PluginSift

Autoptimize vs Kas Viewer (2026)

Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.

Autoptimize

Autoptimize

4.7(1,424)

900K+ active installs

Free

Updated 3 weeks ago
View Autoptimize
VS
Kas Viewer

Kas Viewer

5(1)

10 active installs

Free

Updated 16 years ago
View Kas Viewer

Quick Verdict

As of April 2026, Kas Viewer has a higher user rating (5/5 from 1 reviews) while Autoptimize leads in active installations (900K+ vs 10). Both are free WordPress plugins. Autoptimize has accumulated 43M+ total downloads while Kas Viewer has 3.8K+.

Detailed Comparison

Rating
4.7/5Autoptimize
►
Kas Viewer5/5
Total Reviews
1,424Autoptimize
◄
Kas Viewer1
Active Installs
900K+Autoptimize
◄
Kas Viewer10
Total Downloads
43M+Autoptimize
◄
Kas Viewer3.8K+
Support Resolution
40%Autoptimize
Kas ViewerN/A
Last Updated
3 weeks agoAutoptimize
◄
Kas Viewer16 years ago
First Released
2009Autoptimize
Kas Viewer2010
Age
17 yearsAutoptimize
Kas Viewer16 years
WP Requires
5.3+Autoptimize
Kas Viewerfalse+
PHP Requires
7.1+Autoptimize
Kas Viewerfalse+
Business Model
FreeAutoptimize
Kas ViewerFree
Latest Version
3.1.15Autoptimize
Kas Viewer1.0.2

Rating Breakdown

Autoptimize

4.7/5(1,424 reviews)
5
90%
4
2%
3
1%
2
1%
1
5%

Kas Viewer

5/5(1 reviews)
5
100%
4
0%
3
0%
2
0%
1
0%

Recent Reviews

Autoptimize Reviews

by uniqf0x

avoid

causes critical error, also no way to deactivate or remove without it crippling my wp site. don’t use it.

by kkrajk

Injects Malware.

Not one but this happened twice in about 6 months across 2 sites. This topic was modified 1 week, 6 days ago by kkrajk.

by davo342

Mala idea adquirir la versión PRO

Pague la versión PRO, y realmente fue un desastre, mi web tuvo constantes caídas, excesiva cantidad de cache, problemas con el CSS, realmente fue una perdida de dinero en el Plugin

Kas Viewer Reviews

No reviews yet

Frequently Asked Questions

Is Autoptimize or Kas Viewer more popular?
Autoptimize has 900K+ active installations while Kas Viewer has 10. Autoptimize is the more widely-used plugin as of April 2026.
Which has better ratings — Autoptimize or Kas Viewer?
Autoptimize has a 4.7/5 rating from 1,424 reviews, while Kas Viewer has a 5/5 rating from 1 reviews.
Are Autoptimize and Kas Viewer free?
Autoptimize is free and Kas Viewer is free. Both can be downloaded from the WordPress.org plugin directory.
Which plugin has better support — Autoptimize or Kas Viewer?
Support resolution data is not available for all plugins. Check each plugin's WordPress.org support forum for current response quality.
Which plugin is updated more frequently?
Autoptimize was last updated 3 weeks ago and Kas Viewer was last updated 16 years ago.

Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.