H2ools is a MATLAB-based package containing a range of routines with the aim to analyse results from numerical simulations of fundamental combustion quantities for ammonia-hydrogen-air flames at gas turbine conditions and conduct comparisons with kerosene, so as to assist the design of zero-carbon aviation propulsion. The current version focuses on premixed systems and includes data for thermodynamic and transport properties, autoignition delay times, laminar burning velocity, nitrogen oxide pollutant formation and well-stirred reactors.