When Siri arrived on the iPhone 4S it seemed like a magic piece of software. The future had arrived. But it wasn’t alone. True Knowledge, a British startup with a natural language search engine developed in university labs, had been working out what to do next. Siri was the ‘boom’ moment. They licensed Nuance’s voice recognition technology and created an app based on the True Knowledge engine, called Evi, which worked on any iPhone and Android. That clever move looks like it paid off. TechCrunch understands from sources that the company has been sold to Amazon for $26 million. However, calls to Amazon PR, backers Octopus Ventures and the founders of Evi have ben met with a stoney silence. A spokesperson for Octopus told us: “On this occasion Octopus will decline to comment on this specific portfolio company.”