Cloudmailin vs sendwithus: What are the differences?

What is Cloudmailin? Incoming Email for your Web App. CloudMailin allows you to receive any volume of incoming email via a Webhook. You are given an email address that will forward any incoming message to your app, as an HTTP POST, within milliseconds. You can also seamlessly check the delivery status of each of your incoming emails via the dashboard, bounce emails that you do not wish to receive and use your own domain name.

What is sendwithus? Email automation for developers + testing and analytics for marketers. Send email from your app with a simple API call, Sendwithus manages the rest. Templates, testing, data management, segments, and analytics are all accessible through a friendly dashboard.

Cloudmailin and sendwithus can be primarily classified as "Transactional Email" tools.

Some of the features offered by Cloudmailin are:

• Easily receive email in Ruby on Rails, PHP, .Net, Java, Django or any language/framework we forgot. Since the email is delivered as an HTTP Post it's simple.
• See the delivery status of the emails it has delivered to your app.
• No more polling or waiting for new processes to spawn. Email can arrive in as little as a few milliseconds.

On the other hand, sendwithus provides the following key features:

• A/B testing
• analytics
• click tracking