Codefresh is a CI/CD tool designed for containers and Kubernetes. Codefresh features a GitLab integration that allows you to use GitLab for version control and run Codefresh pipelines on your code. Codefresh has some features that make it more mature than GitLab for running pipelines across multiple projects. But it lacks the benefits of a single application.
Codefresh charges for builds per month, as well as concurrent builds. GitLab has no such limitations with the ability to elastically scale Runners to handle as many concurrent builds as needed on demand and then scale down so you aren't paying to keep inactive Runners up.
Codefresh only offers a self-managed option for Enterprise pricing. Free, Basic, and Pro tiers are for SaaS-only. GitLab offers self-managed and SaaS options at every price point.