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Postcoder Reviews & Product Details

Postcoder 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.

TH

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.

JR

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.

JF

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.

JG

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!

UC

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!

DH

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

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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.

MB

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

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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!

AA

Verified User in Accounting

Small-Business (50 or fewer emp.)

5/27/2025

"It just works for us!"

5/5

What do you like best about Postcoder?

Postcoder is simple, reliable and cost effective. It just works. The only time I have to think about is, is to add credits :) Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

We're using postcoder for a long time now, i'd like that if we ever run into an insufficient credit issue - it will add some to keep us going until it gets resolved. This has only happened once in 5 years. Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi, thank you for the great review — we’re delighted to hear Postcoder has been a reliable and cost-effective solution for you over the years. Just so you know, we do offer an auto top-up feature to help prevent credit issues, and we’d be happy to help you get that set up so please just get in touch.

UR

Verified User in Retail

Mid-Market (51-1000 emp.)

2/18/2025

"Postcoder delivers accurate data, great support, and a smooth experience"

5/5

What do you like best about Postcoder?

We tried a number of different address lookup services before deciding to go with Postcoder.

Not only did we receive the most accurate address and location data from postcoder, but the help we received from the support team (especially Kit) and the easy to navigate admin portal made it an easy decision.

The API is fast to respond to requests. We haven't had any issues since switching to Postcoder Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

If I had to point out a downside, it would be that we didn't have enough credits to for our testing, so we had to request more. However the support team was quick to fix this issue for us Review collected by and hosted on G2.com.

Response from Rachel Potter of Postcoder

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Hi, we're delighted to hear that you're pleased with the accuracy of our data and the level of service we provide. And thank you for your feedback about the credits available for testing; we will take that into consideration when we review this process.