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
Auth0
Ping Identity
Microsoft Azure Active Directory
Amazon Cognito
Atlassian Crowd
Google Cloud IAM
On-demand SSO, directory integration, user provisioning and more

Which is more popular?
Based on our record, OneLogin seems to be more popular. It has been mentioned 1 time 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 | onelogin.com |
| Pricing | — | |
| 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 OneLogin 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
OneLogin is particularly recommended for mid-sized to large enterprises that require robust identity and access management across multiple applications and services. It's also suitable for organizations with a diverse set of cloud-based and on-premises applications, looking for a solution that enhances security and improves user experience.
Walkthroughs and reviews on video.
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Getting Started with OneLogin
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and OneLogin. 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
OneLogin’s single sign on enables users to secure login to multiple applications with just one username and password, by using the OneLogin platform to authenticate identity across all of your accounts. OneLogin...
OneLogin is an open source SSO provider, commonly used for quick access to cloud based applications. Greatly simplifies identity management with single click access whilst enforcing robust security. Users can log into...
OneLogin offers also offers a service called OneLogin Desktop, which acts as a form of endpoint management. Once users authenticate by logging in, they can access their secure applications on that device without an...
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
I think you have to login into onelogin.com first and that links you up with workplace, workday, dayforce etc. Source: over 3 years ago
When comparing ZIP Code API and OneLogin, 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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Enterprise-grade identity management for all your apps, users & devices
Compare Okta to ZIP Code API or OneLogin:

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

Auth0 is a program for people to get authentication and authorization services for their own business use.
Compare Auth0 to ZIP Code API or OneLogin:

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

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