MerPress

54 Quality Score

Active Installs

14/30

About 1,000 active installs puts MerPress in niche territory, so the word-of-mouth and install-base signals are weak compared to mainstream block plugins.

Update Freshness

13/25

An update in August 2025 and tested against WordPress 6.7.5 show the developer is keeping up with recent core releases.

User Rating

12/15

A perfect 100 score from only 3 ratings is statistically thin and should not be treated as a strong endorsement yet.

Support Health

8/15

The single support thread with a 0% resolution rate is a yellow flag, although the sample size is too small to declare the developer unresponsive.

WP Compatibility

8/15

Requiring only WordPress 4.6 and PHP 7.2 means it will run on virtually any modern install, but no information about multisite or block theme compatibility limits confidence.

Scores higher than 5% of indexed plugins

About

Merpress lets you create diagrams and visualizations using MermaidJS.

Active Installs 1k+

Rating ★★★★★ 5/5

Last Updated 2025-08-04 7:05pm GMT

Requires WordPress 4.6+

Tested Up To 6.7.9

Requires PHP 7.2+

✓ No known vulnerabilities

What It Does

MerPress is a WordPress block plugin that lets you author MermaidJS diagrams directly inside the block editor, so flowcharts, sequence diagrams, and other visualizations render on the front end without leaving the post or page workflow. It handles the Mermaid script loading and renders the markup inline, sparing you from shortcodes or external embeds.

Who It's For

This plugin fits technical writers, software teams, and educators who regularly publish flowcharts, architecture diagrams, or process visuals on a WordPress site and want a Gutenberg-native way to do it. It is best suited to sites where Mermaid diagrams are a recurring content need rather than a one-off.

Who Should Skip It

If you only need a single diagram or post it online once, an external Mermaid editor plus a screenshot will be faster and avoid adding a plugin. Sites on heavily locked-down hosts that block third-party script loading may also struggle to render the diagrams.

The Bottom Line

MerPress does one job, embedding MermaidJS diagrams as a block, and it does so on current WordPress with a sensible minimum PHP version. The overall quality score of 54.97/100 reflects real concerns: a tiny install base, only 3 ratings, and an unanswered support thread. Use it if Mermaid is central to your publishing, but test rendering on your theme and host before committing.

Pick Spectra if you need Mermaid alongside dozens of other design blocks and want a million-plus install track record.

WP Popular Posts 89/100

Choose this when your real priority is surfacing popular content rather than embedding diagrams.

Breadcrumb NavXT 88/100

Reach for it if you need reliable site navigation breadcrumbs instead of visual content tools.

PDF Embedder 86/100

Go with PDF Embedder when your diagrams live in PDFs or slide decks rather than as live editable markup.

GenerateBlocks 86/100

Pick GenerateBlocks if you want a lightweight block toolkit for layout and typography and can add Mermaid via a separate snippet or child plugin.

Use Cases

technical documentation sites software development blogs API documentation developer tutorials data visualization blogs system architecture diagrams workflow automation guides technical training platforms software engineering portfolios database schema documentation