Iris mini is something like Iris, but portable and with size of 10MB. It’s free, but has pro version with more options and hidden features for 7$ lifetime license. If you are not sure what to use, use Iris mini.
Iris is software for eye protection and it has many options and all the innovations I make. It’s size after installation can be more than 100MB, but this is normal. Use Iris if you are really serious about your health and play with the options. It’s free, but there are many advanced settings which can be purchased for 15$ lifetime license.
Iris micro is for programmers and people who understand the system and basically don’t like Iris. It’s really simple program for blue light reduction and software brightness which can be hacked a lot. It’s also free.