
Readwise
Raindrop.io
Instapaper
Omnivore
Follow
My Mind
Alfread
Create a feedback-focused culture in Slack with Matter!
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

Which is more popular?
Website, pricing, platforms and company facts side by side.
|
|
ZIP
ZIP Code API
|
|
|---|---|---|
| Website | matterapp.com | zip-codes.com |
| Pricing | — | |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

Recognize team members with Kudos, rewards, and feedback in Slack. Matter is: - Free Forever - Easy Set Up - Unlimited Members - No Credit Card Required Start #FeedbackFriday today!
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
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Matter Compilation: Crash Course Kids
More videos
No ZIP Code API videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.

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

About Matter: Matter is a versatile employee recognition technology that smoothly interacts with Slack and Microsoft Teams, making it ideal for companies looking to enhance employee engagement directly within their...
About Matter: Matter is a cutting-edge employee recognition platform that prioritizes peer-to-peer recognition and immediate feedback. Designed to integrate seamlessly with tools like Slack and Microsoft Teams, Matter...
We have no reviews of ZIP Code API yet. Be the first one to post
When comparing Matter and ZIP Code API, you can also consider the following products.

Effortlessly rediscover and organize your Kindle highlights
Compare Readwise to Matter or ZIP Code API:

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Compare Smarty to Matter or ZIP Code API:

All your articles, photos, video & content from web & apps in one place.
Compare Raindrop.io to Matter or ZIP Code API:

Free Zip Code API - Free Postal Code Validation | Zipcodestack
Compare Zipcodestack to Matter or ZIP Code API:

Instapaper is a simple tool to save web pages for reading later.
Compare Instapaper to Matter or ZIP Code API:

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