Mix and Match are tools to support experimental research. Mix is a Windows program that can generate pseudorandomized orders according to complex, user-specified constraints. Mix can be used to generate a novel item order for each individual participant, even for complex experiments in which stimulus and/or response repetition is an experimental variable of interest, or for which automated randomization would not normally be possible. The program also contains a number of other practical features for generating files for use with a variety of experiment control software. Use is limited to academic or other nonprofit applications. Matching large groups of items or participants on multiple dimensions is a difficult and time-consuming task, yet failure to match conditions will lead to suboptimal experiments. Match automates this process by selecting the best-matching items from larger sets of candidate items. In most cases, the program produces near-optimal solutions in a matter of minutes and selects matches that are typically superior to those obtained using hand matching or other semiautomated processes.