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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

Which is more popular?
Based on our record, AudioPen seems to be more popular. It has been mentioned 5 times since March 2021.
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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| Website | audiopen.ai | zip-codes.com |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of AudioPen 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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Make Writing a Breeze with AudioPen AI (Review)
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Recommendations tracked on public social media and blogs since March 2021.

Hey everyone, IOS dev novice here. I'm looking to build an interactive widget that has capabilities similar to this application: https://audiopen.ai/. Source: almost 3 years ago
Take a look at audiopen.ai , they have the same concept. Source: over 3 years ago
No list of audiopen.ai (should be under "essential tools to have") nor something fun like selfgazer.com. Audiopen is this insane app that records any of your conversations, then analyzes and summarizes them - seriously I can't stress... Source: over 3 years ago
Tracking ZIP Code API since May 2026.
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Experience the power of our AI-driven tool as it instantly transforms your spoken words into a concise and informative summary!
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Create transcripts, blog posts, video scripts & more. Just talk casually and let the AI handle the rest! Works in 50+ languages.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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