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

Qminder
Waitwhile
Queue-it
QLESS
Qwaiting
WaitWell
Appointment + QueueManagement
Queue management system software for queuing customers and gather their feedbacks, monitor real-time information and speed of services.

Which is more popular?
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 | skiplino.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 Skiplino 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.

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

Share your experience with using ZIP Code API and Skiplino. For example, how are they different and which one is better?
When comparing ZIP Code API and Skiplino, 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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Qminder works the way it sounds: It helps a company mind its queues.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Queue-it empowers organizations to deliver seamless user experiences and protect their brand reputation by controlling online traffic.
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