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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, A Soft Murmur seems to be more popular. It has been mentioned 93 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 | asoftmurmur.com | zip-codes.com |
| Company | Startup from Australia | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of A Soft Murmur 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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Why this product is good
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A Soft Murmur REVIEW | Mobile Apps
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Share your experience with using A Soft Murmur and ZIP Code API. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

I haven't heard of that one, will look into it. I used to use https://asoftmurmur.com/ for a long while. I prefer the separate device I have now instead of an app. - Source: Hacker News / over 1 year ago
I believe this is adjacent, but I quite like https://asoftmurmur.com/. I’m not sure if it’s able to run offline. - Source: Hacker News / almost 3 years ago
This isn't music per say, but do you know about A Soft Murmur? Source: almost 3 years ago
Tracking ZIP Code API since May 2026.
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Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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