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

1Password
Dashlane
Psono Password Manager
Team Password Manager
Spectre
Keeper
True Key
Passwork is an corporate password manager built for security-conscious organizations. Developed and headquartered in Europe (Barcelona, Spain), Passwork meets GDPR, NIS2, ENS and other European regulatory requirements by design.

Which is more popular?
Based on our record, Passwork seems to be more popular. It has been mentioned 4 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 | passwork.pro |
| Pricing | — | |
| Platforms | — | |
| Company | Startup from the United States · 2026 | Startup from Spain |
| 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...
Passwork — self-hosted enterprise password manager with zero-knowledge encryption Passwork is an on-premise corporate password manager built for security-conscious organizations. Developed and headquartered in Europe (Barcelona, Spain), Passwork meets GDPR, NIS2, ENS and other European regulatory...
What each product offers, as listed by its team.

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
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and Passwork. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Here is a one more option that I use Https://passwork.pro/. Source: over 3 years ago
We use passwork.pro which is self hosted, reasonable priced and fast. Source: about 4 years ago
Hah, we were actually considering them for the same reason just last month - we ended up going with https://passwork.pro/. Source: over 4 years ago
When comparing ZIP Code API and Passwork, 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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1Password can create strong, unique passwords for you, remember them, and restore them, all directly in your web browser.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Dashlane is a secure way to bypass tedious logins, forms, and purchases online. Save all of your information and save time in your online transactions.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Secure password manager that is open source with auto form fill, random password generator and many...
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