
Postio.co.uk
Ideal postcodes
Fetchify
Smarty
Data8 UK
ZIP Code API
Data8 UK PredictiveAddress
The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.

Every Voice
True Causes
Hillary Clinton
Platformative
Decidim
Field the Bern
LiquidFeedback
Know what your organization is thinking.

Which is more popular?
Based on our record, Polis seems to be more popular. It has been mentioned 10 times since March 2021.
Website, pricing, platforms and company facts side by side.
|
|
|
|
|---|---|---|
| Website | postaldatapi.com | pol.is |
| Pricing | — | |
| Company | Startup from the United States · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


PostalDataPI is a global postal code validation and enrichment API covering 240+ countries and territories. One API, one key, one flat rate — $0.000028 per query with no tiers or subscriptions. What you get back: Up to 18 metadata fields per postal code — city, state/region, coordinates,...
No description of Polis yet.
What each product offers, as listed by its team.


Possible disadvantages
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 Polis yet.
Walkthroughs and reviews on video.
PostalDataPI Now Returns 18 Fields Per Postal Code — for 240+ Countries
More videos
Polis Review: Boy, Those Ancient Greeks Sure Loved Wheat! - By Board Of It
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using PostalDataPI and Polis. 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 PostalDataPI yet. Be the first one to post
Polis: Deferendum offers a more streamlined approach to group decision-making, where members can participate in debates and voting on solutions remotely and without the need for face-to-face meetings. Polis, on the...
Recommendations tracked on public social media and blogs since March 2021.


Tracking PostalDataPI since Apr 2026.
Related: https://pol.is/home Pol.is is a tool that uses ML to synthesize these shared views and provide inisght into both areas of consensus and discordance. I am not sure of the specific relationships but it has been championed by... - Source: Hacker News / over 1 year ago
Vtaiwan is inspiring beyond words, and I hope to give Audrey tang a big hug one day. It was forked from Polis I think - https://pol.is/home. - Source: Hacker News / over 3 years ago
If you are interested in reading more about the tool itself here's their homepage, it's pretty neat! Source: about 4 years ago
When comparing PostalDataPI and Polis, you can also consider the following products.

Fast UK address, email & phone validation APIs for developers. Official Royal Mail PAF data. Pay as you go, 100 free lookups.
Compare Postio.co.uk to PostalDataPI or Polis:

A mobile app to lobby your elected representatives.
Compare Every Voice to PostalDataPI or Polis:

We help businesses improve UX and data quality with a cutting edge address validation service.
Compare Ideal postcodes to PostalDataPI or Polis:
True Causes is a tool for group root-cause analysis at scale: participants independently propose and link causes, building one shared causal map whose high-leverage roots identify what to act on. It digitizes and scales Structured Democratic Dialogue
Compare True Causes to PostalDataPI or Polis:

Fetchify delivers fast, accurate address, email, phone and bank validation tools that help businesses capture clean, verified customer data, reduce failed deliveries and improve checkout experiences worldwide.
Compare Fetchify to PostalDataPI or Polis:
