Developers & APIs

Welcome to the Critico Developer Centre

Make the connection to Critico’s award-winning messaging gateway. Today’s technology offers a huge choice of communication methods, delivered through a wide variety of different devices. The challenge facing most organisations is how to make all these devices interact smoothly and effectively.

Hundreds of organisations across the UK already use our award-winning ‘Oventus’ messaging platform to deliver high-capacity, multi-channel mobile messaging for their businesses. Network independent, Oventus enables seamless integration of text and voice messaging to global GSM networks, landlines, UK pager networks and web/email enabled applications.

With connectivity APIs such as REST, SOAP/XML, SMPP, SFTP, SMTP and SNPP protocols, Oventus supports a wide range of message input sources – from dial-up, IP and on to sophisticated XML solutions for web and desktop messaging applications.

Web/Application APIs

If you are building messaging into a web application, our RESTful API will provide secure, 2-way messaging to mobiles, using standard post and get requests.

New: You can now look up device location information!


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A secure and easy to use protocol that is also universally accepted. Using SCP, this protocol provides reliable access for sending pager and SMS via the Oventus messaging gateway.


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Our most powerful integration option for developers wanting to build messaging into their applications. For fast, secure, 2-way messaging to pagers, 2-way pagers and mobiles. Supports voice and geolocation services.


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Specialist Protocols

SNPP offers organisations a simple yet reliable way to send both paging and SMS messages via an existing internet connection.


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SMPP is a binary protocol that can be used by clients to connect to the Critico SMSC. It is only recommended for customers with SMPP experience or who have services/applications that are already SMPP enabled.


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Desktop Application

Our Excel Add-in enables you to send text messages direct from your Excel worksheets, ideal if you need to extract large volumes of contacts from within worksheets.


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Add our SMS service to Microsoft Outlook and send SMS as easy as you can send email – it couldn’t be easier to provide SMS messaging to your workforce.


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SMTP is the simplest way of sending & receiving pager and mobile messages. Simply configure your existing mail clients or server.


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Critico operates under a Consumer Code of Practice approved by Ofcom & Comreg, assuring transparency in our products, services, and customer care policies. Additionally, our Standard Tariff is available for your reference.

Communication without compromise.