OTKRITIE supports two trading platforms: the Open Key Platform and the QUIK Platform. The Open Key Platform is available for desktop use, and the QUIK Platform is available for both desktop (QUIK ITS) and mobile (PocketQUIK). These platforms are designed to offer flexibility for traders and investors, whether they are looking for a desktop-based solution or a mobile trading experience. However, some traders may prefer additional options like MetaTrader 4 (MT4) or MetaTrader 5 (MT5), which are not listed as supported by OTKRITIE.