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!

Recommended I have been programming on my bot for over 2 years. In the beginning it was difficult to get to know the platform because there is a lot of possibilities coming at you. But once you understand how this platform works and were to find the information. It's a pleasure to work on your bot. Pros: - Strong community that mostly answers your questions in 24h or max 48 hours. - Working locally or on the platform - Possibility of coding 100% your own strategy - Live Trading with a lot of markets (Equity, Crypto, Forex, Futures). - They listen to proposals to improve the platform and take immediate action. - If using the bronze membership your getting professional help within an hour. (It's normal they charge an amount for the professional help, nothing is free these days.) - Implementing email, sms, telegram messages, ... of the orders the bot is making. Cons: - If u have zero experience programming in Python or C# it's hard to program your own bot despite their learning center. - Maybe an app on the cellphone would be nice. So you can check your bot/code anytime you want (not would be something extra). A tip: Keep persevere once your bot is trading live it's a reward for all the hard work.

Quantconnect is a great resource for quantitative strategy deployment Quantconnect is a great resource for the deployment of algorithmic and quantitative trading ideas. Once a user is familiar with the event-driven architecture of the trading platform, bringing strategies into action which align with a trader/investor's view of the financial markets can be carried out with great efficiency. The documentation for the trading platform is comprehensive and helps with strategy tuning. Then there's backtesting and optimization which are pretty great to tinker with, amongst other resources user can interact with. Sometimes the website is slow, but never for a prolonged period, however it is still a nag. Overall, I'm delighted with the product; looking forward to more deployments and engagements with the community!

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.

Shady site Shady site not sure if the team behind are trustworthy with holding your algos data. I found other frameworks like backtrader that are easier to pick up and get working with quickly than LEAN. LEAN is poorly documenting making learning a huge hurdle. Also, I question the stability of their site because of the amount of bugs you can find in their UI and some that I encountered in plotting during backtrading. If you need an online IDE, Quantopian is far more reliable and documented and quicker to work with but still could have issues with data privacy.