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If your site runs on WordPress, is an SEO plugin all you need?
Summary
For work on your own site, one plugin is usually enough. The paid versions of Yoast, SEOPress and AIOSEO sell editing of titles and descriptions, schema, redirects and similar controls that live inside WordPress. Researching a competitor's keywords or backlinks, or logging daily rankings for a list of queries, needs data that plugins don't collect, and that is where an external SEO tool comes in.
Running more than one site changes the math
Plugin vendors count sites differently, and the gap grows with every site you add.
SEOPress PRO costs $49 a year for one site, $59 for five and $149 for unlimited sites, all excluding tax. The price you pay at purchase stays your renewal price, even if list prices rise.
AIOSEO discounts the first year by half. Basic is $49.50 for the first year and $99 after that, for one site. Plus covers three sites. Five sites means Pro, which covers ten, at $199.50 for the first year and $399 normally.
Yoast SEO Premium is $118.80 a year, excluding VAT, and one subscription covers one site or domain. Five sites means five subscriptions, or $594 before the bulk discount Yoast mentions without giving a rate. The product page doesn't state a renewal price.
Over three years on a single site, SEOPress comes to $147 and AIOSEO Basic to $247.50.
What each plugin includes
Yoast Premium adds a redirect manager, internal linking suggestions and a report on orphaned content, and it now bundles the Local, Video and News SEO plugins. Every SEOPress PRO license has the same features, including a redirect manager with 404 monitoring, WooCommerce SEO, schema and white labeling. AIOSEO spreads features across tiers. Its FAQ says the internal link assistant and the deeper redirect tools start on Pro, and Search Statistics with keyword rank tracking is Elite only ($299.50 for the first year, $599 normally, 100 sites).
WordPress.com has its own rules
Plugins became available on every paid WordPress.com plan, starting with Personal, on April 2, 2026. Free sites still can't install them. WordPress.com says its sites are optimized for search by default and don't need plugins to be indexed. Installing an SEO plugin replaces the built-in SEO tools, and WordPress.com advises against running two SEO plugins with the same functions because they can conflict. A plugin-enabled site still sitting on the default .wpcomstaging.com address won't be indexed until it gets a custom domain or a custom robots.txt file.
Work out your own number: the SEO Tools Cost Calculator finds the cheapest published plan for your sites, tracked keywords and users.
Sources
Figures come from each vendor's own pricing pages and documentation. We have not tested these tools hands-on, and no ranking here is paid for.