API Fortress
Hoppscotch
HttpMaster
Request inspector
CurlHub.io
Advanced REST Client (ARC)
MockServer
Assertible
Return Path
Litmus
Email on Acid
MailChimp
250ok
Brevo
Sparkpost
Constant Contact
API Fortress is recommended for development teams looking for an end-to-end API testing platform, particularly those working in environments that require continuous integration and delivery. It's also well-suited for businesses of varying sizes that need reliable API monitoring and performance insights.
Hoppscotch - Open source API development ecosystem
Litmus - litmus tests and tracks your email campaigns, so you can always put your best design forward.
HttpMaster - HttpMaster is a professional software tool for testing and debugging HTTP applications, primarily aimed at REST API applications and web services.
Email on Acid - We make the send button safer. For every campaign, every message, and every inbox, Email on Acid has the time-saving tools you need to put your best email forward.
Request inspector - Debug web hooks, http clients
MailChimp - MailChimp is the best way to design, send, and share email newsletters.