Cart Conversion Boost helps you increase your checkout conversion rate by passing the customer’s name and email from your opt-in form into your ThriveCart checkout page *. It works with:

Thrive Themes opt-in forms (Thrive Architect and Thrive Leads, including 2-step lightbox opt-ins)
Kit (formerly ConvertKit) forms on your WordPress site (Kit’s embedded forms, the Kit plugin’s Form block, and the Kit plugin’s Form Builder block)
Elementor Pro forms and popups
Any other opt-in form or page builder – Flodesk, MailerLite, Mailchimp, Brevo, HubSpot, Contact Form 7, WPForms, Fluent Forms, Gravity Forms, Divi, Beaver Builder, Bricks and hand-written HTML forms – as long as the form sits on your page (not inside an iframe) and sends people to your CartConversionBoost URL

Take the customer details before they get to the shopping cart, so you can follow up, and convert more to completed sale, in case of cart abandonment.

When a visitor signs up through your opt-in form, this plugin ensures their name and email address are automatically pre-filled on the ThriveCart payment page – reducing friction and improving the user experience.

The free version has every feature, for one product:

One product – one CartConversionBoost URL for one ThriveCart product. Its checkout can be on thrivecart.com, on your own checkout domain (for example pay.yourdomain.com), or embedded on one of your pages
Auto-fill your Buy links – on your pages, links to your product’s ThriveCart checkout or to your CartConversionBoost URL get the visitor’s details added automatically, so a 3-step funnel (opt-in, sales page, checkout) needs no special links
Sitewide Identity Persistence – remember the visitor across every page of your site for the rest of their visit, so the Buy button on any page opens a pre-filled checkout
Opt-in pre-fill – fill your Thrive and Kit opt-in forms for visitors you already know (for example from a link in your emails), so it’s one click to continue
Silent opt-in – in a 3-step funnel, when a visitor you already know clicks a Buy button that opens a pop-up opt-in (Thrive Architect lightbox, Thrive Leads 2-step lightbox, Kit modal form or Elementor Pro popup), the pop-up is not shown. Its form is filled in and submitted for them behind the scenes, so they still join your list for that form (for example your cart-abandonment list), and the next thing they see is the pre-filled checkout
Embedded and popup checkouts – your product’s ThriveCart checkout embedded on your own page is pre-filled too

Cart Conversion Boost Pro is the same plugin with unlimited products.

Disclaimer – Cart Conversion Boost is an independent plugin and is not affiliated with or endorsed by Thrive Themes, Kit or ThriveCart.

Video Overview

Watch how Cart Conversion Boost works in under 2 minutes:

Screenshots

The plugin interface screenshot-1.jpg
Paste your CartConversionBoost URL into your ThriveThemes optin form as the “Target URL”. Make sure to tick/check the “Send form values” field.
Customer enters their name and email in the pre-sale opt-in
Your ThriveCart checkout is automatically pre-filled with their name and email already, helping conversion to sale. No repeated typing.

🚀 Key Benefits

Improve conversion rates
Reduced cart abandonment
Capture the lead before the payment page
Pre-fill ThriveCart checkout fields automatically
Reduce friction during checkout – Faster checkout experience
Simple setup inside WordPress admin
Lightweight and performance-friendly
NoCode interface

A smoother checkout experience often leads to higher completion rates and better user experience.

Why This Matters

Every extra step in a checkout process increases the chance that a customer abandons their purchase.

When customers must re-enter information they already provided, it introduces:

Friction
Delay
Drop-off risk

Cart Conversion Boost removes this friction by connecting your opt-in form and your ThriveCart checkout.

🔗 How It Works

A visitor completes your Thrive Themes or Kit opt-in form, which captures their name and email and sends them to your email provider
The CartConversionBoost plugin passes the name and email into the correct format for ThriveCart
The visitor is redirected to your ThriveCart product checkout page
ThriveCart checkout fields are automatically pre-filled
With Sitewide Identity Persistence on, the Buy links for your product are pre-filled for the rest of their visit too
Customer completes purchase faster

No complex setup, integrations or third-party connectors required.

Not affiliated with or provided by Thrive Themes, Kit or ThriveCart. This is a 3rd-party bridging tool. Thrive Themes, Kit and ThriveCart are trademarks of their respective owners. Cart Conversion Boost is an independent product and is not affiliated with, endorsed by, or sponsored by Thrive Themes, Kit or ThriveCart.

First Name, Last Name and Full Name

Opt-in forms and checkouts ask for names in different ways, and Cart Conversion Boost handles each of them:

Opt-in asks for a full name (Thrive Themes default): the full name is sent, and also split into first name (the first word) and last name (the rest). “Mary Ann Smith” becomes Mary / Ann Smith, which the buyer can edit if needed.
Opt-in asks for a first name only (Kit default): the first name is sent. No last name is guessed – if your checkout asks for one, the buyer types it.
Opt-in asks for first name and last name separately: both are sent exactly as entered, with no splitting, and the full name is the two joined together. In Kit, add a custom field with the key last_name. In Thrive, add a field named last_name.
Opt-in asks for email only: just the email is sent.

