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Fast UK address, email & phone validation APIs for developers. Official Royal Mail PAF data. Pay as you go, 100 free lookups.

Which is more popular?
Based on our record, Buffer seems to be more popular. It has been mentioned 61 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | postio.co.uk | buffer.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from the United Kingdom · 1 - 9 employees | Startup from the United States |
| Listed in |
In their own words, as submitted to SaaSHub.


Postio (postio.co.uk) is a developer-focused data validation platform providing real-time UK address lookup, email verification, and phone validation via plain REST APIs and drop-in SDKs. As an official Royal Mail PAF Solutions Provider, Postio synchronises 30M+ UK addresses daily for accurate...
No description of Buffer yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Postio.co.uk yet.
Overall verdict
Why this product is good
Recommended for
Buffer is recommended for small to medium-sized businesses, digital marketers, social media managers, and individuals who need to manage multiple social media accounts. It's also well-suited for teams looking for collaboration tools to improve their social media marketing workflow.
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Hootsuite VS Buffer VS Later 2019 | 3 Best Social Media Schedulers
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Postio.co.uk and Buffer.
Postio.co.uk's answer
Postio charges only when a lookup returns a result — searching is free. Address, email and phone validation sit behind one API with a single JSON response envelope, so you integrate once rather than stitching three vendors together. Address data comes from Royal Mail's Postcode Address File under a direct licence, not scraped or resold sources. There are no tiers, contracts or minimum spend, and the first 100 lookups need no card.
Postio.co.uk's answer
A REST API served from edge locations, with official SDKs for JavaScript/Node, Python, Go, PHP, Ruby and .NET, all open source on GitHub. The API is documented by a public OpenAPI specification.
Postio.co.uk's answer
Pricing is published and pay-as-you-go: 2.2p per address, 1p per email, 1p per phone, billed only on a result. No sales call, no annual contract, no minimum commitment. You can be live in a few minutes with 100 free lookups and no card, and the same API covers all three validation types. For UK addresses specifically, the data is licensed directly from Royal Mail rather than obtained second-hand — which matters after the 2025 High Court ruling on database rights in this market.
Postio.co.uk's answer
Developers and technical teams building UK-facing forms — ecommerce checkouts, signup flows, CRM and logistics systems. Typically small to mid-sized product teams, agencies building for UK clients, and software vendors embedding address lookup in their own product. It suits anyone who wants a UK-accurate API without an enterprise procurement process.
Postio.co.uk's answer
Postio is a trading name of Onno Group Limited, registered in England & Wales (company no. 08622799). It was built to make Royal Mail PAF-accurate UK validation available on straightforward pay-as-you-go pricing, rather than the contracts and minimum commitments that have been standard in this market. Address, email and phone validation were brought together behind one consistent API so a team can solve all three at once.
Postio.co.uk's answer
Serving a huge range of customers across the world looking for a blazing fast UK Address AIP product. From bootsrapped entrepreuners to FTSE 250 companies. We serve them all.
Share your experience with using Postio.co.uk and Buffer. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


We have no reviews of Postio.co.uk yet. Be the first one to post
A scheduler publishes pins you have already designed and written, at the times you choose: Buffer, Later, Planoly, Hootsuite and Pinterest's own scheduler work this way. An automation tool also makes the pins: it...
Buffer is the friendliest scheduler here, and its free plan (3 channels, 10 scheduled posts each) is enough to try Pinterest scheduling properly. It treats Pinterest like any other network, though: no board sections,...
Buffer starts at the composer: you bring a finished post, and Buffer queues it across social networks with an AI assistant that helps rewrite captions. Its scheduler is mature and its analytics are straightforward. It...
Recommendations tracked on public social media and blogs since March 2021.


Tracking Postio.co.uk since Aug 2026.
I started with Buffer since everyone knows the name. It has been around forever as a scheduler, and now it has a newer GraphQL API that replaced the older, more limited one. - Source: dev.to / 4 months ago
We could have built full autopilot â generate, schedule, post, done. Tools like Buffer and Hootsuite give you scheduling. Some newer tools now offer auto-posting. We deliberately didn't go that route for the first version, and the... - Source: dev.to / 6 months ago
The concept is simple but technically ambitious. We are going to execute a strategy of "dogfooding" (eating our own food). Instead of using third-party tools like Buffer or Hootsuite, we will build a custom distribution engine using the... - Source: dev.to / 10 months ago
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