Complex, difficult API, slow backtesting Extremely slow backtesting and very complex APi with bad documentation - be ready to spend many hours trying to understand the overly complex API that is changing all the time. And did I mention that support costs? So if a anything is complex you won't get answers from the staff unless you PAY them. I give them 2 stars as they have reasonably reliable data. The platform itself is only worth one star. note: if you ask about slowness or any other thing negative on their forum they delete the posts.

Alex stayed the course and helped me… Alex stayed the course and helped me with an issue that turned out to be not QuantConnect’s fault. But it turns out his idea led to a resolution. Much appreciation!!!

Great technology, accessible team, invaluable supporters of the ecosystem QuantConnect has been an invaluable partner for my personal trading and for a university class that I teach. The community is incredibly supportive, and the leadership team are accessible which is almost unheard of in trading platforms these days. In my class, my graduate level students have been able to personally engage and implement constructs like Fama French factors, and QuantConnect has been an active supporter to facilitate my students learning. It's incredible to join the community, have access to a variety of detailed trading algorithms, instructional videos, and see my students feel confident implementing week-to-week. I don't think there's anything like QuantConnect out there today, and I'm a big supporter of their efforts. I can't imagine my own trading or teaching my class without it!

QuantConnect is an amazing service!!! QuantConnect provides an amazing service with their data and servers and the ability to run algorithms as if I were a hedge fund. I wouldn't be where I am without QuantConnect!!!

I have been using QuantConnect for over… I have been using QuantConnect for over a year now. I started out using their free tier, which basically lets you do everything that you need to do to get started and more (coding, backtesting, access to historical data). Due to this I was able to learn how to use platform at my own pace without feeling pressured by any fees or costs. When I first started the documentation was still pretty spotty and it was difficult at first but I have always received fast and detailed replies by their staff and other community members, they have since improved their documentation and I have improved from being a beginner on the platform to being one of the helpful community members, I couldn't be happier with how QuantConnect and my own trading journey is evolving!