Byteplant Address Validator vs PostalUp

Byteplant Address Validator checks postal addresses against reference data to assess deliverability and suggest corrections. It checks street, house number, postal code, and city combinations for validity and formatting, with coverage across more than 240 countries and territories. Its APIs provide autocomplete suggestions from freeform searches, geocoding, duplicate identification, and asynchronous bulk verification for up to 100,000 addresses in one request. Rooftop-accurate coordinates are available when geocoding is enabled. A free account includes 100 checks and corrections without payment details or an automatic subscription, and a free trial is listed. Credits purchased through pay-as-you-go do not expire; monthly subscriptions add credits automatically and unused credits roll over. Address checks use 1.0, 2.5, or 5.0 credits according to region, with additional credits for geocoding. Integrations include Zapier, plugins for WordPress, jQuery, and Node.js, plus CRM and e-commerce systems. Byteplant says data stays in the EU and personally identifiable end-user information is deleted within 14 days. It states a 99.9% availability guarantee and typical API responses within 125 milliseconds. The service cannot determine whether a person has moved; an existing former address may still validate.

PostalUp provides ZIP code databases and an address validation API for U.S. address data. The API supports standardization, verification, geocoding, and bulk processing; PostalUp says its address API uses USPS data refreshed monthly. Submitted addresses are processed in real time and are not permanently stored except as needed to provide the service or as permitted by the Privacy Policy. Developers can use API documentation, code examples, a playground, webhooks, and a Postman collection, with examples or options for JavaScript, Python, PHP, Ruby, cURL, Go, and Java. An OpenAPI specification is also available. Database downloads vary by product and include CSV, JSON, Parquet, GeoJSON, and Shapefile formats; listed data sources include USPS, Census, OMB, HUD, and TIGER. Use cases include e-commerce, real estate, logistics, marketing, insurance, and healthcare. The free API plan includes 1,000 requests and basic validation. Paid API plans start at $29 a month; separate database plans are annual, starting at $19 a year for ZIP Code Database Basic. Internal commercial use is included with downloads, but redistribution to customers requires a redistribution license.