WordPress plugin comparison
Hydrogen SEO vs Slim SEO
At a glance
- Slim SEO has more active installs: 70K+, against fewer than 10 for Hydrogen SEO.
- On a typical day, Slim SEO is downloaded about 1,322 times, Hydrogen SEO about 4.
- Hydrogen SEO has no reviews yet.
- Slim SEO was updated more recently: Nov 5, 2026, against Oct 14, 2026 for Hydrogen SEO.
- Both are tested up to WordPress 7.1.4.
- Slim SEO has been around longer: since 2018, against 2026 for Hydrogen SEO.
Line by line
Slim SEO leads on 5 of 5 comparable lines.
| Metric |  Hydrogen SEO |  Slim SEO |
|---|---|---|
| Popular rank | #61,014 | #579 |
| Active installs | Fewer than 10 | 70K+ |
| Downloads, last 30 days | 220 | 137K |
| Rating | No ratings | 4.7(136) |
| Support threads resolved | – | 40% |
| Tested up to | 7.1.4 | 7.1.4 |
| Search multiplier | ×0.05 | ×1.42 |
| Last release | 27 days ago | 6 days ago |
| Requires PHP | 7.4 | 7.4 |
From WordPress.org's public data, refreshed every night. Downloads are WordPress.org's official daily figures for the last 30 days.
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