AnSo is designed by anesthesiologists for anesthesiologists. Carry this resource in your pocket to help identify anatomical structures with ultrasound. AnSo allows the user to identify sonoanatomy by placing single or multiple colour overlays on and off the ultrasound images. AnSo is for more than just regional anaesthesia. It includes other perioperative uses of ultrasound such as:NervesVascular AccessAirwaysTransthoracic EchoLumbar SpineAnSo contains over 300 images and over 1400 coloured overlays. Landmarks commonly used for pattern recognition of major structures are simplified using chalkboard sketches. Short loops demonstrate some dynamic anatomical features and surface anatomy images localise probe positioning.AnSo does not require an internet connection to run. It can be useful both in and out of theatre, when performing procedures, and when learning or teaching ultrasound.The app has been designed to be easily updated with new images as perioperative ultrasound use expands, and new understanding of the sonoanatomy develops.Download AnSo today and always have easy access to sonoanatomy answers.