Postcoder Reviews & Product Details

Postcoder is a powerful API that brings fully integrated validation features to your customer onboarding forms, helping you capture accurate customer data while boosting form completion rates. Features include: - Address lookup: Capture addresses 5x faster with zero typos - Bank validation: Verify bank accounts for direct debits and money transfers - Email and mobile validation: Capture valid contact details from your customers - OTP verification: Protect customer accounts with one-time password SMS verification Over 9,000 organisations across the UK and globally trust Postcoder to enhance customer onboarding by improving data quality while reducing friction at critical touchpoints. Postcoder provides everything your business needs: - Enterprise-grade performance - ISO 9001 certified - PCI-DSS and GDPR compliant - Dedicated specialist for onboarding - 24/7 response for critical issues - Free multi-channel support Start capturing clean, verified customer data effortlessly while reducing drop-offs and errors. Add Postcoder to your forms today and transform your onboarding journey.

Product Website

Seller

Allies Computing

Discussions

Postcoder Community

Languages Supported

English

Product Description

Postcoder is the API for address lookup and form validation. Create a quick and accurate data capture experience for your websites and apps.

Overview by

Jasmine Robinson Madden

Pricing

Pricing provided by Postcoder.

Free trial

Free Trial

View More Pricing Information

Postcoder Integrations

(1)

Verified by Postcoder

Postcoder Media

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

Admin area on mobile and desktop.

Postcoder Demo - Postcoder rooftop geocoding

Code sample returning rooftop coordinates.

Email validation API javascript sample code from the Postcoder docs.

Mobile validation API javascript sample code from the Postcoder docs.

Postcoder Demo - Address autocomplete API

Address autocomplete API javascript sample code from the Postcoder docs.

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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.

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.

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.

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

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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

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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

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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

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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

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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

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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

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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!