VectorBT vs Zipline Reloaded (2026)
VectorBT (high-speed vectorized python backtesting library with a free core and paid pro tier) and Zipline Reloaded (maintained open-source fork of quantopian's event-driven python backtesting engine) solve backtesting differently. The table below compares them on verified specs and pricing; full details are in each review.
Side by side
| VectorBT | Zipline Reloaded | |
|---|---|---|
| Overall score | 7.8 / 10 | 6.7 / 10 |
| Engine type | vectorized | event-driven |
| Pricing model | freemium | open-source |
| Free tier | Yes | Yes |
| Entry price | $0 | $0 |
| Languages | Python | Python (3.9+, wheels through Python 3.13 as of v3.1.1) |
| Asset classes | stocks, ETFs, crypto, forex, futures, any OHLCV/tick time series | US equities, ETFs, futures (continuous futures support), crypto/other via custom bundles and calendars (community workarounds) |
| 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. | No usable current data ships with the library. The default Quandl/WIKI bundle (via NASDAQ Data Link) covers US equities only through March 2018, so you bring your own: either the csvdir bundle, which takes OHLCV CSVs with splits and dividends, or your own custom bundle ingest code. |
| Finest resolution | tick | minute |
| 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
Zipline Reloaded
Maintained open-source fork of Quantopian's event-driven Python backtesting engine
Frequently asked questions
Is VectorBT better than Zipline Reloaded?+
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. Zipline Reloaded: python-fluent quants doing us-equity, factor-based (cross-sectional) research who want a free, realistic event-driven engine and are willing to wire up their own data pipeline. Our scores: VectorBT 7.8/10, Zipline Reloaded 6.7/10.
Which is cheaper, VectorBT or Zipline Reloaded?+
VectorBT entry pricing: $0 (freemium). Zipline Reloaded: $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.