NAnateb2022·Jan 2, 2026Submission
Lean: Open source algorithmic trading engine
3 points · Open discussionQuantConnect
Lean
C#2020–2026
QuantConnect / Lean
Lean
Lean Algorithmic Trading Engine by QuantConnect (Python, C#)
3Distinct people
3Mentions
0Explicit recommenders
22.5KGitHub stars
What to know before exploring
What it is
Lean Algorithmic Trading Engine by QuantConnect (Python, C#)
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 12:54:37 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year3 dated mentions
Observed mentions: 2020-10-30 14:43:00 UTC to 2026-01-02 00:51:11 UTC.
* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2026 (partial) | 2026-01-01 00:00:00 UTC | 2027-01-01 00:00:00 UTC | 1 | 1 | 0 |
What Hacker News says
3 sourceshttps://kernc.github.io/backtesting.py/
https://vectorbt.dev/
https://github.com/QuantConnect/Lean
https://www.amazon.com/Security-Analysis-Foreword-Warren-Buf...
In Show HN: High-frequency trading and market-making backtesting tool with examplesThis isn't a Quantopian alternative, Quantopian let you write real code and automatically trade based on it. It also let you trade buckets of stocks, not just one.
This is just a very basic strategy backtester, there are plenty like it, you can find them if you Google "technical backtester" and some of the brokers (e.g. TD Ameritrade) even let you do such backtests in their platforms (e.g. Thinkscript, though that's a tad more Quantopian-like than this tool).
If you want a _real_ Quantopian alternative, look at QuantConnect [0]. Interestingly, it's .NET based and you can write C#, F#, Python or whatever you want.
And the trading engine is open-source [1] and you can run it yourself.
[0]: https://www.quantconnect.com/
[1]: https://github.com/QuantConnect/Lean
In Show HN: Backtest Trading Strategies: A Quantopian Alternative