- Tight if you stay on Lite, as redirects, local SEO and link suggestions all need a paid plan
- Pricey if you want local SEO, the Link Assistant or rank tracking: Plus is $199, Pro $399 and Elite $599 a year
- Skip it if you want AI writing in the editor, which needs a separate SEOBoost subscription
- Not for you if your site isn't on self-hosted WordPress, as there's no standalone app
Pick Slim SEO if
- Fits if you want SEO tags handled with very few settings to touch
- Works for freelancers adding schema and link reports across up to 10 client sites
Look elsewhere if
- Watch out: AI meta writing runs on your own OpenAI, Gemini, Claude or OpenRouter key, billed by that provider
- Tight if you stay free, as the schema builder, link tools, Search Console reports and writing tips are Pro
- Skip it if your site isn't on self-hosted WordPress, as there's no standalone app
- Watch out: Pro includes a year of updates, refunds close after 14 days, and hosts and SaaS firms must ask for a quote
How we grade them
| 2.8GPAAll in One SEO (AIOSEO)Good | 3.4GPASlim SEOVery good | |
|---|---|---|
| Value for money | BBasic is $49.50 for the first year, then $99 a year for one site, $8.25 a month, right on this category's cheaper quarter. Local SEO needs Plus at $199 a year, the Link Assistant Pro at $399, and rank tracking Elite at $599. | APersonal is $59 a year for one site, about $4.92 a month, and renews at the same price. That's under 60% of this category's cheaper quarter. Ten sites are $119 a year and unlimited sites $179. |
| Free plan and trial | BAIOSEO Lite on WordPress.org covers titles, meta descriptions, sitemaps and TruSEO checks, and one site could live on that. Redirects, local SEO and link suggestions all need a paid plan. | AThe free plugin has no caps: automatic meta and social tags, schema, XML, image and News sitemaps, breadcrumbs, redirects, 404 logs and AI meta writing with your own key. The schema builder and link tools are Pro. |
| Features | BContent scoring, schema for dozens of types, XML, video and news sitemaps, redirects with 404 logs, internal link suggestions, Search Console data with rank tracking and an MCP server. It covers the whole job, spread over four plans. | BMeta tags, connected schema, sitemaps, breadcrumbs, redirects, 404 logs and AI meta writing, then on Pro a schema builder with 30+ types, link suggestions, Search Console reports and a writing assistant. It covers the whole job. |
| Ease of use | CNo rating on record. It works inside WordPress, but there are keywords to set per post, plenty of settings, and Search Console to connect for the stats on Elite. | BNo rating on record, but it works as soon as it's on: meta tags, schema and sitemaps are written from your posts with no setup. Only the AI writing needs a key pasted in. |
| Platforms and integrations | BWeb only, inside WordPress, with a REST API from Plus. It connects to Search Console, Semrush, Microsoft Clarity and IndexNow, and works with WooCommerce, Elementor, Divi and WPML. | BWeb only, inside WordPress. It connects to Search Console, Google Analytics and Tag Manager, and to OpenAI, Gemini, Claude and OpenRouter for AI writing. |
| Best for | WordPress SEO with plans sized by site count | WordPress SEO with almost no settings |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: All in One SEO (AIOSEO) and Slim SEO. How we grade
Price against what you get
All in One SEO (AIOSEO) starts at $8.25 a month when paid by the year and scores 2.7 out of 4 on features, ease of use and platforms. Slim SEO starts at $4.92 a month when paid by the year and scores 3.0.
Slim SEO scores higher and starts $3.33 a month lower. Of the other SEO plugins and apps on the chart, 1 scores higher than All in One SEO (AIOSEO) for less, and none scores higher than Slim SEO for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- All in One SEO (AIOSEO) also covers rank tracking and site audit.
At a glance
| All in One SEO (AIOSEO) | Slim SEO | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | $99 per year for 1 site at renewal, after a first year at $49.50 | $59 per year for 1 site |
| Free plan | AIOSEO Lite, the free plugin on WordPress.org, covers titles and meta descriptions, XML sitemaps and TruSEO on-page analysis; redirects, local SEO and link suggestions need a paid plan. | Free plugin on WordPress.org: automatic meta and social tags, schema, XML, image and news sitemaps, breadcrumbs, redirects, 404 monitoring and AI meta writing with your own API key. |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Semper Plugins, LLC | Slim SEO |
| Price read from | aioseo.com | wpslimseo.com |
| Checked | Oct 23, 2026 | Oct 23, 2026 |
Worth knowing
All in One SEO (AIOSEO)
- It needs a self-hosted WordPress site; there is no standalone app.
- The displayed prices are first-year rates; renewals are at full price, about double, with a 14-day money-back guarantee.
- Local SEO starts on Plus, the Link Assistant on Pro, and Search Statistics with rank tracking only on Elite.
- The AI Writing Assistant inside the editor needs a separate paid SEOBoost subscription.
Slim SEO
- It needs a self-hosted WordPress site; there is no standalone app.
