I've been using Google Tag manager a lot, and if you have a custom need you can't use Google Tag Manager without coding knowledge.
Using HockeyStack I was never in the need of having to code anything. Their "text selector" is a game changer for me.

If you want to watch my full review, you can see it here: https://www.youtube.com/watch?v=HfY-WhF6_jU

With the future ahead on their roadmap, I'm so excited to see how the bigger elements and modules will be developed in the future!