
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.
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
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.
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ZIP
ZIP Code API
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|---|---|---|
| Website | auth0.com | zip-codes.com |
| Pricing | — | |
| Company | Startup from the United States · 500 - 999 employees · 2013 | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Auth0 yet.
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...
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
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Walkthroughs and reviews on video.
GraphQL, Hasura, Apollo, and Auth0 for Vuejs developers by Devlin Duldulao
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Auth0 and ZIP Code API. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

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...
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Recommendations tracked on public social media and blogs since March 2021.

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
Tracking ZIP Code API since May 2026.
When comparing Auth0 and ZIP Code API, you can also consider the following products.

Enterprise-grade identity management for all your apps, users & devices
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Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Compare Smarty to Auth0 or ZIP Code API:

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

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

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

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