Does Postmatic work well with Jetpack Commenting?
While two plug-ins are technically compatible (as they both use native commenting) there is a major drawback to using Jetpack commenting while running Postmatic.
Users cannot subscribe
Jetpack Comments does not offer your web users the ability to subscribe to the conversation via Postmatic. Therefore we do not recommend it.
See our article on conflicting plugins for more information. You can find it here.