Compare
LEAN engine (QuantConnect) vs NautilusTrader
Side by side from sourced facts: pricing, markets, custody, incidents and each bot’s rule-based report card. We don’t pick a winner; what fits depends on how you trade.
| LEAN engine (QuantConnect) | NautilusTrader | |
|---|---|---|
| Report card | Clear record No serious incident, regulator action or shutdown found in the sources we checked. Not an endorsement. | Clear record No serious incident, regulator action or shutdown found in the sources we checked. Not an endorsement. |
| Category | Open-source & self-hosted | Open-source & self-hosted |
| What it is | QuantConnect's open-source algorithmic trading engine (Python, C#) that you can run locally for backtests and live trading. | Rust-native, event-driven trading engine for backtesting and live trading across many venues. |
| Pricing | Free (open source). Source: github.com/QuantConnect/Lean | Free (open source). Source: github.com/nautechsystems/nautilus_trader |
| Markets / exchanges | Not verified yet | Binance, Bybit, Coinbase, Deribit, dYdX, Hyperliquid, Interactive Brokers, Kraken, OKX, Polymarket, Betfair Source: github.com/nautechsystems/nautilus_trader |
| Your money | Self-hosted: you run the software and your keys stay on your machine. | Self-hosted: you run the software and your keys stay on your machine. |
| Code / license | Apache-2.0 | LGPL-3.0 |
| Facts on record | None found in public sources. | None found in public sources. |
| Official site | lean.io | nautilustrader.io |
Facts checked Oct 15, 2026. Report cards follow published rules; payouts never change them. Not investment advice.
LEAN engine (QuantConnect) fact sheet NautilusTrader fact sheet