We present Parakeet, a system for continuous speech recognition on mobile touch-screen devices. The design of Parakeet was guided by computational experiments and validated by a user study. Participants had an average text entry rate of 18 words-per-minute (WPM) while seated indoors and 13 WPM while walking outdoors. In an expert pilot study, we found that speech recognition has the potential to be a highly competitive mobile text entry method, particularly in an actual mobile setting where users are walking around while entering text. Author Keywords Continuous speech recognition, mobile text entry, text input, touch-screen interface, error correction, speech input, word confusion network, predictive keyboard ACM Classification Keywords H5.2. User Interfaces: Voice I/O