This work provides a uniquely comprehensive and comparative overview of probe sources and targets. This will be maintained and expanded for experts and non-informaticions seeking probes to use in their work. Although our results are presented in good faith, we understand the causes of fuzziness (some of which have been discussed) that caution against these numbers being taken as ground truth. Notwithstanding, we have analysed 940 experimental and 3,670 calculated probe candidates. Together these have evidence of specific binding for 796 human proteins across the target classes. We have flagged unsuitable (i.e. potentially misleading and resource-wasting) compounds from both probe groups. Compared to ChEMBL approved drugs, probes tend to be larger and more complex structures.