Compare this with other toolsSave it to your board and evaluate your options side by side.

Postcoder Reviews & Product Details

Postcoder is an address lookup and customer data verification API developed by Allies Computing. Used by over 10,000 organisations worldwide, Postcoder helps businesses capture and verify customer data at the point of entry by bringing address lookup and autocomplete, bank validation, email validation, mobile validation, and OTP verification together in a single integration. With access to Royal Mail PAF, Multiple Residence data, Ordnance Survey AddressBase property records, and international addresses across 249 countries, Postcoder's address lookup and autocomplete delivers verified results instantly. Users can search by postcode, partial address, or coordinate position, with rooftop-level geocoordinates included for every result. Whether you're running an e-commerce checkout, a delivery workflow, or a customer onboarding journey, the data returned is precise and ready to use. Postcoder offers multiple features in a single API. Bank validation checks sort codes and account numbers in real time, confirms direct debit eligibility, and returns full branch details, making it well suited to lenders, subscription platforms, and businesses collecting payment mandates. Email validation assesses formatting, domain health, and risk signals such as disposable addresses, helping teams protect deliverability and maintain clean CRM records. Mobile validation checks whether a number is live and connected across more than 200 countries, reducing wasted outreach and improving contact rates. OTP verification sends one-time passwords via SMS to authenticate users at sign-up, login, or checkout, with no separate SMS provider required, making it straightforward to add an extra layer of security to any customer-facing journey. Trusted by organisations including NHS, Sky, Rightmove, and KFC, Postcoder is built for teams that take data quality seriously. A 30-day free trial, thorough documentation, and ready-to-use sample code mean developers can be up and running in minutes, no credit card needed.

Product Website

Seller

Allies Computing

Discussions

Postcoder Community

Languages Supported

English

Overview by

Jasmine Robinson Madden

Pricing

Pricing provided by Postcoder.

Credit packs

Starting at £27.00

With One-Time Purchase

View More Pricing Information

Postcoder Integrations

(9)

Verified by Postcoder

Postcoder Media

A UX mockup of Postcoder address lookup being used in an online checkout

A UX mockup of Postcoder bank validation being used in a subscription service

A UX mockup of Postcoder OTP API as used in a ride-hailing app

Postcoder API returning valid email, mobile number, and address autocomplete.

Email validation API javascript sample code from the Postcoder docs.

Mobile validation API javascript sample code from the Postcoder docs.

G2 reviews are authentic and verified.

Here's how.

Kevin R.

eCommerce Manager

Mid-Market (51-1000 emp.)

10/31/2025

"Reliable Address Finder That Just Works—No Complaints!"

5/5

What do you like best about Postcoder?

The most helpful thing is it does what it is meant to do. It easily find the address. We rarely have customer queries or complaints around postcodes or address not found or missing. No news is good news. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

There is nothing of note that comes to mind in terms of negatives. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

edit

Hi Kevin, thanks for such a positive review. We really appreciate hearing from happy customers!

Joaquin R.

TechOps Engineer

Mid-Market (51-1000 emp.)

7/29/2025

"Powerful and developer-friendly validation tool"

4/5

What do you like best about Postcoder?

We love the developer-friendly API; it makes integration into websites and applications very simple. This, combined with its highly accurate and reliable address data, makes it a powerful tool for our business as we want to improve data quality and streamline our checkout or sign-up processes. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

It's a bit challenging to manage team members within the admin dashboard. And the credit-based pricing model can be a bit complicated. Review collected by and hosted on G2.com.

What problems is Postcoder solving and how is that benefiting you?

Customers often make mistakes when typing their address, email, or phone number - Postcoder provides real-time validation and address auto-completion. This drastically improves data quality, reduces the number of failed deliveries, and ensures you have reliable contact information for your customers. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

edit

Thank you for your great feedback—we’re really pleased to hear Postcoder is helping to improve your data quality and simplify integration. We appreciate your comments on managing users on the dashboard and this is something out development team are currently working to improve. Regarding our pricing, our credit-based model is designed to be flexible and cost-effective by letting you use just one credit pack across all our services, but we do understand that it may not be clear for all users, so please see https://postcoder.com/pricing for a breakdown of costs and how many credits each request will use.

Gerry O.

11/26/2025

"Simple to use API, Excellent Support"

5/5

What do you like best about Postcoder?

I found Postcoder easy to setup and we utilise the API to retrieve and confirm Eircodes (Irish post codes). The graphical user interface (GUI), is well designed and has all the key features needed. The customer support provided by Postcoder has also been excellent, offering prompt and effective assistance whenever required. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

OAuth could be introduced to improve security. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

edit

Thank you for taking the time to leave such a detailed review; we’re delighted to hear that you find Postcoder easy to use and that our support has been helpful. OAuth is something our developers are constantly monitoring and considering, and your feedback helps guide our ongoing improvements.

Jim F.

8/1/2025

"Seamless Address Verification, Exceptional Support"

5/5

What do you like best about Postcoder?

