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 453 websites that are Gravity Forms Prevent Duplicates Customers. We know of 130 live websites using Gravity Forms Prevent Duplicates and an additional 323 sites that used Gravity Forms Prevent Duplicates historically and 78 websites in the United States.
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Get a list of 453 websites using Gravity Forms Prevent Duplicates which includes location information, hosting data, contact details, 130 currently live websites and an additional 368 domains that redirect to sites in this list. 323 sites that used this technology previouslyand 78 websites in the United States currently using Gravity Forms Prevent Duplicates.
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