- AI meta writing uses your own OpenAI, Gemini, Claude or OpenRouter key, so the AI provider bills you separately.
- The schema builder, link tools, Search Console reports and writing assistant all need Slim SEO Pro.
- Pro licences include a year of updates and support; refunds can be requested within 14 days.
Key features
All in One SEO (AIOSEO)
- TruSEO content analysis
- Scores each post for on-page SEO and readability in the editor, with a headline analyzer. Paid plans check up to 10 keywords per post.
- Schema and sitemaps
- Adds schema.org markup for FAQs, products, recipes and dozens more types, and builds XML, RSS, HTML, video and news sitemaps.
- Redirection Manager
- Creates redirects for changed URLs from Basic up; Pro adds 404 logging, server-level redirects, full-site redirects and domain aliases.
- Internal Link Assistant
- On Pro and Elite, suggests internal links to add in one click, can link automatically and reports orphaned posts and the domains linked to most.
- Search Statistics
- Elite only: Google Search Console data inside WordPress, keyword rank tracking, post index status, content decay and the effect of SEO changes.
- AI credits and MCP server
- Paid plans include 10,000 to 200,000 AI credits for drafting posts, titles, descriptions, FAQs and images, and an MCP server lets AI agents edit SEO data.
Slim SEO
- Automatic meta and social tags
- Writes meta titles, descriptions, robots tags, Open Graph, Twitter Card and LinkedIn tags from each post with no setup, all editable.
- AI titles and descriptions
- The free plugin writes meta titles and descriptions one by one or in bulk using OpenAI, Gemini, Claude or OpenRouter, with your own API key.
- Schema, sitemaps and breadcrumbs
- Adds connected JSON-LD schema automatically and builds XML, image and Google News sitemaps. Pro adds a visual builder with 30+ schema types and custom JSON-LD.
- Redirects and 404 monitoring
- Set redirect rules, force www or non-www, log 404s and redirect automatically when a post's slug changes, on the free plugin.
- Link manager
- Pro scans every link for status, suggests internal links from post content, fixes broken or redirected links in bulk and reports orphan pages.
- Search Console and writing assistant
- Pro shows Search Console performance, keyword and page reports in WordPress, and gives tips on keywords, images, links and readability while writing.
Plans
All in One SEO (AIOSEO)
AIOSEO Lite$0
The free WordPress.org plugin with the core SEO settings, sitemaps and on-page analysis.
Basic$99
per year for 1 site at renewal, after a first year at $49.50
Smart schema, WooCommerce SEO, automatic redirects, 10 TruSEO keywords, unlimited SEO audits and 10,000 AI credits.
Plus$199
per year for 3 sites at renewal, after a first year at $99.50
Basic plus local business SEO, author SEO (E-E-A-T), image SEO, REST API access and 25,000 AI credits.
Pro$399
per year for 10 sites at renewal, after a first year at $179.55
Plus plus the Internal Link Assistant, 404 tracking, full-site redirects, video and news sitemaps and 50,000 AI credits.
Elite$599
per year for 100 sites at renewal, after a first year at $239.60
Pro plus Search Statistics with keyword rank tracking, index status and content decay, client management and 200,000 AI credits.
Slim SEO
Slim SEO$0
The free WordPress.org plugin with automatic meta tags, schema, sitemaps, redirects and AI-written metadata.
Personal$59
per year for 1 site, renews at the same price
Slim SEO Pro on 1 site: visual schema builder, link suggestions and health monitoring, Search Console reports and the writing assistant.
Freelancer$119
per year for 10 sites, renews at the same price
The same Pro features on up to 10 sites, with a year of updates and support.
Agency$179
per year for unlimited sites, renews at the same price
The same Pro features on unlimited sites. Hosts, SaaS companies and maintenance services must ask for a quote.
Ways to pay less
All in One SEO (AIOSEO)
- Other savings
Half price or less for the first year
First-year prices: Basic $49.50 then $99, Plus $99.50 then $199, Pro $179.55 then $399, Elite $239.60 then $599 a year. Renewals are at full price.
Slim SEO
- Education
Education licence discount on request
The Slim SEO Pro page invites schools and other educational buyers to contact the team for a discounted licence. The amount is not stated.
- Nonprofit
Nonprofit licence discount on request
The Slim SEO Pro page invites nonprofits to contact the team for a discounted licence. The amount is not stated.
Common questions
Which is cheaper, All in One SEO (AIOSEO) or Slim SEO?
As of Oct 23, 2026, Slim SEO is cheaper to start with: $4.92 a month when paid by the year, against $8.25 a month when paid by the year for All in One SEO (AIOSEO). All in One SEO (AIOSEO) starts at $99 per year for 1 site at renewal, after a first year at $49.50, and Slim SEO starts at $59 per year for 1 site.
Which has a free plan, All in One SEO (AIOSEO) or Slim SEO?
As of Oct 23, 2026, both All in One SEO (AIOSEO) and Slim SEO have a free plan.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.