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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 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.

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Verified User in Retail

Small-Business (50 or fewer emp.)

7/15/2024

"Simple to integrate API with consistent results"

4/5

What do you like best about Postcoder?

Integration was straight forward with well written documents so implementation was quick. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

You need to think through options to validate user inputs to minimise lookup costs. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

edit

Thank you for your review. We're glad to hear that you found our API easy to integrate and that our documentation was helpful.

Verified User in Performing Arts

Small-Business (50 or fewer emp.)

9/4/2024

"The api work but pricing structure could be better"

2.5/5

What do you like best about Postcoder?

Support is via email and is quick and reponsive Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

The pricing could be better and I don't like that my credits have only a limited lifetime. As a low volume user I feel this is unfair. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

edit

Hi, thanks for taking the time to share your thoughts. We understand your frustration with the 12 month lifetime of credits, especially as a low volume user. We will take your feedback into account as we evaluate our credit policies. If you'd like to chat to our Sales team to ensure you're on the most cost-effective plan for your usage please get in touch at sales@alliescomputing.com.

David M.

Head of Ecommerce

Small-Business (50 or fewer emp.)

5/30/2024

"Great service, works flawlessly."

5/5

What do you like best about Postcoder?

Really simple to use, plug and play with the API, never have any issues with it. Easy to setup and integrate and fantastic customer support. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

It could be a little cheaper for the amount we are processing each month. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

edit

Hi David, thanks for taking the time to review Postcoder, we're glad to hear you've found Postcoder so simple to use. We're always keen to get our customers on the most cost effective plan for their usage, so feel free to contact our sales team on sales@alliescomputing.com to check you're on the best plan for your usage.

Hines J.

Software Engineer

Information Technology and Services

Small-Business (50 or fewer emp.)

3/2/2024

"Improve your user experience of your Apps with Postcoder."

5/5

What do you like best about Postcoder?

After integrating Postcoder API in our apps when a user inputs his/her partial address, its geocoding functionality and mapping services suggest and autocomplete the user's full address which gives a great user experience in the application. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Postcoder APIs charges more money than expected because the costing depends on how much we utilise its services. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

edit

Thanks for your review! It's great to hear that Postcoder is helping to improve the accuracy of address data input in your apps. We are committed to providing reliable address validation and geocoding services. We aim to keep our pricing competitive, and our sales team are always happy to ensure you're on the most cost-effective plan for your usage.

Dan B.

Enterprise (> 1000 emp.)

2/22/2024

"Simple and super"

5/5

What do you like best about Postcoder?

A simple and effective user interface combined with some good prices and excellent customer service. Would highly recommend. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Continue to evolve the UI to help with insights on usage and simplicity. Only small things are great platform. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Dan, we appreciate your feedback and are glad to hear that you find Postcoder simple and effective. We are constantly working on improving our user interface to provide better insights and simplicity. Thank you for your input!

Verified User in Internet

Small-Business (50 or fewer emp.)

6/4/2024

"Fast and efficient with good security"

5/5

What do you like best about Postcoder?

The API are extremely fast and there's lots of control to prevent fraud Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

It's a bit expensive but seems to be within industry standard Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

edit

Thank you for the positive feedback! We're committed to providing a fast and secure API with comprehensive fraud prevention controls. We appreciate your understanding of the pricing, and we aim to deliver a service that brings value to our users.