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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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Craig F.

Employment Vetting Manager

Small-Business (50 or fewer emp.)

9/4/2024

"Efficiency at it's finest"

5/5

What do you like best about Postcoder?

Very easy to use and easy implement via integration and the response time when using the tool in real world applications is quick, effective and accurate. Customer support is very informative and quick to respond. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Nothing, the platform performs perfectly. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Craig, thanks for taking the time to leave a review. We're delighted to hear that Postcoder is performing perfectly for you and solving the problem of providing accurate postal information for DBS checks. Our team is committed to providing easy integration and fast, effective support. Thank you for choosing Postcoder!

Verified User in Information Technology and Services

Small-Business (50 or fewer emp.)

11/15/2024

"Perfect for UK postcode lookups"

4.5/5

What do you like best about Postcoder?

Easy to use API that's fast and reliable, reasonable pricing. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Email alerts for increases in usage can be overzealous (e.g. alert because a site has used 10 lookups in one day instead of the usual 1 or 2 lookups). Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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We're very pleased to hear that you find our API easy to use and reliable, and that it has been beneficial for your clients. We appreciate your feedback about the email alerts - we'll take it into account as we refine our notification system.

In the meantime, email alerts can be updated in the Postcoder Admin Area if you wish, follow Account Settings > Alerts to customise the trigger point for receiving high usage alerts. Please get in touch with our Sales team sales@alliescomputing.com if you need assistance with this.

Many thanks for taking the time to leave a review!

Will M.

IT Operations Director

Enterprise (> 1000 emp.)

5/29/2024

"Straightforward and easy to use"

4/5

What do you like best about Postcoder?

The dashboard is a clean dashboard, clearly shows the usage of the credits. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

The date selection of the usage dashboard is not that intuitive, it took me a couple of goes to work out how to select a start and end date, but that may be just me.

Also, the show all requests drop down seems to be showing all the same requests for each category i.e. if I select adress lookup and then select bank validation, the daily numbers are the same - then the daily numbers are the same for the other categories such as email validation, OTP validation etc. Review collected by and hosted on G2.com.

Response from Garrie Clayton-Flatt of Postcoder

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Hi Will, many thanks for your feedback. Your comments really helps us to continually improve our services, so are very much appreciated.

Edit - 31/05/2024: Hi Will, you will be pleased to hear we have now resolved the issue around the usage categories within the admin area. Please do feel free to contact me direct at garrie.clayton-flatt@alliescomputing.com should you wish to discuss this further or if you have any further comments regarding the admin area.

jack c.

Administrator

Maritime

Mid-Market (51-1000 emp.)

9/3/2024

"Easy to use and works very well"

3.5/5

What do you like best about Postcoder?

ease of use and simple layout. the overall system is very good and fits the requirments of our company perfectly Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

can feel a bit limited in options but this is mainly due to the size of our business and teh comparison of what we use to the offers being sold on thewebsite Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Jack, thanks for taking the time to leave a review. We're glad to hear that you find Postcoder easy to use and that it fits the requirements of your company well. If you'd like to explore additional Postcoder features, feel free to get in touch with our Sales team (sales@alliescomputing.com) who would be delighted to get you up and running.

Stuart T.

Head of Technology

Small-Business (50 or fewer emp.)

11/7/2024

"Great!"

4.5/5

What do you like best about Postcoder?

Ease of use and the fact we dont get any issues Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

None that am aware of altough discount woudl eb a benifit Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Stuart. We're glad to hear that you find Postcoder easy to use and reliable! Many thanks for taking the time to leave us a review.

Verified User in Retail

Small-Business (50 or fewer emp.)

11/14/2024

"Easy to use, reliable and quick"

4.5/5

What do you like best about Postcoder?

The excellent API documentation. They have an extensive range of API services available and the implementation is easy with their accurate documentation Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

I've never liked the credit package model, having to buy a specific amount of lookups in advance. A pay for what you use monthly billing cycle would be far better Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Thank you for the positive feedback on our API documentation and services, we're particularly pleased to hear you find our documentation accurate and useful. We appreciate your input on the credit package model and will consider it for future enhancements. We do have a monthly billing option, with a fixed amount of credits per month and excess use available. Please get in touch with our Sales team and they will be happy to help you get on a plan that best meets your needs. Thank you for taking the time to leave a review.

Alan B.

Head of IT Development

Mid-Market (51-1000 emp.)

5/30/2024

"Great API services from a helpful team"

5/5

What do you like best about Postcoder?

Allies provides detailed documentation for their products, which makes them easy to implement. We have had a consistent uptime whenever we have deployed a product tapping into their API, and they are used daily as part of our core business processes. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Nothing i can think of. Our account manager has always been helpful whenever I've been in touch. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Alan, thank you for recommending Postcoder! We're glad to have been able to solve the issues you faced with your previous service and provide a more efficient and cost-effective solution.

Verified User in Computer Software

Small-Business (50 or fewer emp.)

7/8/2024

"Good Experience with PostCoder"

4/5

What do you like best about Postcoder?

Postcoder is very basic and easy to use, easy to implement over other postcode searches we've used.

Any of our developers are able to pick this up and use it within our code base.

Email alerts when over credit use. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Some of the reporting is hard to read or understand. Especially the credit usage. I receive emails saying our credit usage is high but unable to see where and why easily in their reports dashboard. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Thank you for sharing your positive experience with Postcoder. We're pleased to hear that it has been easy to use for your developers and beneficial for your users. Thank you for sharing your concerns about the reporting and credit usage, and we will take this feedback into consideration for future improvements. If you'd like to speak to us directly about this, please email support@alliescomputing.com. We appreciate your support.

Grazyna W.

Finance Manager

Mid-Market (51-1000 emp.)

9/3/2024

"Great service"

5/5

What do you like best about Postcoder?

Easy to set up & easy to use. Briliant customer service. Alwasy happy to help and support. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

nothing, all good

really good service and all easy Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Grazyna, thank you for your positive feedback! We're glad to hear that you find Postcoder easy to set up and use, and that you've had a great experience with our customer service team. We appreciate your support!

Geoff C.

Sales Operations Manager

Mid-Market (51-1000 emp.)

11/14/2024

"Postcoder is easy"

4.5/5

What do you like best about Postcoder?

Easy to implement, even for a non-developer and easy to operate on site. Review collected by and hosted on G2.com.

What do you dislike about Postcoder?

Nothing that has prevented us using it effectively, to date. Review collected by and hosted on G2.com.

Response from Jasmine Robinson Madden of Postcoder

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Hi Geoff, we appreciate your review! It's great to know that Postcoder has been easy to use, particularly as a non-developer, and has helped improve the accuracy of your form submission data. Thanks for taking the time to share your thoughts.