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

Auth0
Clerk
Frontegg
Descope
PropelAuth
Kinde
Amazon Cognito
Application and Data, Application Utilities, and User Management and Authentication

Which is more popular?
Based on our record, WorkOS seems to be more popular. It has been mentioned 19 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 | workos.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 WorkOS 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 WorkOS yet.
Walkthroughs and reviews on video.
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Add SSO to your Next.js app using WorkOS in 7 minutes
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How often each product is chosen within a category, 0–100% relative to the other.

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External articles and on-site reviews we used to compare the two products.

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Just launched in 2018, and WorkOS is already well liked by many enterprises and IT developers. The all in one solution boasts Enterprise SSO and supports all OIDC and SAML providers right out of the box.
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
On November 2nd, WorkOS disclosed that an attacker using the ARTEX offensive framework had accessed one of their internal sales tools. Rather than this originating from a state-sponsored attacker, a security researcher had come forward... - Source: dev.to / 3 days ago
WorkOS AuthKit is user management with a 1 million MAU free band, then $2,500/mo per extra million. Staging is free. Production AuthKit still requires a payment method on file even if you never cross 1M MAU. Hosted custom domain is... - Source: dev.to / about 1 month ago
Dr. Tobin South is no stranger to the overlapping worlds of AI research, security, and enterprise software. After a wild ride through MIT’s AI scene (and a ChatGPT moment that changed everything), Tobin plunged into the depths of... - Source: dev.to / about 1 year ago
When comparing ZIP Code API and WorkOS, 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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Auth0 is a program for people to get authentication and authorization services for their own business use.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Clerk.io, the artificial intelligence for e-commerce that knows your customers interests.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Elegant user management, tailor-made for B2B SaaS
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