QuestDB

Open-source time-series database

QuestDB is an open-source time-series database built for low latency on open data formats. One SQL engine covers messaging, stream processing and tiered storage, so a team can take in millions of events each second, compute on live data within milliseconds and keep years of history available for queries. Trading firms, exchanges, hedge funds, tier-1 banks, crypto platforms and energy operators on four continents run it in production, and it is moving into robotics, aerospace and physical AI. The open-source repository has more than 17,000 GitHub stars. QuestDB was the first non-legacy vendor named Best Trading Analytics Platform at TradingTech Summit Europe, and two of its engineers placed in the top ten of the One Billion Row Challenge.