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LucidChart
OmniGraffle
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Dia
UMLGraph
The visual workspace for teams.
Smarty
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PostalDataPI
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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, Whimsical seems to be more popular. It has been mentioned 60 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 | whimsical.com | zip-codes.com |
| Pricing | — | |
| Company | Startup from the United States | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Whimsical 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
Whimsical is ideal for product managers, designers, developers, and any teams that require a collaborative platform for visualizing ideas, creating wireframes, and organizing project workflows efficiently.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
CREATE WIREFRAMES (FAST) WITH WHIMSICAL [THOUGHTS & FIRST IMPRESSIONS]
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Whimsical 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.

Use tools like Whimsical or Figma to prototype before coding. - Source: dev.to / over 1 year ago
I really do not want to see what a mail client with the UX of notion looks like. If anyone uses Notion and really cannot stand their UX, I'd strongly recommend Whimsical: https://whimsical.com/ -- it can do a bit of Trello too. - Source: Hacker News / over 1 year ago
I thought for a moment you were talking about https://whimsical.com/, which is productivity suite that people depend on for work. I wouldn't want to hear it's shutting down! Then I realized you're talking about the concept of whimsical... - Source: Hacker News / over 1 year ago
Tracking ZIP Code API since May 2026.
When comparing Whimsical and ZIP Code API, you can also consider the following products.

Join Millions of users that collaborate from all over the planet using Miro. Experience the power of the #1 visual workspace for innovation. More than 100M users and 250,000 companies are collaborating on the canvas.
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Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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