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

Zoho Invoice
Bill.com
Wise
InvoiceOcean
ChargeDesk
EasyBill
Agnitumus Billing System
The Invoice Machine is an online invoicing service with a simple and elegant user interface.

Which is more popular?
Website, pricing, platforms and company facts side by side.
|
ZIP
ZIP Code API
|
|
|
|---|---|---|
| Website | zip-codes.com | invoicemachine.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | Startup from Sweden |
| 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 The Invoice Machine 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
Freelancers, small business owners, and entrepreneurs who require a simple, intuitive platform for invoicing and keeping track of client payments without the need for complex accounting features.
How often each product is chosen within a category, 0–100% relative to the other.

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

We have no reviews of ZIP Code API yet. Be the first one to post
The Invoice Machine has all the basic features of an online invoicing tool. It simplifies bookkeeping and makes invoice generation a breeze. The API is open source, which means you can modify it with a few HTTP POST...
When comparing ZIP Code API and The Invoice Machine, 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 The Invoice Machine:

100% free online invoicing software for small businesses.
Compare Zoho Invoice to ZIP Code API or The Invoice Machine:

Free Zip Code API - Free Postal Code Validation | Zipcodestack
Compare Zipcodestack to ZIP Code API or The Invoice Machine:

Your financial operations platform. The intelligent way to create and pay bills, send invoices, manage expenses, control budgets, and access the credit your business needs to grow—all on one platform.
Compare Bill.com to ZIP Code API or The Invoice Machine:

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

Currency exchange Banks and other providers could charge you up to 5% in hidden costs when sending ...
Compare Wise to ZIP Code API or The Invoice Machine: