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

Mozilla Add-ons
Plugins Addons Extensions
Addoncrop
Chrome Extension Downloader
CRX4Chrome
Chrome Web Store
Browser-extensions.club
Get extensions and themes for the http://alternativeto.net/software/opera browser.

Which is more popular?
Based on our record, Opera Add-ons 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 | addons.opera.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 Opera Add-ons 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 Opera Add-ons yet.
How often each product is chosen within a category, 0–100% relative to the other.

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

We have no reviews of ZIP Code API yet. Be the first one to post
Opera’s App Store – We’ll be honest, we didn’t know Opera had a mobile store until we started researching for this. It has a bunch of options. However, all of those options default to the Google Play Store anyway....
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Test to see if the same thing happen with an extension installed from https://addons.opera.com/en/ or https://chrome.google.com/webstore/category/extensions. Source: over 3 years ago
For extensions, you can't back them up and restore them, so you'll just have to reinstall them from https://chrome.google.com/webstore/category/extensions and https://addons.opera.com/en/. If you bookmark the URL to each extension's... Source: almost 4 years ago
When comparing ZIP Code API and Opera Add-ons, 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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Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Plugins Addons Extensions is a platform that provides a one-stop-shop for all the latest Chrome extensions that can help you to run your business.
Compare Plugins Addons Extensions to ZIP Code API or Opera Add-ons:

The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Extends the functionality of your web browser
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