# Akismet Anti-spam: Spam P… vs Knowledge Building

> Akismet Anti-spam: Spam P… vs Knowledge Building compared on installs, downloads, ratings, updates, compatibility and support. Akismet Anti-spam: Spam Pro… comes out ahead, winning 6 of 7 head-to-head checks against Knowledge Building.

**Akismet Anti-spam: Spam Pro… comes out ahead, winning 6 of 7 head-to-head checks against Knowledge Building.** Choose Akismet Anti-spam: Spam Pro… if you care most about active installs, downloads (30 days) and reviews. Choose Knowledge Building if you care most about download trend.

| | Akismet Anti-spam: Spam Protection | Knowledge Building |
|---|---|---|
| Active installs | 5M+ ✅ | 10+ |
| Downloads (30 days) | 1.6M ✅ | 46 |
| Download trend | -82% | +24.3% ✅ |
| Rating | 4.7/5 | 5/5 |
| Reviews | 1,187 ✅ | 1 |
| Health score | 94/100 ✅ | 30/100 |
| Last updated | 1 month ago ✅ | 11 years ago |
| Tested up to | WP 7.1.2 ✅ | WP 4.3.34 |
| Support resolved | 100% | — |
| Requires PHP | 7.2+ | Any |
| First released | Oct 2005 | Sep 2009 |

## Frequently asked questions

### Which is better, Akismet Anti-spam: Spam Pro… or Knowledge Building?
Akismet Anti-spam: Spam Pro… comes out ahead, winning 6 of 7 head-to-head checks against Knowledge Building. Choose Akismet Anti-spam: Spam Pro… if you care most about active installs, downloads (30 days) and reviews. Choose Knowledge Building if you care most about download trend.

### Is Akismet Anti-spam: Spam Pro… more popular than Knowledge Building?
Akismet Anti-spam: Spam Pro… is the more popular of the two with 5M+ active installs, compared with 10+ for Knowledge Building.

### Can I use Akismet Anti-spam: Spam Pro… and Knowledge Building together?
Both plugins cover comments, so most sites only need one. Running two plugins that do the same job can cause conflicts and slow your site down — pick the one that fits best and remove the other.

### Are Akismet Anti-spam: Spam Pro… and Knowledge Building free?
Yes. Both are free to download from the official WordPress.org plugin directory. Either may also offer paid upgrades from its developer.


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