I appreciate Postcoder’s robust and detailed API documentation, which made setup incredibly swift and seamless. The thorough SDKs were immensely valuable in this process. I also greatly value the high quality of address lookups, which ensures top-tier results from credit checks and eliminates manual searches for our customers. This leads to high customer satisfaction and conversion rates, sometimes exceeding 80% in lending journeys. My overall experience with Postcoder has been excellent from the start, so much so that I would unequivocally purchase it again and recommend it highly with a perfect score of ten out of ten. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Nothing at this time. Review collected by and hosted on G2.com.

What problems is Postcoder solving and how is that benefiting you?

I use Postcoder to ensure high-quality address lookups, which enhances return rates from credit bureaus and maintains high customer satisfaction. It streamlines processes, eliminates manual searches, and significantly boosts conversion rates, improving lending journey outcomes with conversion rates as high as 80%. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

edit

Thank you for such a glowing review Jim, we really appreciate your feedback and your business.

Joshua G.

Head of Engineering

Small-Business (50 or fewer emp.)

5/21/2025

"Postcoder -Best in class address lookup tooling"

5/5

What do you like best about Postcoder?

The ease of use and their documentation is superb. Allowing me to hook up to the service very easily. They also have a wide offering of services that I haven't taken full advantage of yet, but nice to see they have a good ecosystem. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Not clear how to add other members of my team there, it'd be good to allow other members of my organisation to manage it. Could just be something I've missed though Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

edit

HI Joshua, thank you so much for your review. We're especially pleased to hear that you value our wide range of features and found the setup and documentation so easy to work with! In terms of adding a new user to your account, this is something we are working on to give customers control of, but for the time being if you would like to add new users then please just email into sales@alliescomputing.com with the name and email address of the person you'd like to add and we will be more than happy to set that straight up for you!

Simon M.

Small-Business (50 or fewer emp.)

3/26/2024

"Does exactly what you need it to do"

4.5/5

What do you like best about Postcoder?

Easy to integrate into our platform and very reliable. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Would love it to be cheaper but wouldnt change anything else Review collected by and hosted on G2.com.

Response from Garrie Clayton-Flatt of Postcoder

edit

Hi Simon, your feedback is much appreciated. We are really pleased to hear you find the portal excellent and easy to navigate, and that the customisable alert settings have proven useful.

Verified User in Consumer Services

Small-Business (50 or fewer emp.)

4/4/2025

"Postcoder does so much more"

3.5/5

What do you like best about Postcoder?

We've been using Postcoder.com for many years and have had a fantastic experience. Originally we just used it for address lookup, the platform has evolved significantly, offering much more than just postcode validation.

The additional features help create a more detailed profile of customers and verify key details, improving data accuracy and customer insights. The service is fast, efficient, and integrates seamlessly into our systems. Their continued innovation and excellent support make them a valuable partner. If you're looking for address verification and customer data enrichment solution, Postcoder.com is a top choice. Highly recommended! Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

It would be great if the pricing on other items was for rounded credit not like 2.4 credits for a mobile look up. other than that its great. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

edit

Hi, thanks so much for your positive feedback; we're really pleased you're taking advantage of some of our additional features and that you have found our support to be as helpful as we intend it to be. We appreciate the comment regarding the credit pricing; we did consider rounding certain credits to the nearest whole or half credit, but by keeping them rounded to the nearest decimal place it allows us to keep our prices as cost-effective for our customers as possible. We will bear it in mind for future price changes though!

paul W.

Principal Consultant

Small-Business (50 or fewer emp.)

11/7/2024

"PW Digital - Postcoder"

4.5/5

What do you like best about Postcoder?

Loved the ease of use API - also the European country support worked well Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

previous website was a bit clumsy but is now much improved Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

edit

Hi Paul, thank you for the positive feedback on the ease of API use and the quick support you received. We understand your concerns about the website navigation and will work on improving the user experience. Many thanks for taking the time to leave us a review.

Daniel H.

Senior Software Engineer

Insurance

Small-Business (50 or fewer emp.)

5/21/2025

"Quick and easy Address lookup"

5/5

What do you like best about Postcoder?

Postcoder is super straightforward to use and does exactly what I need it to—quick and accurate address lookup. The API is fast and reliable, and the setup was simple. Theres multiple options for address search and we are able to experiment with different options. The documentation was easy to follow and included everything I needed Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Only thing to raise would be making it easier to do admin things like managing users. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

edit

Thanks so much for your review; we're really pleased you've found Postcoder reliable, easy to use and flexible to your needs. We also appreciate your feedback on managing users - our developer team are already actively working on improvements in that area but in the meantime if you have anything you need assistance with then please just get in touch and we'd be happy to help.

Mark B.

Director

Information Technology and Services

Small-Business (50 or fewer emp.)

5/20/2025

"Simple, cheap and just works"

5/5

What do you like best about Postcoder?

It has an API that's easy to use and implement, and it just works. I like the notifications that are sent so you can keep an eye on usage amount and credits remaining. Support (the couple of times I've needed it) has been great. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

I can't think of anything negative at the moment Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

edit

Hi Mark, thank you very much for your review. It’s great to know the usage notifications are helping you stay in control, and that support has been there when needed!