---
title: Postio Reviews
meta_title: 'Postio Reviews 2026: Details, Pricing, & Features | G2'
meta_description: Filter reviews by the users' company size, role or industry to find
  out how Postio works for a business like yours.
date_modified: '2026-08-18'
parent_category:
  name: IT Infrastructure
  url: https://www.g2.com/categories/it-infrastructure
---


# Postio Reviews
**Vendor:** Onno Group  
**Category:** [Address Verification Tools](https://www.g2.com/categories/address-verification)
## About Postio
Postio is a suite of UK data validation APIs designed to assist developers in verifying addresses, emails, and phone numbers efficiently. The platform offers three primary services: address lookup, email validation, and phone validation, each tailored to meet the specific needs of applications requiring accurate and up-to-date data. The address lookup API provides comprehensive coverage of the UK's Postcode Address File (PAF), encompassing approximately 30 million addresses. By inputting a postcode, users receive a structured address output, ensuring data accuracy and consistency. This service is synchronized nightly with Royal Mail, guaranteeing that the address data remains current. The email validation API performs multiple checks to ascertain the validity of an email address. It examines the syntax, verifies MX records, conducts SMTP handshakes, and detects disposable email addresses. Additionally, the API offers typo suggestions, such as correcting 'gmial' to 'gmail', enhancing data quality and reducing the likelihood of errors. The phone validation API focuses on UK phone numbers, normalizing them to the E.164 international standard. It identifies the type of line—mobile, landline, VoIP, or non-geographic—and provides information on the original and current carriers. This service also indicates whether a number has been ported and assesses its reachability, offering valuable insights for applications that rely on accurate phone data. Integration with Postio is streamlined through its RESTful API, accompanied by official SDKs for various programming languages, including Node.js, Python, PHP, Ruby, Go, and .NET. For client-side applications, Postio offers a browser SDK that enables UK address autocomplete functionality with minimal setup. Additionally, the platform provides plugins for popular platforms such as WordPress, Shopify, and WooCommerce, facilitating seamless integration without extensive coding. Postio operates on a transparent pricing model, charging a flat rate per request without tiers, minimums, or annual contracts. Users can prepay with any card, starting from £10, and each request is debited as it occurs. The platform offers 100 free lookups to new users, allowing them to evaluate the services before committing financially. Data security and compliance are central to Postio's operations. The platform is hosted in London, ensuring that address and email data remain within the UK, while phone checks utilize an EU carrier network. Postio is GDPR-compliant, with personal data obfuscated after 30 days, a retention period that can be configured per API key. As a licensed Royal Mail PAF Solutions Provider, Postio ensures that its address data is always current and reliable. Postio's infrastructure is built for performance and reliability, boasting a 99.99% uptime SLA. The platform leverages technologies such as Cloudflare, AWS, Royal Mail, Typesense, and Telnyx to deliver fast and dependable services. Real-time status monitoring provides transparency regarding system performance, with metrics such as P50 and P95 latency readily available. In summary, Postio offers a robust and developer-friendly solution for UK data validation, encompassing address, email, and phone number verification. Its comprehensive APIs, straightforward integration options, transparent pricing, and commitment to data security make it a valuable tool for applications that require accurate and up-to-date UK data.






- [View Postio pricing details and edition comparison](https://www.g2.com/products/postio/reviews?section=pricing&secure%5Bexpires_at%5D=2026-08-25+22%3A39%3A48+-0500&secure%5Bsession_id%5D=cb89bbdf-6ce1-402e-997b-a809594e5d74&secure%5Btoken%5D=f20dd6306ed91228e2a5e15881ef0cd14211a69aae342fa362f469c967a7cb68&format=llm_user)

## Postio Features
**Management**
- Scheduled Data Checks
- Reporting

**Functionality**
- Address Verification
- Automation
- Cleansing
- International Verification

**Additional Functionality**
- For eCommerce
- Third-Party Integrations
- Location Tracking
- Automatic Formatting
- Generative AI
- Contact Database
- Data Security
- Metadata Management
- API
- AI/Machine Learning
- Search/Filter
- Contact Management
- Proof of Delivery
- AI Copilot
- Match & Merge
- Data Profiling
- Reporting/Analytics
- Autocomplete
- Electronic Forms
- Geolocation
- Address Validation
- Data Quality Control
- Delivery Estimate
- Data Enrichment
- Multi-Language
- Recipient Validation
- Data Discovery
- Data Import/Export
- Geographic Maps
- Compliance Management

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