On the ThriveCart side, whether your checkout shows one “full name” box or separate first and last name boxes, the right boxes are filled, because the full name, first name and last name are all sent (whenever they are known).

Key Features

Automatically pass name and email to ThriveCart
Works with Thrive Themes, Kit (ConvertKit), Elementor, Flodesk and any other opt-in form or page builder on your page
Handles full name, first name and last name fields
Works with ThriveCart hosted, embedded and popup checkouts
Lightweight and fast
No external dependencies (just your opt-in form and ThriveCart)
No tracking or analytics
Simple setup
No cookies, and nothing is stored on your server
GDPR-friendly approach

Privacy, Cookies and Browser Storage

Cart Conversion Boost does not set any cookies, stores nothing on your server, and does not send visitor data to us or to any third party.

To pre-fill checkouts after a Kit form or another on-page opt-in form, and across pages with Sitewide Identity Persistence, the visitor’s name and email are kept in the browser’s session storage (sessionStorage). This browser session storage:

stays in the visitor’s own browser and is never sent to us or shared with any third party
can only be read by your own website
is cleared when the visitor closes the browser tab or window
is never used for tracking, analytics or advertising

One exception: when a sign-up form opens a new browser tab (Mailchimp’s standard embed code does this), session storage cannot reach the new tab. For that case only, the name and email are also kept in the browser’s local storage for up to two minutes, and deleted as soon as the new tab has picked them up (or when the two minutes are up).

In URL Mode (Sitewide Identity Persistence off), nothing is kept for Thrive Themes opt-ins (the details travel in the redirect URL), and details from a Kit form or another on-page form are removed from session storage as soon as the checkout link has used them. The Kit plugin’s Form Builder block submits through WordPress, so for that block the details are passed in the redirect URL, just like Thrive.

With the Silent opt-in, when a visitor you already know clicks your Buy button, the details they have already given are submitted to your own pop-up opt-in form for them, exactly as if they had pressed its button. The form sends them to your email provider as it normally does. The plugin never ticks a consent box or answers a captcha for a visitor: a form with either is always shown.

A note on privacy law: UK and EU rules (PECR and the ePrivacy Directive) cover any storage of information on a visitor’s device, not only cookies. They exempt storage that is strictly necessary to provide a service the visitor has asked for. Cart Conversion Boost only keeps details the visitor has just typed into your opt-in form (or that arrived in a link you sent them), and only uses them to pre-fill your forms and checkout for that visitor during their visit, so we believe this falls within the “strictly necessary” exemption. You remain responsible for your own website’s privacy policy, and we recommend mentioning this pre-fill feature there. This is not legal advice.

Use Cases

Cart Conversion Boost is useful for:

Free-plus-shipping offers
Course creators
Digital product sellers
Membership sites
Service providers
Marketing funnels
Lead magnet funnels

Any funnel using a Thrive Themes or Kit opt-in followed by a ThriveCart checkout can benefit.

Requirements

WordPress
Thrive Themes (Thrive Architect or Thrive Leads), or Kit (ConvertKit) forms on your WordPress site
ThriveCart account (Basic or Pro)

Silent Opt-in

Use this with a 3-step funnel: squeeze page opt-in, then sales page, then checkout, where the Buy button on your sales page opens a pop-up opt-in (so that only people who click Buy join your cart-abandonment list). It works with a Thrive Architect lightbox, a Thrive Leads 2-step lightbox (ThriveBox), a Kit (ConvertKit) modal form opened by a link or button, and an Elementor Pro popup opened by a button.

When Cart Conversion Boost already knows the visitor’s name and email, the pop-up would only ask for details they have just given. So it is not shown. The pop-up form is filled in and submitted for them, Thrive Themes or Kit adds them to the list for that form and redirects as usual, and the next thing they see is the pre-filled checkout. While the checkout loads, the Buy button shows a short message (“One moment – taking you to your order…”), which you can change in the settings.

The pop-up is shown as normal (pre-filled where possible) when:

the visitor is not known yet
the pop-up form does not lead to your checkout, or (for Thrive forms) “Send form values” is not ticked
the form has a tick box (for example a consent box), a captcha, a drop-down, or a required field that cannot be filled from the visitor’s name and email – the plugin never answers these for a visitor
Thrive Themes, Kit or Elementor rejects a value, or the hidden submit has not gone through after 12 seconds

Important: the pop-up form’s Target URL (Thrive), redirect address (Kit) or Redirect (Elementor) must be your Cart Conversion Boost URL, or the cart will not be pre-filled.

Kit pop-up forms that open on a timer, on scroll or on exit are shown as normal, as are Thrive Leads boxes that open on exit. You can switch the feature off on the settings page.

License

This plugin is licensed under the GPLv2 or later.

Additional Notes

If you are using the Pro version of Cart Conversion Boost, please deactivate and delete it before activating this free version to avoid conflicts.