How do Reamer Research and Reamer Server compare with NautilusTrader?

NautilusTrader is a free, open-source trading platform with a Rust core and a Python API. It runs the same strategy code in backtest and live, down to tick and order-book data, and has ready-made adapters for many venues. Reamer Research and Reamer Server are two paid libraries for strategies on bars: a research engine with a written execution specification, and an order management engine you build your own gate and broker connector around.

What NautilusTrader is

• Open source (LGPL-3.0), with a fast Rust core and strategies written in Python.
• One engine for backtest and live. The same strategy code runs in both, which removes a whole class of differences between the two.
• Fine-grained data. Quotes, trades, bars and order books, at nanosecond resolution.
• Many venues. Adapters for crypto exchanges, Interactive Brokers, betting exchanges and others, with order management and risk checks built in.

How Reamer Labs differs

• Two products. Reamer Research is the research engine and Reamer Server takes a strategy live. Each is a library with a stable C interface, licensed separately.
• Bars, not order books. Reamer Labs targets strategies on OHLCV bars, held from minutes to days. It does not do high-frequency or order-book strategies.
• Fill rules in writing. Reamer Research fills orders by an execution specification that ships with the kit: bid and ask, spread, slippage, commission, overnight swap, margin, gaps, and what fills first inside a bar. Output is byte-identical for a fixed rng_seed.
• One call per time step. A Reamer Research strategy is called once per time step with every instrument's recent bars and positions, so a cross-sectional rule reads all instruments in one place.
• Your gate and your connector. Reamer Server supplies the order core: sequencing, order state, and a call to your pre-trade gate on every order. You write the gate's rules and the broker connector. It ships starting points in C++, Rust and Go, including a FIX 4.4 example. Strategies connect over a socket from any language.
• Research orders go live through a relay. reamer_relay_* in Reamer Research sends the same order structure a backtest uses to Reamer Server. Indicators move from a bar window to running state. See What does it take to move from Reamer Research to Reamer Server?
• A vendor behind it. A commercial licence, versioned releases and email support from the author.

Which to choose

• NautilusTrader if you trade on ticks or order books, want one codebase for backtest and live, need its venue adapters, or want it free and open source.
• Reamer Labs if you trade systematic strategies on bars, want a backtest whose fill rules you can read, and want the live side built around your own risk rules and broker connection. See Who are Reamer Research and Reamer Server for?

Price

NautilusTrader is free. Reamer Research costs $1,800 per seat per year and Reamer Server $7,200, each with a 30-day paid trial. See pricing.