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ProtoPie
Flinto
The most powerful way to plan, prototype and hand off to developers, all without code. Download a free trial and see why professionals choose Axure RP 9.
Smarty
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PostalDataPI
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Melissa Data Quality
Loqate
usZIPCodes.org
REST API for US ZIP, ZIP+4, and Canadian postal codes. Single unified endpoint covers address validation and standardization, radius search (centroid haversine and true spatial polygon intersection), point-to-point distance, autocomplete/typeah

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Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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|---|---|---|
| Website | axure.com | zip-codes.com |
| Pricing | — | |
| Company | Startup from the United States | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Axure yet.
API for US ZIP, ZIP+4, and Canadian postal code data. One unified endpoint set covers North America — no separate APIs by country or data type. What it does Address validation and standardization — production-grade parser with ZIP+4 append, refreshed monthly Radius search — centroid haversine and...
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It also makes sharing a prototype to be viewed by your team or client very easy with the click of a button. Also, Axure RP will publish your diagrams and prototypes to Axure Share on the cloud or on-premises. Just...
Axure, one from Prototyping tools for professional designers — you need to have some coding skills to blend in. However, once mastered, you will be able to create advanced interactive prototypes, click-through...
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