
When2Meet
Doodle
WhenAvailable
OnceHub
x.ai
Boomerang Calendar
Koalendar
Use your availability to find a time that works for everyone
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

Which is more popular?
Based on our record, Crab Fit seems to be more popular. It has been mentioned 3 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 | crab.fit | zip-codes.com |
| Pricing | — | |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Crab Fit yet.
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...
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
How often each product is chosen within a category, 0–100% relative to the other.

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

Https://crab.fit/ is an open-source solution. It has a different interface that is much more compact and convenient. I honestly love it. - Source: Hacker News / 10 months ago
Hadn't heard of crab.fit but that looks cool. There are some similarities for sure but it seems to take a very different approach which is not the one I would choose when it comes to finding an answer. i.e. I prefer to be able to choose... Source: over 4 years ago
Just curious: How does it compare to other open source solutions like crab.fit or framadate? Source: over 4 years ago
Tracking ZIP Code API since May 2026.
When comparing Crab Fit and ZIP Code API, you can also consider the following products.

When2meet helps you find the best time for a group to get together. It is a free survey tool that is quick and easy to use.
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Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Make meetings happen. With Doodle, scheduling becomes quick and easy.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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WhenAvailable is an excellent event management tool that allows scheduling the dinner party, book club meeting, and guys’ night out with simple and best ideas.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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