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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 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.

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Verified User in Computer Software

Small-Business (50 or fewer emp.)

2/20/2026

"Fair Lookup Rates and Straightforward, Non-Pushy Sales"

4/5

What do you like best about Postcoder?

Fair rates for lookups.

Not charged for invalid lookup.

Sales people are not pushy and are to the point with pricing options etc.

Sales happy to be handled over email instead of phone calls. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Having to set up identifiers when providing the software for third parties is something we run into often. Doing this in the portal is easy enough, but it’s still tedious. It can be done through a CSV, which is nice, but I think an API link would work well too. For example, if we made a request with an identifier that doesn’t exist, we could get a response that lets us follow up with the identifier and the required details. That would make it easier to automate identifier setup when we onboard a new client. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi, thank you for your review - we're so pleased that you found our pricing fair and that our team have been responsive and supportive; this is exactly how we aim to work with our customers. We understand that the requirement to provide identifier information for third-party users is not the most convenient part of the setup. As this information is required under the Royal Mail data licence, we do need to ensure we keep accurate records, but we are always looking at ways to improve our services and hope that the option of providing details in bulk helps reduce the admin involved in the meantime.

James W.

Small-Business (50 or fewer emp.)

2/19/2026

"Quick Integration, Accurate Address Validation"

3.5/5

What do you like best about Postcoder?

I like that Postcoder was very quick and easy to integrate, especially since we needed a rapid solution to replace a provider that was no longer available. The API documentation made the process simple. It was also good value for money. Additionally, the initial setup and configuration process was quick and easy, with no complaints. The trial allowed us to do early testing and run it in production to ensure everything worked as expected before seamlessly switching from the trial to the paid plan. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

The biggest one for us right now is having to identify third party customers using Postcoder to do with their Royal Mail licensing solution. There's no API for us to sync our customer data with our customer data that needs to be in Postcoder. So it's having to be managed manually, which is not as slick or as convenient as it could be. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi James, thank you for taking the time to review us. We are so pleased we were able to fill the gap you found yourself with and that our documentation supported you through the process. We appreciate the feedback regarding the third party identifiers; since Royal Mail require us to hold user details for anyone accessing their data, we do need to collect and maintain that information, but hopefully submitting a monthly file rather than uploading individual records will make this more manageable at present. We have shared your suggestion about an API with our development team and will be sure to keep you updated if there is any progress on that front.

Adam B.

2/11/2026

"Seamless ERP Integration, Spotless Performance"

5/5

What do you like best about Postcoder?

I've been using Postcoder for over 5 years now, and it just works without any issues. It's simple to configure, and my sales and delivery team use it daily without even realizing they're using it. I really appreciate its ability to link with our ERP system to help locate customer delivery addresses accurately. The accuracy is crucial for providing great customer and delivery service. The initial setup was very easy, taking only about 20 minutes, including setting up the account. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

nothing, its perfect Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi Adam, thank you for the fantastic review! We’re delighted to hear that everything runs smoothly in the background with minimal effort on your part, and that you’re pleased with the accuracy of the data we provide. It’s exactly what we aim for, so your feedback means a great deal to us.

Anthony S.

IT Manager

Mid-Market (51-1000 emp.)

3/27/2024

"With API's its easier more than ever"

5/5

What do you like best about Postcoder?

Since we used their API's it is now even easier for anyone to be able to start using their service. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Just keep an eye on the credits - if you don't have auto topup enabled it can bring everything to a halt Review collected by and hosted on G2.com.

Response from Garrie Clayton-Flatt of Postcoder

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Hi Anthony, we really appreciate your feedback and are glad to hear that you found Postcoder a simple API to integrate into your CRM, and that by using it you benefit from not needing to update or host data yourselves.

Pete L.

Small-Business (50 or fewer emp.)

8/30/2024

"Postcoder is a game changer!"

4.5/5

What do you like best about Postcoder?

Postcoder is great to use in a busy and bustling environment like ours. Instead of the tedious task of having to type customer's full addresses out, all is required is a postcode and door number, job done! Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Nothing i would currently change about 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 you find Postcoder fast and simple to use! Thank you for sharing your positive experience with us.

