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

draw.io
OmniGraffle
yEd
Miro
Gliffy
Visio
PlantUML
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.
Which is more popular?
Based on our record, LucidChart seems to be more popular. It has been mentioned 5 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 | lucidchart.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | Startup from the United States |
| 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 LucidChart yet.
What each product offers, as listed by its team.

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Why this product is good
Recommended for
Overall verdict
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Data Analysis topicsData Analysis topicsData Analysis topicsData Analysis topics7 free database diagramming tools for busy data folks1. Diagrams.netHow it worksWhy it's free2. dbdiagramHow it worksWhy it's free3. ERD...
If you’re prototyping, teaching, or diagramming casually, free data modeling software like ERD Plus, QuickDBD (free tier), or Creately (free plan) may cover your needs. But for production systems, audits, or CI/CD...
Lucidchart is another cloud-based tool tailored for creating detailed database diagrams online. As a web-based application, it offers accessibility from anywhere and also provides dedicated apps for Android and iOS....
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
I'm thinking something like a lucidchart.com set up, but also wondering since one project is complete if there is anything that can just analyze an existing codebase and automatically do the work for me. Source: almost 5 years ago
Oh! excalidraw.com is great for quick paper style diagrams. I have used it a fair bit. The roam integration is good. But I always revert back to draw.io because it's open sourced, simple to use and just works :D If you are looking for... Source: almost 5 years ago
You could try lucidchart.com or draw.io. I have used both. Source: over 5 years ago
When comparing ZIP Code API and LucidChart, 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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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.
Compare OmniGraffle to ZIP Code API or LucidChart:

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

yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
Compare yEd to ZIP Code API or LucidChart: