AddressZen vs PostalUp
AddressZen
addresszen.comPostalUp
postalup.comSide by side
| Figure | AddressZen | PostalUp |
|---|---|---|
| Price from | Free | $1.58/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Plans published | 7 | 10 |
| Spec score · Address Verification Software | 9.3 (#2) | 7.8 (#17) |
| Integrations | Listed integrations include Zapier, Adobe Commerce, WooCommerce, Contact Form 7, Gravity Forms, Gutenberg, Ninja Forms, FormAssembly, Formidable Forms, Formstack, JetFormBuilder and Elementor Pro. | The developer page provides a Postman collection and an OpenAPI specification for working with the API. |
| License | The OpenAPI reference identifies the API as copyright IDDQD Limited with all rights reserved, indicating proprietary software. | The downloads page says internal commercial use is included, while redistribution to customers requires a redistribution license. |
| Product | AddressZen provides US and international address lookup, autocomplete, validation, and verification. | PostalUp provides ZIP code databases and an address validation API for address standardization, verification, geocoding, and bulk address processing. |
| Support | Support and live chat are advertised Monday through Friday, 9 AM to 5 PM Eastern Time. | The developer page says technical support from its engineering team responds within 24 hours. |
Plans
AddressZen
- FreeFree
- Free for 1 yearFree
- 1,400 verified addresses$49, paid once
- 5,000 verified addresses$149, paid once
- 14,000 verified addresses$349, paid once
- 55,000 verified addresses$1,000, paid once
- Address bundle$1,000, paid once
PostalUp
- Free to TryFree
- ZIP Code Database Basic$19 a year
- Starter$29 a month
- ZIP Code Database Standard$39 a year
- ZIP Code Database Deluxe$79 a year
- Professional$99 a month
- ZIP Code Database Business$129 a year
- Scale$299 a month
- ZIP+4 Database Standard$299 a year
- EnterprisePriced on request
In their own words
AddressZen
AddressZen provides address lookup, autocomplete, validation, and verification for US and international addresses through an API, browser extension, and web interface. Its validation can normalize formatting, expand street and city abbreviations, add missing ZIP+4 details, and correct typos. It advertises coverage in 240+ countries and support for 60+ languages, with local address data that includes USPS sources for US verification and details such as apartment and suite numbers. Suggestions are real-time and matching accounts for typos. Developers can use JavaScript libraries, a React component, or a REST API; listed integrations include Zapier, Adobe Commerce, WooCommerce, and form tools. Batch validation and API key controls are available, including lookup limits, allowed URLs, and configurable transaction-log retention. The free plan includes 1,400 verified addresses for one year. The Address bundle is $1,000, paid once for 55,000 verified addresses. Billing is per verified address, with no setup fees or monthly commitment. The API reference limits each IP to 30 requests per second, with a separate autocomplete limit.
PostalUp
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.