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

DuD-Poll
Doodle
Framadate
Smart Scheduling
Fasterplan
FreeBu
CozyCal
FullCalendar is an open-source JavaScript event calendar.

Which is more popular?
Based on our record, FullCalendar seems to be more popular. It has been mentioned 16 times since March 2021.
Website, pricing, platforms and company facts side by side.
|
ZIP
ZIP Code API
|
|
|
|---|---|---|
| Website | zip-codes.com | fullcalendar.io |
| 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 FullCalendar 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 FullCalendar yet.
Walkthroughs and reviews on video.
No ZIP Code API videos yet. You could help us improve this page by suggesting one.
Episode #042 - FullCalendar Events and Scheduling
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and FullCalendar. 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.
There are dozens of open source Google calendar clones in JS; picking a random not-react example off of the front page of an npm search: https://fullcalendar.io/. - Source: Hacker News / 12 months ago
FullCalendar is an exhaustive calendar library offering extensive customization options. It supports features like dragging, resizing, and event handling, making it ideal for scheduling applications. - Source: dev.to / over 2 years ago
The only complexity with Temporal is the size of the polyfill. However, an alternative polyfill has been in development for some time now — temporal-polyfill by FullCalendar. Its size is much more appealing: 60.7 kB to 21.7 kB (gzip).... - Source: dev.to / over 2 years ago
When comparing ZIP Code API and FullCalendar, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Compare Smarty to ZIP Code API or FullCalendar:

Dudle is an online scheduling application, which is free and open source.
Compare DuD-Poll to ZIP Code API or FullCalendar:

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

Make meetings happen. With Doodle, scheduling becomes quick and easy.
Compare Doodle to ZIP Code API or FullCalendar:

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