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Once you activate this plugin and enter your Klaviyo API keys, it will automatically sync your WordPress user profiles with Klaviyo.
Each time a new profile is created or updated, an event it also recorded on the profile in Klaviyo.
The following properties are synchronized to Klaviyo as profile properties automatically
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<li>User ID: <code>wordpress_user_id</code>
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<li>User Registered Date: <code>wordpress_user_registered</code></li>
<li>User Login: <code>wordpress_user_login</code></li>
<li>User Role: <code>wordpress_user_role</code></li>
<li>User First Name</li>
<li>User Last Name</li>
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</ul>
A \”WordPress – Created User\” and \”WordPress – Updated User\” event is recorded when a user is created or updated.
By default this plugin will only synchronize users created or updated after the plugin was enabled. There is also a feature to allow you to manually sync all of your WordPress users as a once off activity.
Add Klaviyo Onsite Javascript 
This plugin includes a setting to automatically add the Klaviyo Javascript to your website. This is an optional setting, as you may have already added the Klaviyo Javascript via their official integration.

User Sync For Klaviyo

This plugin will automatically sync your users from WordPress to Klaviyo.  It will also optionally add the Klaviyo Javascript snippet to your WordPres …

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Kaisar Ahmmed

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This plug in allow you to add or subscribe users to Klaviyo’s list with gravity forms.
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Klaviyo offical website: https://www.klaviyo.com/
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To achieve this, the pluin using Klaviyo list’s API (you can read more here: https://developers.klaviyo.com/en/reference/api_overview)
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To use this plugin, you will need an API key provide by Klaviyo when using their services. That mean when using this pluign you are agree with Klaviyo’s Legal, Terms, & Policies here: https://www.klaviyo.com/legal
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Klaviyo for Gravity Forms

Klaviyo's list API integration for Gravity forms

User Sync For Klaviyo vs Klaviyo for Gravity Forms