erellsworth

Just use Contact Form 7’s normal shortcodes like so:
‘[email* your-email]’ 
‘[checkbox sendinblue-opt-in default:1 “Subscribe” ]’ 
‘[hidden sendinblue-list-id “13”]’
That’s all there is to it.

Contact Form 7 SendInBlue Opt-in Checkbox

Not working

It integrates the form with Send In Blue very well. =)

but if we are using the official SendinBlue plugin, they seem to conflict and the officil plugin stops working.

It is a very useful plugin.

WordPress plugin to add a SendinBlue Opt-in checkbox for Contact Form 7

Alec Rust

Improve and simplify your marketing automation by connecting WooCommerce purchases to <a href="https://www.brevo.com/" rel="nofollow ugc">Brevo</a>.
Set default Brevo lists that customers are added to when they buy a product, and/or set lists for specific products.
This plugin can help with Brevo automations by reliably adding customers to Brevo lists based on the products they purchase.
Features include:
<ul>
<li>Add customers to specific Brevo lists based on products they buy</li>
<li>Add customers to default Brevo lists when they buy any product</li>
<li>Select when during checkout the customer is added to Brevo</li>
<li>Contacts created in Brevo include <a href="https://help.brevo.com/hc/en-us/articles/10635646979218-Create-and-manage-transactional-attributes" rel="nofollow ugc">transactional attributes</a></li>
<li>Optional logging included to help debug any issues</li>
</ul>
This plugin is not affiliated with Brevo. It’s open source, and contributions are welcome <a href="https://github.com/AlecRust/brevwoo" rel="nofollow ugc">on GitHub</a>.

BrevWoo

Add WooCommerce customers to Brevo the simple way.

Contact Form 7 SendInBlue Opt-in Checkbox vs BrevWoo