More than 60% of all websites run on WordPress — and nearly every one uses an SEO plugin. The three big names have been the same for years: Yoast SEO, RankMath and AIOSEO (All in One SEO). At their core they do the same thing: set meta tags, generate XML sitemaps, emit schema markup, score snippets.
The honest truth: for 90% of all sites it barely matters which one you pick. The differences are in usability, bloat and price — not in "rankings".
The three big plugins at a glance
| Yoast SEO | RankMath | AIOSEO | |
|---|---|---|---|
| Market share | ~13M installs | ~3M installs | ~3M installs |
| Free version | Solid | Very extensive | Limited |
| Pro from | ~$99/year | ~$59/year | ~$49/year |
| UI impression | Clean, lots of upsell | Powerful, a bit cluttered | Classic |
| Performance impact | Medium | Medium to high | Medium |
Which plugin fits which site?
Yoast SEO
The safe choice for agencies, multi-user setups and anyone who doesn't want surprises. Yoast is conservative but reliable. More: Yoast SEO compared →
RankMath
Best free version on the market. Many features (redirects, 404 monitoring, schema types) that Yoast charges extra for. Ideal for tech-savvy solo operators. More: RankMath compared →
AIOSEO
The oldest SEO plugin around. Solid, no big surprises — and usually cheaper than Yoast Pro. More: AIOSEO compared →
Do you even need a classic SEO plugin?
Honest answer: yes, you need something — WordPress itself does too little out of the box. But the big three solve a problem most sites don't have (enterprise SEO with hundreds of options) and ignore what's actually missing: monitoring, reports and clear tasksinstead of red/green lights on every post.
That's exactly where SignalWP SEO comes in: not a snippet scorer, but a monitor that tells you what actually changed on your site and what to do next.
Things every SEO plugin must cover
- Title & meta description per post — see Meta description in WordPress
- XML sitemap auto-generated and submitted to Google
- Open Graph & Twitter Cards for social shares
- Schema markup (Organization, Article, FAQPage)
- Canonical tags against duplicate content
- Redirects for moved content (not every plugin can do this)
How to choose in 3 steps
- If you already use one — stick with it. Migrations are time sinks and the SEO gain is zero.
- New blog, no budget — RankMath Free. Best free version available.
- Agency / client site — Yoast Pro. Proven, well documented, no onboarding drama.
If after 3 months you notice your plugin doesn't tell you what to do — only what's possible — you're the typical use case for structured WordPress SEO optimization.
Go deeper
- Yoast SEO compared
Strengths, weaknesses, price and who Yoast is for.
- RankMath compared
The most powerful free version — with caveats.
- AIOSEO compared
The underrated classic. When it's the right choice.
- WordPress SEO optimization
What actually moves rankings — beyond plugins.
- Set the meta description
Step by step for every SEO plugin.