mdoff

It’s not a standalone plugin requires installed Contact Form 7
This plugin solves problem of e.g. email verification or email confirmation.
Just create second field with <code>_confirm</code> at the end of the field name. Look in the screenshots for example.

cf7 Confirm Field

Plugin allows to make sure that e.g. emails in two fields are the same

leadsnap

This is the official plugin for LeadSnap. This plugin creates the connection between WordPress and your LeadSnap account. Form submissions are instantly available and ready to leverage all the powerful features of our lead management system within the LeadSnap system. For more information on features, plans and more check out <a href="https://www.leadsnap.com/" rel="nofollow ugc">leadsnap.com</a>.

LeadSnap

Save the leads to our lead management system CRM generated by Contact Form 7

cf7 Confirm Field vs LeadSnap