Travis CI and Circle CI push code to a staging or production environment. So you still need to setup a full-stack environment to do end-to-end testing.
Runnable let's you have end-to-end (full-stack) environments with every branch. The minute a branch comes up, you have an environment. This includes a clone of your database
Runnable let's you have end-to-end (full-stack) environments with every branch. The minute a branch comes up, you have an environment. This includes a clone of your database