Thanks for this. I think that I may go with a single, large database (either OQMD or Nomad). Right now, all I really need is a long list of formulas for which there might be interesting compounds related to our target property. It would be best for me to have the formation energy since eventually, we’d like to try to make some of the more promising compounds experimentally and characterize them. I’m also realizing that with ~3 million entries in Nomad, there’s a good chance that all of the other databases have significant overlap (for example, ones with a few thousand formulas might be completely represented in NOMAD in terms of chemical formulas), and it may not be worth the effort (at least for now, for me) to try to get a list of “every chemical formula that’s ever been put into a materials database”.