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 441 websites that are Gravity Forms Prevent Duplicates Customers. We know of 129 live websites using Gravity Forms Prevent Duplicates and an additional 312 sites that used Gravity Forms Prevent Duplicates historically and 78 websites in the United States.
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Get a list of 441 websites using Gravity Forms Prevent Duplicates which includes location information, hosting data, contact details, 129 currently live websites and an additional 313 domains that redirect to sites in this list. 312 sites that used this technology previouslyand 78 websites in the United States currently using Gravity Forms Prevent Duplicates.
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