Theodore W.

Senior Product Manager

Mid-Market (51-1000 emp.)

7/31/2025

"Postcoder is a great address search API — well-built, cost-efficient, scalable, with great support."

5/5

What do you like best about Postcoder?

Postcoder offers an excellent developer experience — the documentation, examples, and support are all well delivered. The API security is thoughtfully designed, with fine-grained controls for rate limiting, domain restrictions, emailed alerts and more. Usage metrics and detailed logging are also very helpful — overall, it’s a highly developer-friendly platform.

For our user experience, the address searches are near-instant, creating a light-touch, frictionless journey for our customers. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Very little to dislike about Postcoder. One minor detail was the use of non-standard country codes for defining address searches — but the service desk was very helpful, quickly providing the correct codes, and the issue was resolved within 20–40 minutes. Review collected by and hosted on G2.com.

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

Postcoder supports both our internal and external user experience by enabling fast and accurate address entry through its address search and email verification features. This speeds up data input and ensures consistent, verified data — which is essential for reliable reporting and operational accuracy. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Thanks for your review, Theodore! We're delighted that you were impressed by our support team and that the service is as speedy, accurate and worry-free for you as we have designed it to be.

For the benefit of other readers: Postcoder supports two-character ISO country codes and accepts both UK and GB (the official code) for UK address lookups.

Stephen M.

Operations Director

Small-Business (50 or fewer emp.)

2/23/2026

"Postcoder Address Verification"

5/5

What do you like best about Postcoder?

The pricing structure was easy to understand. The API integration was straightforward with our custom CRM. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Nothing bad to report at this time, all good. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi Stephen, thank you for such a straight to the point and positive review. We are pleased to hear that you found the pricing clear and the API simple to work with. It is also fantastic to know that Postcoder has been a strong step up for you. We really appreciate you choosing us and taking the time to share your experience.

Verified User in Construction

Mid-Market (51-1000 emp.)

7/15/2024

"Accurate data and good API"

4.5/5

What do you like best about Postcoder?

Up to date Royal Mail database which ensures accurate addresses. API is modern and developer friendly Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

More expensive that some other competitors, though it does tick more boxes than competitors Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Thank you for sharing your experience. We're glad to hear that you find our API easy to work with and that it helps you maintain compatibility with your 3PL suppliers. We understand your concern about pricing, we do our best to ensure our pricing provides value for our customers whilst also providing the most accurate data updated daily.

Gemma D.

Director

Small-Business (50 or fewer emp.)

2/11/2026

"Easy Account Setup and Responsive Support"

5/5

What do you like best about Postcoder?

Ease of setting up our account and response to support requests Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

I didn't experience any issues with Postcoder and happy with cost Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi, thank you so much for your positive words. We're so glad that you found everything straight forward when creating your account and that our support team have been responsive to your requests; it is always our aim to make things as simple as possible and give any help that we can.

Tim H.

Director

Small-Business (50 or fewer emp.)

6/11/2025

"Been using Postcoder for years and it works great for us and our customers!"

4.5/5

What do you like best about Postcoder?

Postcoder just reliably works in the background, giving our customers easy and reliable data so they can check out quickly and we get accurate data then for our delivery partners. It was easy to set up and never seems to be out of action or need amendments from us leaving us free to get on with what we need to do in other areas of the business! Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Cant think of any to be honest! Maybe a small monthly fee option would be better than periodic top ups? Review collected by and hosted on G2.com.

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

It helps us by making checkout easier for our customers therefore increasing the likelyhood of spending with us. It also helps us get consistent address data for our delivery partners meaning they are less likely to have address issues meaning missed deliveries and upset customers and increased work load for our customer service team. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi Tim, thank you for your loyal support and for sharing such positive feedback — it’s great to hear Postcoder is making a real difference for both your customers and your team. We appreciate your suggestion about a monthly fee option for smaller use customers and I will pass this onto the team for consideration.