PluginSift

Imsanity vs Slenderbox (2026)

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

Imsanity

Imsanity

4.9(291)

200K+ active installs

Free

Updated 1 month ago
View Imsanity
VS
Slenderbox

Slenderbox

4.6(10)

40 active installs

Free

Updated 7 years ago
View Slenderbox

Quick Verdict

As of April 2026, Imsanity has a higher user rating (4.9/5 from 291 reviews) and leads in active installations (200K+ vs 40). Both are free WordPress plugins. Imsanity has accumulated 4.5M+ total downloads while Slenderbox has 3.4K+.

Detailed Comparison

Rating
4.9/5Imsanity
◄
Slenderbox4.6/5
Total Reviews
291Imsanity
◄
Slenderbox10
Active Installs
200K+Imsanity
◄
Slenderbox40
Total Downloads
4.5M+Imsanity
◄
Slenderbox3.4K+
Support Resolution
50%Imsanity
SlenderboxN/A
Last Updated
1 month agoImsanity
◄
Slenderbox7 years ago
First Released
2011Imsanity
Slenderbox2012
Age
15 yearsImsanity
Slenderbox14 years
WP Requires
6.6+Imsanity
Slenderbox2.6+
PHP Requires
7.4+Imsanity
Slenderboxfalse+
Business Model
FreeImsanity
SlenderboxFree
Latest Version
2.9.0Imsanity
Slenderbox1.1.2

Rating Breakdown

Imsanity

4.9/5(291 reviews)
5
95%
4
3%
3
0%
2
1%
1
1%

Slenderbox

4.6/5(10 reviews)
5
70%
4
20%
3
10%
2
0%
1
0%

Recent Reviews

Imsanity Reviews

by robertgray

It works

It just works 🙂

by edgarro

The best!

Very, very useful.

by Topher

Perfect

This plugin does exactly what it says. It also works with WebP, so combined with Cimo you have a perfect scenario for a health media library.

Slenderbox Reviews

No reviews yet

Frequently Asked Questions

Is Imsanity or Slenderbox more popular?
Imsanity has 200K+ active installations while Slenderbox has 40. Imsanity is the more widely-used plugin as of April 2026.
Which has better ratings — Imsanity or Slenderbox?
Imsanity has a 4.9/5 rating from 291 reviews, while Slenderbox has a 4.6/5 rating from 10 reviews.
Are Imsanity and Slenderbox free?
Imsanity is free and Slenderbox is free. Both can be downloaded from the WordPress.org plugin directory.
Which plugin has better support — Imsanity or Slenderbox?
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?
Imsanity was last updated 1 month ago and Slenderbox was last updated 7 years ago.

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