The CATE2 Mobile Recorder App of The Association of British Fungus Groups is a brilliantly designed data recording programme, tailored to meet the needs of field mycologists. With easy exchange to and from the main CATE2 online database, it provides all the necessary resources for field recording. CATE2 is the main UK resource of fungus records, called on by the major UK conservation bodies. The app is available free-of-charge to accredited users, by application to the ABFG.