Hello Bar Popup Builder vs Mailster
Compare WordPress plugins and tools side by side. Pick products with “Compare” in the software directory.
| Feature | Hello Bar Popup Builder v1.5.3 · checked 23 Oct 2026 Free · ★ 1.6/5 Visit Details | Mailster v2.0.3 · checked 23 Oct 2026 Paid · ★ 3.5/5 Visit Details |
|---|---|---|
| At a glance | ||
| Active installs | 3,000+ | 7,000+ |
| Last updated | June 4, 2026 | October 15, 2026 |
| Editions | Hello Bar Popup Builder | Mailster Compatibility Tester · Mailster ($) |
| Pros | Adds Hello Bar popups with a site code and little setup; Loads the script in the head or the footer, chosen in settings; Plugin code is small with no local tracking | Server, PHP and mail checks in one admin page; Clear pass, warning or error result for each check; Free to run before buying Mailster |
| Cons | Popup content, analytics and data live on the Hello Bar service; Needs a Hello Bar account and site code to work; Popup behaviour cannot be changed in the plugin itself | Offers a Mailster licence purchase on the same page; Downloads the paid Mailster plugin after checkout; Only checks readiness, it is not the newsletter plugin |
| Mentioned in our posts | — | 2 |
| More features | ||
| Other features | Hello Bar site code and API key settings, Loads Hello Bar script in head or footer, Hello Bar popup script from the service, Admin options page | Server and PHP compatibility checks, Mail delivery check through wp_mail, Admin page for running tests, Mailster licence checkout and download ($) |
| Integrations | ||
| Payment | — | Freemius checkout |
| Marketing | Hello Bar | — |
| Plugins | — | Mailster download endpoint |
| Requires WordPress | 5.0 | 6.0 |
| Requires PHP | 7.4 | 7.4 |
| Tested up to | 7.0 | 7.1 |
| Phones home | No | No |
| External services | my.hellobar.com | mailster.co |