Constant Contact Forms vs Mailster
Compare WordPress plugins and tools side by side. Pick products with “Compare” in the software directory.
| Feature | Constant Contact Forms v2.22.3 · checked 23 Oct 2026 Free + paid · ★ 2.6/5 Visit Details | Mailster v2.0.3 · checked 23 Oct 2026 Paid · ★ 3.5/5 Visit Details |
|---|---|---|
| At a glance | ||
| Active installs | 20,000+ | 7,000+ |
| Last updated | October 9, 2026 | October 15, 2026 |
| Editions | Constant Contact Forms for WordPress | Mailster Compatibility Tester · Mailster ($) |
| Pros | Forms feed directly into Constant Contact lists; Block and widget to place forms anywhere; Choice of reCAPTCHA, hCaptcha, Turnstile or Akismet | Server, PHP and mail checks in one admin page; Clear pass, warning or error result for each check; Free to run before buying Mailster |
| Cons | Requires a Constant Contact account to work; Submissions are sent to Constant Contact rather than stored locally; Limited to Constant Contact as the mailing service | Offers a Mailster licence purchase on the same page; Downloads the paid Mailster plugin after checkout; Only checks readiness, it is not the newsletter plugin |
| Mentioned in our posts | 1 | 2 |
| More features | ||
| Other features | Form builder stored as a custom post type, Constant Contact list selection, Gutenberg block for the contact form, Widget for placing a form in sidebars, Hourly refresh of the Constant Contact token | Server and PHP compatibility checks, Mail delivery check through wp_mail, Admin page for running tests, Mailster licence checkout and download ($) |
| Integrations | ||
| Payment | — | Freemius checkout |
| Constant Contact API | — | |
| Plugins | — | Mailster download endpoint |
| Other | Google reCAPTCHA, hCaptcha, Cloudflare Turnstile, Akismet | — |
| Requires WordPress | 6.4.0 | 6.0 |
| Requires PHP | 8.1 | 7.4 |
| Tested up to | 7.1.3 | 7.1 |
| Phones home | No | No |
| External services | www.google.com, api.wordpress.org, hcaptcha.com, challenges.cloudflare.com, api.cc.email | mailster.co |
| Blocks | 1 | — |