Pick the platform, then the plugin
Most “best form plugin” articles compare features. That is the wrong order if you already know which email platform you use, because support varies enormously by platform and a plugin that wins on features may not connect to your tool at all.
So these seven comparisons are organised by platform. Each answers the same question: which WordPress form plugins reach this one, and what does each cost you.
The seven
- Best form builders with Mailchimp integration: the widest support of any platform, so you can choose on features
- Best form builders with Klaviyo integration: only two of the ten largest plugins name it
- Best form builders with Brevo integration: six connect, and half still call it Sendinblue
- Best form builders with Kit integration: five connect, most still call it ConvertKit
- Best form builders with MailerLite integration: five connect, and MailerLite’s own rules are the usual blocker
- Best form builders with ActiveCampaign integration: seven connect, the second-best supported platform
- Best form builders with HubSpot integration: seven connect, and HubSpot also ships its own plugin
How these were put together
Every install count, rating and rating count comes from the WordPress.org plugin API, read on 29 August 2026. Whether a plugin supports a platform is taken from the plugin’s own readme, which is where vendors list what they connect to.
No prices are quoted anywhere in this set. They change, and a page carrying a stale price is worse than one carrying none. Each comparison links out to the vendor instead.
Ratings are shown with their rating count, because a 98 from 375 people and a 96 from 14,369 are not the same claim and the raw score hides that.
The one fact that runs through all seven
Contact Form 7 has ten million active installs and connects to nothing. Not Mailchimp, not any of them. That is deliberate: it builds and sends forms and leaves integrations to add-ons.
It is also why ClickSyncr exists, and why every one of these pages ends up making the same distinction. If you already have forms, add a connector. If you are starting fresh and happy inside one vendor’s ecosystem, buy their tier and keep the moving parts down.