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OptionProof
by VentureVD
Add product options and paid add-ons to your Shopify store, with add-on charges verified correct at checkout on every release. Free plan available.
—(0 reviews)· Free plan available. Free trial available.· Launched Oct 13, 2026
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Add product options and paid add-ons to your Shopify store, with add-on charges verified correct at checkout on every release. Free plan available.
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Data last refreshed Oct 20, 2026. Source: Shopify App Store.