Hey @Akselpd,
Using third-party tools such as Zapier to integrate custom websites with Klaviyo has become ever more popular these days! Instead of leveraging a third-party, you also always have the option to create the custom integration yourself by using Klaviyo’s API.
One of the key differences between using a third-party tool versus developing your own connection is the difference in flexibility and types of data that gets shared. Often times, third-party tools can only pass certain amount of data between the two apps that are connected and typically don’t have any further customization capabilities. Whereas, if you’re developing your own connect, since it would be fully custom, you’ll have greater flexibility in the types of data that gets synced over.
In my opinion, no one option is better than the other and depend entirely on what your overall use case and goals would be. You may also want to take a look at our Developer Portal where we have various resources and guides on not only how to use our Klaviyo API but also connecting custom websites/platforms to Klaviyo.
I hope this helps!
David