These connections ship inside WP Sync core, so every licensed customer has all of them without buying a pack. Counted from the plugin source at version 1.0.140 there are 39 built in autoresponder apps. AWeber appears as two connection cards, so the Connections tab shows 40 cards in total.
The full list:
- ActiveCampaign, Acumbamail, AWeber Developer OAuth, AWeber Legacy, beehiiv, BirdSend, Brevo, Campaign Monitor, ConvertKit or Kit, Customer.io
- Drip, eMailChef, EmailOctopus, Encharge, Flodesk, FluentCRM, GetResponse, GoHighLevel, HubSpot, Keap or Infusionsoft
- Klaviyo, Loops, Mailchimp, MailerLite, Mailjet, MailPoet, Mailvio, MailWizz, Mautic, Moosend
- Omnisend, Ortto, ResultsAiX Mailer, Sender.net, SendFox, Sendiio, SendX, Sendy, Systeme.io, VBOUT
Which ones can be a source:
36 of the 40 cards can read new contacts and therefore act as a source. The four that are destination only are AWeber Legacy, Customer.io, Mailjet and SendFox. All 40 can act as a destination.
Instant push autoresponders:
Fourteen of the built in connections deliver new contacts to your site the moment somebody subscribes, rather than waiting for the poll: Acumbamail, Brevo, Drip, Encharge, Flodesk, Loops, MailPoet, Mautic, Moosend, Ortto, Sender.net, Sendiio, SendX and Sendy.
Stable connections:
Every built in connection is now marked stable. Where a card does carry a beta badge, it means fully functional but possibly needing small tweaks on unusual account setups.
Two connections that run on your own servers or site:
Mautic is a self hosted marketing automation platform that works both ways. ResultsAiX Mailer runs on the same WordPress site, so there is no API key at all. Both are covered in their own article.
A note on AWeber:
AWeber appears twice because there are genuinely two connection methods. Use AWeber Developer OAuth if you want AWeber to be a source. AWeber Legacy is intentionally destination only. This roster grows between releases, so the Connections tab and the in plugin Training tab always show the exact set for the version you have installed.