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

Fast.com
Speedtest.net
SpeedOf.Me
LibreSpeed
Speed Test by Cloudflare
nPerf
OpenSpeedTest
Accurately test your Internet connection speed with this powerful broadband speed test. Improve your bandwidth speed with the truth.

Which is more popular?
Based on our record, Testmy.net seems to be more popular. It has been mentioned 175 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 | testmy.net |
| 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 Testmy.net 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
This tool is particularly recommended for individuals who require consistent and accurate monitoring of their internet speed, such as gamers, remote workers, and tech enthusiasts who need to troubleshoot connectivity issues effectively.
Walkthroughs and reviews on video.
No ZIP Code API videos yet. You could help us improve this page by suggesting one.
Speed Test at testmy.net
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and Testmy.net. 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.
Hello! Ever since moving into a new house, I've haven't been getting the speeds I've expecting. Specifically, videos and websites will fail to load or load extremely slowly most of the time. The odd thing is, when running a speed test... Source: almost 3 years ago
Another speed test site is https://testmy.net The site claims superior accuracy (which I can't confirm but probably someone here can evaluate one way or the other). The site offers a number of test options and other amenities. I'll have... - Source: Hacker News / about 3 years ago
T-Mobile - 5G WI-FI decently priced... If it only worked! Below I'll post my results from a few hours of a test I did today using Testmy.net. This is an every day occurrence. You could be watching a YouTube video at a nice 1080p60, but... Source: over 3 years ago
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Test your Internet connection bandwidth to locations around the world with this interactive broadband speed test from Ookla
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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SpeedOf.Me is an HTML5 Internet speed test. No Flash or Java needed!
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