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

WinDirStat
TreeSize
SpaceSniffer
TeraCopy
Baobab Disk Usage Analyzer
DaisyDisk
Baobab
WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.

Which is more popular?
Website, pricing, platforms and company facts side by side.
|
ZIP
ZIP Code API
|
|
|
|---|---|---|
| Website | zip-codes.com | antibody-software.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 WizTree 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
WizTree is recommended for users who need to identify and manage large files on their computer quickly. It is particularly useful for IT professionals, system administrators, and any computer user looking to efficiently organize their storage without fuss.
Walkthroughs and reviews on video.
No ZIP Code API videos yet. You could help us improve this page by suggesting one.
(reup old vid) PC Spotlight - WizTree - Find Whats Taking Up Hard Drive Space Quickly And Pain Free
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and WizTree. For example, how are they different and which one is better?
When comparing ZIP Code API and WizTree, you can also consider the following products.

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

WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Compare WinDirStat to ZIP Code API or WizTree:

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

TreeSize tells you where precious disk space has gone to.
Compare TreeSize to ZIP Code API or WizTree:

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

SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.
Compare SpaceSniffer to ZIP Code API or WizTree: