Smarty
Zipcodestack
PostalDataPI
Geoco.io
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

Superhuman
Spark Mail
InboxZero
FiloMail
Gmail
Missive
Sanebox
Email smarter & faster with a reinvented experience for your Gmail

Which is more popular?
Based on our record, Shortwave seems to be more popular. It has been mentioned 2 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 | zip-codes.com | shortwave.com |
| Company | Startup from the United States · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.

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...
No description of Shortwave yet.
What each product offers, as listed by its team.

Possible disadvantages
An editorial look at what each product does well and who it suits.

Overall verdict
Why this product is good
Recommended for
No analysis of Shortwave yet.
Walkthroughs and reviews on video.
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Tecsun PL-330 AM FM LW Shortwave SSB Portable Radio Review
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and Shortwave. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
> [2] https://shortwave.com Welp! It's already hugged to deathi guess. - Source: Hacker News / almost 3 years ago
Try Shortwave. A bunch of engineers quit Google and essentially resurrected it. Source: over 4 years ago
When comparing ZIP Code API and Shortwave, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Compare Spark Mail to ZIP Code API or Shortwave:

The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
Compare PostalDataPI to ZIP Code API or Shortwave:

The best and most innovative mail app to master your overloaded mailbox.
Compare InboxZero to ZIP Code API or Shortwave: