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

SocialPilot
Facebook for Business
Fomo
Buzzstream
SocialXpand
RiteTag
Backly
It’s Like Having an Entire Facebook Marketing Team On Demand

Which is more popular?
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 | postplanner.com |
| 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 PostPlanner 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
PostPlanner is recommended for social media managers, small business owners, digital marketing professionals, and bloggers who need a reliable tool to manage and optimize their social media content strategy. It's particularly useful for those who want to increase engagement and maintain a regular posting schedule with the help of algorithmically suggested content.
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and PostPlanner. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

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Post Planner is a notable alternative to Agorapulse, offering a range of features for effective social media management. Like Agorapulse, Post Planner provides scheduling and publishing capabilities, enabling users to...
When comparing ZIP Code API and PostPlanner, 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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SocialPilot is an app designed to help businesses and professionals with social media marketing.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Facebook Business gives the latest news, advertising tips, best practices and case studies to meet the business goals.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Fomo turns your site into the online equivalent of a busy store
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