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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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Niamh K.

Head of Marketing and Digital Transformation (prev Head of Digital Transformation)

Mid-Market (51-1000 emp.)

7/9/2024

"Excellent product"

5/5

What do you like best about Postcoder?

It ensures that the addresses our customers enter are correct and standardised. This has drastically cut down on errors and improved our customer satisfaction. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

I haven't found any downsides to Postcoder. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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We're thrilled to hear that Postcoder has been such a valuable tool for ensuring accurate and standardized addresses for your customers. Thank you for sharing your positive experience Niamh!

Hanna E.

Brand product manager

Small-Business (50 or fewer emp.)

6/5/2024

"A complete user friendly platform for postcode lookups"

5/5

What do you like best about Postcoder?

It is very easy to install and works well with our e-commerce platform. It is user friendly and we have had no issues at all since we signed up 2 years ago Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

We haven't had any problems with Postcoder Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Thank you Hanna for your review. We're glad to hear that you found Postcoder so easy to install. We appreciate your feedback and are here to support you if you ever need assistance in the future.

Tim D.

Operations Director

Small-Business (50 or fewer emp.)

7/8/2024

"Really useful and easy to implement"

4.5/5

What do you like best about Postcoder?

We've implemented this and been using it for a number of years. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

No dislikes with the product at this stage. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Tim, thank you for your review! We're glad to hear that you find Postcoder useful and easy to implement. Thank you for your continued support over the years.

Verified User in Non-Profit Organization Management

Mid-Market (51-1000 emp.)

5/31/2024

"Excellent product. When we found a bug, they fixed it straight away."

4/5

What do you like best about Postcoder?

The Postcoder API allows us to perform address autocomplete and lookup for our users in any country with the same code. This made it quick to set up. In addition, it gives us the address unique identifiers that we need to send to our printers for mailsorting in the United Kingdom. When we found a bug in the address autocomplete endpoint for one country, the development team fixed it right away. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

It would be helpful for the documentation page to have even more examples for different countries. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Thanks for your review. We're glad to hear that you found Postcoder API helpful for address autocomplete and lookup in the UK and multiple countries. We appreciate your feedback about example code in the documentation and will work on providing more examples for different countries.

Peter B.

ICT Director

Mid-Market (51-1000 emp.)

8/27/2024

"Postcoder provides fast accurate address information"

5/5

What do you like best about Postcoder?

Customer Service is very good, always helpful in answering queries.

The API flexibility is great.

It's very fast and can provide a lot of information (using more credits) if required. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Lack of invoicing options.

Having to decide how many credits you will need/use as the expire. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Peter, we're delighted to hear that you find our customer service helpful and our API flexible and fast. We understand your feedback about the invoicing options and credit expiration, and we are committed to improving our billing system to offer more flexibility and convenience for our customers. Auto top-up might be an option that could work well for you, or monthly plans. Feel free to get in touch with our sales team on sales@alliescomputing.com to discuss which option best meets your needs. Thank you for taking time to leave us a review.

Martin S.

Head of Operations

Small-Business (50 or fewer emp.)

5/30/2024

"Postcoder is a first class platform for Bank Validation and Address Finder"

5/5

What do you like best about Postcoder?

The setup and configuration was easy

The Dashboard and Usage reports are easy to follow

Alerting for higher than average use is a great feature. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Nothing. It is a brilliant product.

We started out with Address Validation and then extended our usage to Bank Validation Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Martin, thanks for taking the time to review Postcoder. We're delighted to hear you find Postcoder easy to use for address and bank validation. We're also glad to hear you find our alerting system valuable. Many thanks for your positive feedback.

Verified User in Computer Software

Small-Business (50 or fewer emp.)

3/26/2024

"Seamless Integration and Great Reliability"

5/5

What do you like best about Postcoder?

Postcoder is a great tool we've integrated directly into our applications for checking addresses, emails, mobile numbers, and bank details. It's really reliable and easy to use, fitting perfectly into our systems without any hassle. Their customer support is top-notch, always ready to help if we need it, and the price is pretty good too. All in all, Postcoder makes our work a lot smoother and we're really happy with it. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

I'd say that it's worth noting that accessing additional data for addresses comes at a higher cost. Moreover, the bank verification feature, although useful, is quite basic and may not meet the needs of those seeking more in-depth financial data verification. Review collected by and hosted on G2.com.

Response from Garrie Clayton-Flatt of Postcoder

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Thank you for the kind review! It is great to hear you have found Postcoder to be reliable and easy to use. It is also lovely to hear you found our customer support top-notch - we are committed to providing an excellent service, so your feedback is much appreciated.

Verified User in Utilities

Small-Business (50 or fewer emp.)

6/3/2024

"Very Easy to work with"

5/5

What do you like best about Postcoder?

We sometimes see up to 30,000 postcode look ups in a single day. Automated, alerts when the credit balance needs topping up, view of high levels of activity. Excellent customer service - had an issue recently regarding the auto top-up and was resolved immediately without any fuss. The postcodes lists are regularly updated so we have little negative customer feedback on missing addresses. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

I only deal directly with Postcoder when something goes wrong, and nothing much does so nothing to write here. Postcode look-ups delievered via APi so very little interaction. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi, thanks for taking the time to review Postcoder and for giving us such a glowing report. We are very glad that our services have been so trouble-free for you and that you are happy with what we offer.

Keaton M.

Operations

Small-Business (50 or fewer emp.)

5/28/2024

"Everything works well"

5/5

What do you like best about Postcoder?

Works with our system (orderwise). Instant lookup just with the postcoder, so saves time having to get full details from people Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

in our system it seems to only work with UK although perahps it's possible to extend it with better integration Review collected by and hosted on G2.com.

Response from Garrie Clayton-Flatt of Postcoder

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Hi Keaton, we really appreciate your feedback and are pleased to hear that Postcoder works well with the orderwise system, and that you benefit from the time it saves your users.