VectorBT vs Backtesting.py (2026)
VectorBT (high-speed vectorized python backtesting library with a free core and paid pro tier) and Backtesting.py (lightweight open-source python library for backtesting single-instrument strategies) solve backtesting differently. The table below compares them on verified specs and pricing; full details are in each review.
Side by side
| VectorBT | Backtesting.py | |
|---|---|---|
| Overall score | 7.8 / 10 | 7.1 / 10 |
| Engine type | vectorized | hybrid |
| Pricing model | freemium | open-source |
| Free tier | Yes | Yes |
| Entry price | $0 | $0 |
| Languages | Python | Python |
| Asset classes | stocks, ETFs, crypto, forex, futures, any OHLCV/tick time series | stocks, forex, crypto, futures, any instrument with OHLC(V) candlestick data |
| Bundled data | None bundled. You bring your own data: the open-source version ships a yfinance wrapper, while PRO adds unified connectors for CCXT exchanges (Binance, Bybit, KuCoin, Bitfinex), Alpaca, Interactive Brokers, Polygon.io, TradingView, Databento, Alpha Vantage, Nasdaq Data Link, plus local CSV/HDF5/Parquet/Feather and ArcticDB/DuckDB/PostgreSQL storage. | None beyond bundled sample datasets (GOOG daily, EURUSD intraday) used in tutorials. You bring your own OHLCV data as pandas DataFrames from yfinance, ccxt, broker APIs, or paid vendors |
| Finest resolution | tick | Any OHLC bar interval you supply, including sub-minute bars; raw tick or order-book data must be resampled to candles first |
| Live trading | No | No |
| Options support | No | No |
| Open source | Yes | Yes |
VectorBT
High-speed vectorized Python backtesting library with a free core and paid PRO tier
Backtesting.py
Lightweight open-source Python library for backtesting single-instrument strategies
Frequently asked questions
Is VectorBT better than Backtesting.py?+
They target different users. VectorBT: python-fluent retail quants who want to screen thousands of strategy variants fast, and who will trade a hard learning curve and diy execution for near-c research speed. Backtesting.py: beginner-to-intermediate python traders who want the fastest path from strategy idea to a credible single-instrument backtest with interactive charts, without paying anything or learning a heavyweight framework. Our scores: VectorBT 7.8/10, Backtesting.py 7.1/10.
Which is cheaper, VectorBT or Backtesting.py?+
VectorBT entry pricing: $0 (freemium). Backtesting.py: $0 (open-source). See each review for full verified pricing tables.
Educational content only, not investment advice. Specs and prices come from each platform's official pages; see the individual reviews for sources and last-verified dates.