PluginSift

Unique Headers vs AcyMailing – Custom headers in emails (2026)

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

Unique Headers

Unique Headers

4.9(160)

20K+ active installs

Free

Updated 2 years ago
View Unique Headers
VS
AcyMailing – Custom headers in emails

AcyMailing – Custom headers in emails

0(0)

30 active installs

Free

Updated 1 month ago
View AcyMailing – Custom headers in emails

Quick Verdict

As of April 2026, Unique Headers has a higher user rating (4.9/5 from 160 reviews) and leads in active installations (20K+ vs 30). Both are free WordPress plugins. Unique Headers has accumulated 414K+ total downloads while AcyMailing – Custom headers in emails has 6.6K+.

Detailed Comparison

Rating
4.9/5Unique Headers
◄
AcyMailing – Custom headers in emailsN/A
Total Reviews
160Unique Headers
◄
AcyMailing – Custom headers in emails0
Active Installs
20K+Unique Headers
◄
AcyMailing – Custom headers in emails30
Total Downloads
414K+Unique Headers
◄
AcyMailing – Custom headers in emails6.6K+
Support Resolution
N/AUnique Headers
AcyMailing – Custom headers in emailsN/A
Last Updated
2 years agoUnique Headers
►
AcyMailing – Custom headers in emails1 month ago
First Released
2012Unique Headers
AcyMailing – Custom headers in emails2021
Age
14 yearsUnique Headers
AcyMailing – Custom headers in emails5 years
WP Requires
4.3+Unique Headers
AcyMailing – Custom headers in emailsfalse+
PHP Requires
false+Unique Headers
AcyMailing – Custom headers in emailsfalse+
Business Model
FreeUnique Headers
AcyMailing – Custom headers in emailsFree
Latest Version
1.9.3Unique Headers
AcyMailing – Custom headers in emails3.9

Rating Breakdown

Unique Headers

4.9/5(160 reviews)
5
97%
4
2%
3
1%
2
0%
1
1%

AcyMailing – Custom headers in emails

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

Recent Reviews

Unique Headers Reviews

by italliance

Simply Awesome

Super easy to use. Thank you for developing this.

by SSVapes

works perfectly

works perfectly. the shortcodes could be better

by laserulm

Great job!

thx

AcyMailing – Custom headers in emails Reviews

No reviews yet

Frequently Asked Questions

Is Unique Headers or AcyMailing – Custom headers in emails more popular?
Unique Headers has 20K+ active installations while AcyMailing – Custom headers in emails has 30. Unique Headers is the more widely-used plugin as of April 2026.
Which has better ratings — Unique Headers or AcyMailing – Custom headers in emails?
Unique Headers has a 4.9/5 rating from 160 reviews, while AcyMailing – Custom headers in emails has a 0/5 rating from 0 reviews.
Are Unique Headers and AcyMailing – Custom headers in emails free?
Unique Headers is free and AcyMailing – Custom headers in emails is free. Both can be downloaded from the WordPress.org plugin directory.
Which plugin has better support — Unique Headers or AcyMailing – Custom headers in emails?
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?
Unique Headers was last updated 2 years ago and AcyMailing – Custom headers in emails was last updated 1 month ago.

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