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

Okta
OneLogin
Ping Identity
Amazon Cognito
Microsoft Azure Active Directory
LoginRadius
Atlassian Crowd
Auth0 is a program for people to get authentication and authorization services for their own business use.

Which is more popular?
Based on our record, Auth0 seems to be more popular. It has been mentioned 205 times since March 2021.
Website, pricing, platforms and company facts side by side.
|
ZIP
ZIP Code API
|
|
|
|---|---|---|
| Website | zip-codes.com | auth0.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | Startup from the United States · 500 - 999 employees · 2013 |
| 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 Auth0 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.
No ZIP Code API videos yet. You could help us improve this page by suggesting one.
GraphQL, Hasura, Apollo, and Auth0 for Vuejs developers by Devlin Duldulao
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 Auth0. 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
Auth0 is an excellent choice for projects requiring advanced authentication features and enterprise-grade security.
Launched in 2013, Auth0 is a product unit under Okta. One of the reliable SaaS solutions to take a modern approach to application authentication and identity management. With Auth0, IT admins can connect any...
But since user data is a lot more serious than wasting a pepperoni pizza, let’s check out some user authentication platforms. And while an average business person will straightaway run towards Auth0 or Firebase, there...
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Auth0 is the identity platform behind all of this: developer-first, deeply flexible, and designed to scale from a weekend project to enterprise-grade infrastructure without forcing teams to trade control for convenience. - Source: dev.to / about 1 month ago
To answer these questions, I built a real example around it: an expense-approval agent for a fictional company, using Microsoft Agent Framework on the backend and Auth0 to handle every identity decision along the way. It turned into a... - Source: dev.to / about 1 month ago
For hosted auth, the market has a few solid options. Auth0 is the incumbent — mature, well-documented, but the pricing can surprise you as you scale. Clerk is developer-friendly with great React components, though you're fairly locked... - Source: dev.to / 6 months ago
When comparing ZIP Code API and Auth0, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Compare Smarty to ZIP Code API or Auth0:

Enterprise-grade identity management for all your apps, users & devices
Compare Okta to ZIP Code API or Auth0:

Free Zip Code API - Free Postal Code Validation | Zipcodestack
Compare Zipcodestack to ZIP Code API or Auth0:

On-demand SSO, directory integration, user provisioning and more
Compare OneLogin to ZIP Code API or Auth0:

The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
Compare PostalDataPI to ZIP Code API or Auth0:

Ping Identity provides cloud-based, single sign-on and identity management solutions with their SAML SSO.
Compare Ping Identity to ZIP Code API or Auth0: