API Helper is jQuery free and has no external library dependencies — with a total payload of less than 2K.
"Use this app to simplify a front end newsletter sign up and integrates opt-in amongst other things. This was exactly what I needed and makes it so easy!! Amazing app, cannot recommend enough."
"We used this app to help for Klaviyo subscription. The code is very easy to use and saves time. Support's answer are very fast and useful."