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

Shortwave
Spark Mail
Gmail
Sanebox
InboxZero
Airmail
FiloMail
Superhuman is an email management tool.

Which is more popular?
Based on our record, Superhuman seems to be more popular. It has been mentioned 26 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 | superhuman.com |
| Platforms | — | |
| 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 Superhuman 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
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
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How Superhuman Email Works
More videos
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and Superhuman. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

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It's important to note that Superhuman doesn't offer a free version or trial, which could be a drawback for those who prefer to test a service before committing to a subscription. However, Superhuman does provide a...
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
A Superhuman-style email interface with a clean inbox and focused email preview. - Source: dev.to / 6 months ago
Remember I said that some apps address these issues much better than others? Recent famous examples are Linear and Figma. Both have disrupted incredibly competitive markets by being technologically superior. Other examples are Superhuman... - Source: dev.to / over 2 years ago
Then there is the mother of all. Superhuman, advocating for productivity in emails:. - Source: dev.to / over 2 years ago
When comparing ZIP Code API and Superhuman, 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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Email smarter & faster with a reinvented experience for your Gmail
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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 Superhuman:

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

Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.
Compare Gmail to ZIP Code API or Superhuman: