PostGrid Address Verification vs ZAP~POST

PostGrid Address Verification checks, autocompletes, standardizes, and enriches addresses for delivery across the U.S., Canada, and 245+ countries and territories. It accepts structured fields, single-line freeform text, or incomplete entries and verifies against postal data in real time. Its international service supports CSV batches of up to one million addresses and can add geographic coordinates with rooftop-level accuracy. It supports non-Latin scripts including Chinese, Arabic, Japanese, and Korean, with conversion to standardized Roman scripts. Named integrations include Salesforce, Stripe, Dynamics 365, Shopify, and Zapier. Options include APIs and SDKs, a no-code dashboard, and self-hosting. Each verification, autocomplete, or standardization request counts as a lookup; monthly plans impose allowances and additional lookup charges beyond them. Standard Essential costs $18 a month billed yearly and includes 2,000 U.S. and Canada lookups monthly, with additional lookups at $0.02 each. Test API keys and 500 free lookup credits are available; a separate bulk verification service page describes 100 free lookups. The product page lists security and compliance provisions including HIPAA, PIPEDA, GDPR, SOC 2 Type 2, and PCI-DSS.

ZAP~POST sends personalized postcards and letters when a real-time event or customer action triggers a campaign. Its web design app supports drag-and-drop editing, custom fields, uploaded images, and unique promotional or QR codes. Mail formats include oversized and A5 postcards, an A5 one-piece mailer, and a secure letter. Campaigns can use recipient-specific QR codes and tracking, while conversion attribution is handled through the customer’s analytics platform. ZAP~POST validates recipient details and cleans records; rejected records may receive Zap credits under its credit rules. Ecommerce, CRM, and CDP systems can connect by API, and listed integrations include Klaviyo, Dotdigital, Ometria, HubSpot, Bloomreach, Zapier, Force24, and Shopify. The main standard mailing location is the UK, with campaigns also available in the US, Germany, the Netherlands, France, and Italy; specifications, prices, and turnaround vary by country. A one-off trial campaign is available without a credit card, and the site advises trying at least 1,000 recipients. The service is web-based and headquartered in London.