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

ChatPDF
ChatGPT
Sharly AI
PDF.ai
Docalysis
Humata AI
NotebookLM
Chat with documents.

Which is more popular?
Based on our record, ChatDOC seems to be more popular. It has been mentioned 7 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 | chatdoc.com |
| 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 ChatDOC 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
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
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ChatDOC Chat with your documents 23 March 2023
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and ChatDOC. 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.
I search an alternative to ChatDoc with an available API. I want to make an app where the user can upload a PDF and ask question about it. Source: over 3 years ago
I want to try this, but it's stuck at processing, showing 100% but not usable. I‘ve tried a lot of chat-with-pdf apps, including ChatDOC, ChatPDF, Humata and others. For serious paper reading, I must say that... - Source: Hacker News / over 3 years ago
Try ChatDoc: https://chatdoc.com/ I think it might be just what you're looking for. Source: over 3 years ago
When comparing ZIP Code API and ChatDOC, 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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Chat with any PDF! Join millions of students, researchers and professionals to instantly answer questions and understand research with AI
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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ChatGPT is a powerful, open-source language model.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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