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

Proxyclick
SwipedOn
The Receptionist
TractionGuest
Teem
WhosOnLocation
VisitorTrack
Visitor registration that's changing how guests are greeted in companies around the world.
Which is more popular?
Based on our record, Envoy seems to be more popular. It has been mentioned 8 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 | envoy.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 Envoy 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
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Here's a 2008 GMC Envoy SLT - 10 Year Later Review | For Sale Today $10,880
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Share your experience with using ZIP Code API and Envoy. 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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Envoy is a high-performance distributed proxy written in C++. It can be used as an L4 or L7 load balancer, and is designed for building large distributed service meshes and microservices. It simplifies building...
For free mailroom management software you can fully trust, go to Envoy today. Envoy also has package notifications, automatic reminder software, and mailroom data analytics software.
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Envoy (https://envoy.com) | Software Eng (Product, Backend) | San Francisco, CA (ONSITE) I'm hiring engineers for a Special Projects team to rapidly iterate and ship experimental products with the goal to define what the future of... - Source: Hacker News / almost 2 years ago
We have been working closely with users of Cerbos such as Envoy, Blockchain.com, Utility Warehouse, 9fin, and Salesroom on this release. We can’t wait to hear more about what you would like to see in future releases - join our Slack... - Source: dev.to / almost 3 years ago
Envoy sells products for managing hybrid workspaces: https://envoy.com/ So hardly an unbiased source. - Source: Hacker News / about 3 years ago
When comparing ZIP Code API and Envoy, 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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SwipedOn is a smart but simple visitor management solution. Our paperless gateway makes connecting people intuitive and easy.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
Compare PostalDataPI to ZIP Code API or Envoy:

The Receptionost is a visitor managemnt solution that has visitor logging system to track visitor traffic.
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