In FinTech


Quantopian vs QuantConnect Review

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Back-testing Platforms Coming of Age

Many years ago, one needs to build their own back-testing frameworks from scratch using languages like Matlab, R, .NET, Java etc. Then came a few open sourced community provided platforms that saved us some work. And now there are numerous platforms that are beginning to democratize quant strategy research and make it easily accessible to everyone who is interested to participate.

You can see a whole lot of them mentioned in following links:

Prominent Platforms

Amongst the many available, it seems to me the most prominent 2 lately seems to be Quantopian and QuantConnect.

Why This Article?

This article was inspired by the discussions at the following post.

We decided to test drive Quantopian and QuantConnect as objectively as possible and see which one we liked more. We are not affiliated to either of them.

Overall, we are Impressed

First of all, we must say we are very impressed by:

  • The in-browser IDE provided by both Quantopian and QuantConnect. For someone with some development experience, the IDEs were very easy to pick up and understand. We are old school and nostalgic – Quantopian’s reminded us of our old emacs editor while QuantConnect’s reminds us of our Visual Studio days.
  • The very very nice ability to share strategies and clone existing strategies written and discussed in the community forums into our workspace for us to work off. These definitely helped ease the learning curve.
  • Both have engines that they open sourced (ZipLine and Lean Engine). Wow!

Here’s The Test Drive

For our test-drive, we decided to implement a toy and naïve intraday momentum strategy over 5 randomly selected US stocks at 1 minute frequency over 10 years back-test period.

  • Go long small amount of the stock if its price now is higher than 15 minutes ago.
  • No position otherwise

This means the strategy never goes short any stocks and just trades in and out of its positions and toggles quickly between being long and being flat. Not going to make us much money but simple enough to code up and generates a fair bit of trading activity to stress test the back-testing platform at the 1 minute frequency.

Time Taken To Build Simple Momentum Strategy

Quantopian’s users have to write their code in Python (based on Zipline.IO library) while QuantConnect’s users have to write their code in C#. We have comparable experience in both languages.

We spend roughly 4 hours on each platform to figure out how to build and debug our momentum strategy which came to somewhere between 50-100 lines of code. So in terms of learning curve and productivity, honestly, we thought it was really quite comparable.

Both Quantopian and QuantConnect had wonderful in browser IDE and help like intellisense.

Q vs Q 1

Q vs Q 2

Halfway coding up strategy on Quantopian

Q vs Q 3

Halfway through coding up strategy on QuantConnect

Q vs Q 4

Simulation Running!

Q vs Q 5

Here are some differences based on my experience:

  Quantopian QuantConnect Winner
Instrument Support Equities: US Only since 2002 Equities: US Only since 1998. FX Majors: since 2007 QuantConnect
Equity Fundamental Data Available from Morning Star Not available yet but I believe should be soon Quantopian
Speed of back-test (10 years intraday momentum) Tried twice and both took 16 minutes to complete. This was weird. Tried the simulation twice and in both cases at the 20 minutes mark, the simulation was only half done (completed 5 years so far).I was under the impression QuantConnect’s C# based platform should be faster than Quantopian’s Python based platform. Maybe my strategy implementation was very inefficient or leaked memory somehow? Thought should be QuantConnect but Quantopian was faster?Someone else can benchmark for me and let me know what you find
Real money trading support Yes through Interactive Brokers Yes through Tradier, Interactive and others Tie
IDE intuitiveness learning curve, documentations Love it! Love it! Tie



Both platforms are amazing. we wish we had both Quantopian and QuantConnect to choose from years ago.

If we were to choose one right now, we would have slight preference for Quantopian because:

Suggestions for both platforms

Both teams have done amazing jobs. Here are some suggestions for both:

  1. Would be nice if they support version control of strategies so we can easily compare current version of the strategy implementation with the previous one, in terms of both code differences and key profitability metrics.
  1. Really look forward to longer histories and more asset classes like Futures, FX and options etc

Hope you enjoyed our Quantconnect vs Quantopian review !

Brought to you by RobustTechHouse. We provide Fintech Development services.

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Showing 9 comments
  • Jared Broad

    Thanks for the great write up Robust Tech House! Just some fact corrections for the article:
    – QuantConnect supports FX already and can support many asset classes including futures. The open source community is already exploring these and building them privately 🙂

    – QuantConnect has version control tagged to each backtest, so you can clone an algorithm from a specific backtest.

    – QuantConnect also has all the community posts and blog articles you mentioned above and more! I’d recommend checking out the forums.

    – Our basic template benchmarks are 15x faster than Quantopian; that is the best point of comparison and is independent of any user algorithm implementation. It looks like your algorithm actually has a run-time error (red triangle). If you want help we can review your implementation.

    – We have open-source math libraries ( like MathNet.Numerics, MathNet.Filtering and AForge. They are very deep and stable. I’d highly recommend checking them out as math libraries really aren’t a factor here IMHO.

    • Matt From RobustTechHouse

      Hey Jared,

      Thanks v much. Very fair points. We will check out all these info you mentioned.

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