Simply prevent duplicate submissions by blocking the submit button while submitting.
https://wordpress.org/plugins/gf-prevent-duplicates/
Widgets · WordPress Plugins
Get access to data on 450 websites that are Gravity Forms Prevent Duplicates Customers. We know of 128 live websites using Gravity Forms Prevent Duplicates and an additional 322 sites that used Gravity Forms Prevent Duplicates historically and 78 websites in the United States.
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Get a list of 450 websites using Gravity Forms Prevent Duplicates which includes location information, hosting data, contact details, 128 currently live websites and an additional 312 domains that redirect to sites in this list. 322 sites that used this technology previouslyand 78 websites in the United States currently using Gravity Forms Prevent Duplicates.
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