Kant developed the idea of Realms; the phenomenal realm which is the world humans experience and the noumenal realm which is pure reality. He also introduced that we use reasoning to create ideas of things we cannot perceive (transcendental ideas), such as time and space. Some aspects of these views are similar, Descartes and Kant were more similar than Hume, in that they were both mainly rationalists while Hume was an empiricist. However, they all questioned how we know things are real and in what ways they deem correct. Descartes and Kant also are similar in how they both somewhat rely on reasoning to determine truth, while Kant and Hume are similar because of how they both believe we gain knowledge through experiences, in which Descartes doesn't believe.
Along with similarities come differences, these three epistemological views have several. Descartes relies heavily on God at the end of his meditations, Hume though, doesn't believe in God and doesnt base anything of the existence of a god. Hume also had the idea of tabula rosa, Kant stated that the mind is wired with universal categories not a tabula rasa. Descartes also believes that our senses cause flaws in knowledge however Kant believes our senses aid us in acquiring knowledge. Therefore, as Descartes, Hume, and Kant are similar they are also very