Finally purchased Cozify thanks to Lähivakuutus. First impressions are that it looks very nice on paper, but it's extremely locked down.
From the forum, it seems there have been many promises on providing an open API, but so far the only solution seem to be the unofficial python API. Are there any status updates at all on this? Overall it seems that Cozify has one of the most competent hardware solutions that covers a lot of sensors, but without an API it means I can either limit myself to what the app supports, or just go with something else.