VectorBT vs Composer (2026)
VectorBT (high-speed vectorized python backtesting library with a free core and paid pro tier) and Composer (no-code platform for building, backtesting, and auto-trading rules-based strategies) solve backtesting differently. The table below compares them on verified specs and pricing; full details are in each review.
Side by side
| VectorBT | Composer | |
|---|---|---|
| Overall score | 7.8 / 10 | 6.2 / 10 |
| Engine type | vectorized | visual/no-code |
| Pricing model | freemium | freemium |
| Free tier | Yes | Yes |
| Entry price | $0 | $0 |
| Languages | Python | No-code visual editor, Natural language (AI strategy generation), Composer API / MCP (language-agnostic, symphonies as structured scores) |
| Asset classes | stocks, ETFs, crypto, forex, futures, any OHLCV/tick time series | US stocks, ETFs, Crypto (state-eligible, via Alpaca Crypto), Options (covered calls & cash-secured puts, launched Dec 2025) |
| 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. | Bundled daily adjusted-close history for US stocks/ETFs (split/dividend adjusted) plus crypto; no separate data subscription or fees; historical depth varies by symbol and is not officially documented |
| Finest resolution | tick | Daily. Backtests run on daily adjusted closing prices only; live strategies execute in a daily trade window with real-time quotes |
| Live trading | No | Yes |
| Options support | No | Yes |
| Open source | Yes | No |
VectorBT
High-speed vectorized Python backtesting library with a free core and paid PRO tier
Composer
No-code platform for building, backtesting, and auto-trading rules-based strategies
Frequently asked questions
Is VectorBT better than Composer?+
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. Composer: hands-off retail investors automating daily-rebalanced etf/stock rotation strategies without code. not for intraday traders or research-grade quants. Our scores: VectorBT 7.8/10, Composer 6.2/10.
Which is cheaper, VectorBT or Composer?+
VectorBT entry pricing: $0 (freemium). Composer: $0 (freemium). 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.