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

Decidim
Prioneer.io
Loomio
Consul
Jina Rationale
Typeform
Polis
Online voting system (german & english) for Interactive Democracy, which is used by the Pirate...
Which is more popular?
Based on our record, LiquidFeedback seems to be more popular. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
|
ZIP
ZIP Code API
|
|
|
|---|---|---|
| Website | zip-codes.com | liquidfeedback.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 LiquidFeedback 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 LiquidFeedback yet.
Walkthroughs and reviews on video.
No ZIP Code API videos yet. You could help us improve this page by suggesting one.
LiquidFeedback 101
More videos
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and LiquidFeedback. 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.
An implementation of Liquid Democracy is Liquid Feedback, which the Pirate Party Germany uses Internally. Source: almost 4 years ago
There is also Liquid Feedback though I've never seen a live demonstration. Source: almost 5 years ago
Not yet but I'm hopeful about ideas like liquid democracy https://liquidfeedback.com/en/. - Source: Hacker News / about 5 years ago
When comparing ZIP Code API and LiquidFeedback, 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 LiquidFeedback:

Free Open-Source participatory democracy for cities and organizations
Compare Decidim to ZIP Code API or LiquidFeedback:

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

Prioneer is a stack ranking tool. Get people's priorities · Research customer pain points · Make team decisions · Create beautiful ranking surveys in 1 minute!
Compare Prioneer.io to ZIP Code API or LiquidFeedback:

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

Loomio helps groups of people make decisions together, online.
Compare Loomio to ZIP Code API or LiquidFeedback: