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

Lo-Fi Radio
NotchNook
LookingGlass
TheBoringNotch
Moosync
eqMac
Spotify
Your currently playing track displayed right on your desktop

Which is more popular?
Based on our record, Sleeve seems to be more popular. It has been mentioned 9 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 | replay.software |
| 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 Sleeve 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
No analysis of Sleeve yet.
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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 Sleeve. 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 use the Mac app more, and coming from Spotify (I tried Apple Music once, but the UI was so bad it made me go back), I like how a number of other things can be accomplished with other apps. For example, instead of using the basic "Edit... Source: over 3 years ago
If you're an avid music listener, Sleeve will serve you well with it's very elegant and customizable desktop display. Source: over 3 years ago
I use an app called Sleeve that scrobbles the music from the Apple Music app to Last.fm. Source: over 3 years ago
When comparing ZIP Code API and Sleeve, 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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Lofi.radio listen to your favorite lo-fi music with notes
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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LookingGlass Cyber™ offers cybersecurity against phishing, malware and other cyber attacks for small business, global enterprises and government agencies.
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