Software Alternatives & Startups

Jackmail VS SlimPress.dev

Compare Jackmail VS SlimPress.dev and see what are their differences

Jackmail

A newsletter plugin for Wordpress.

Rating
0 reviews
SlimPress.dev

Switch off the WordPress features your site doesn't use

Rating
0 reviews
Pricing
Open source Free Free trial

Which is more popular?

Tool popularity
100% vs 0%
alternatives listed
41 vs 9

Base details

Website, pricing, platforms and company facts side by side.

Jackmail
SlimPress.dev
Website jackmail.com pluginlab.dev
Pricing
Open source Free Free trial
Platforms —
Wordpress
Company — 2026
Listed in

About Jackmail and SlimPress.dev

In their own words, as submitted to SaaSHub.

Jackmail
SlimPress.dev

No description of Jackmail yet.

SlimPress turns off parts of WordPress core that your site does not use: XML-RPC, Heartbeat, emoji scripts, comments, feeds, archives, revisions, image sizes, dashboard clutter and more, grouped by area and explained in plain language. Every switch carries a "what might break" note and...

Read more about SlimPress.dev

Features and specs

What each product offers, as listed by its team.

Jackmail 5 features
SlimPress.dev 7 features
  • Integration with WordPress
    Jackmail integrates directly with WordPress, making it convenient for users managing their websites on this platform. It allows you to manage everything from within your WordPress dashboard, streamlining the email marketing process.
  • Automation Features
    Jackmail offers automatic newsletter creation based on WordPress processes, like new posts or product additions. This helps save time for users who regularly publish content.
  • Built-in SMTP Server
    The service includes a built-in SMTP server to ensure high deliverability rates, which can alleviate the need for third-party SMTP services.
  • Drag-and-Drop Editor
    Jackmail has an intuitive drag-and-drop editor, which makes creating emails easy even for users with no technical skills.
  • Analytics and Reporting
    The platform provides comprehensive analytics and reporting tools, allowing users to track the success of their email campaigns with metrics like open rates, click rates, and more.

Possible disadvantages

  • Limited to WordPress Users
    Jackmail is primarily designed for WordPress sites, which limits its use for businesses or individuals using other platforms or needing multi-platform integration.
  • Potential Learning Curve
    Users unfamiliar with WordPress or email marketing tools may experience a learning curve when starting with Jackmail's features.
  • Cost Considerations
    While offering a range of features, Jackmail may have cost considerations depending on the size of your email list and the frequency of campaigns, as it charges based on usage.
  • Dependency on WordPress for Features
    Many of Jackmail’s functionalities are tied to its WordPress integration, potentially reducing flexibility for users who want to switch platforms.
  • Feature Limitations Compared to Dedicated Email Marketing Tools
    Jackmail, while offering convenient integration, might have fewer advanced features compared to standalone email marketing tools like Mailchimp or Constant Contact.
  • Switches in 13 groups
    Front-end, APIs, comments, content, revisions, media, block editor, dashboard, updates, emails, security, Site Health and WooCommerce, each switch in plain language.
  • "What might break" on every switch
    an impact badge and a warning if an active plugin relies on the feature.
  • Undo for every change
    the last 10 versions of its settings are kept, and any save, preset, import or reset can be restored.
  • Built-in performance test
    compares your pages with and without SlimPress, and says "within noise" when the difference is too small to trust.
  • Assets tab
    load a plugin's CSS and JavaScript only on the pages that use it, with a plugin scan showing the size each one adds.
  • Presets
    Safe defaults, Blog, Brochure site, WooCommerce store and Headless.
  • Nothing until you switch it
    no code or hooks load for features that are off, there's no pro tier or telemetry, and deactivating it restores WordPress's defaults.

Videos

Walkthroughs and reviews on video.

Jackmail 3 videos + Add
SlimPress.dev 0 videos + Add

Jackmail WCEU Review

More videos

  • - What is Jackmail, The WordPress Newsletter Plugin?
  • - How to create your first newsletter with Jackmail and WordPress?

No SlimPress.dev videos yet. You could help us improve this page by suggesting one.

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
Jackmail
SlimPress.dev
100% 100%
0% 0%
80% 80%
20% 20%
0% 0%
100% 100%
100% 100%
0% 0%

Questions & Answers

As answered by people managing Jackmail and SlimPress.dev.

What makes your product unique?

SlimPress.dev's answer:

Every switch says what it might break, and SlimPress warns you if an active plugin relies on the feature you're about to turn off. Any change can be undone from the last 10 saved versions of its settings. A built-in performance test loads your own pages with and without SlimPress and says "within noise" when the difference is too small to trust, instead of overselling. Every toggle is free: no pro tier, no upsells, no telemetry.

How would you describe the primary audience of your product?

SlimPress.dev's answer:

WordPress site owners, freelancers and agencies who want a leaner site and want to understand each change before making it. It suits blogs, brochure sites and WooCommerce stores, and includes presets for each (Safe defaults, Blog, Brochure site, WooCommerce store and Headless).

What's the story behind your product?

SlimPress.dev's answer:

I built SlimPress because on shop sites I kept switching off the same parts of WordPress core by hand, and I wanted each switch to say what it might break. It grew into a plugin with grouped switches, an undo history and a performance test that reports the real difference on your own pages. I publish it free, with no pro version, as part of PluginLab.dev.

Which are the primary technologies used for building your product?

SlimPress.dev's answer:

PHP and JavaScript for WordPress, written as plain, readable source with no build step. It requires WordPress 6.8 or higher and PHP 7.4 or higher, and applies its changes through WordPress filters and actions at runtime. An optional PageSpeed button calls Google's PageSpeed Insights API only when you click it. It also integrates with WooCommerce when WooCommerce is active.

Who are some of the biggest customers of your product?

SlimPress.dev's answer:

SlimPress is free and open source, so it has no paying customers. It is installed from WordPress.org by site owners, agencies and WooCommerce shops, and it has no telemetry, so I don't track or name them.

Why should a person choose your product over its competitors?

SlimPress.dev's answer:

It focuses on one job: turning off parts of WordPress core your site doesn't use, and it is open about what each change costs. Nothing is switched off until you choose to, and deactivating SlimPress puts WordPress back exactly as it was, because every switch is a runtime filter. It adds no CSS, JavaScript or markup to your pages, and it deliberately skips caching, minification and CDN rewrites, so it works alongside the performance tools you already use.

User comments

Share your experience with using Jackmail and SlimPress.dev. For example, how are they different and which one is better?

Log in or Post with

Alternatives to Jackmail and SlimPress.dev

When comparing Jackmail and SlimPress.dev, you can also consider the following products.