Best Monte Carlo Tools for Investing

FX Replay

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FX Replay is a browser-based manual backtesting and bar-replay platform for traders practicing forex, futures, crypto, commodities, and related multi-asset setups. It is strongest for discretionary strategy practice: replay sessions, multi-chart layouts, multi-pair testing, journaling, checklists, Monte Carlo, risk-reward simulation, CSV imports, and economic-calendar context help traders review execution without connecting a live broker. It is not an automated strategy engine, and seconds-level data plus broader asset coverage are Pro-gated.

Marketlog

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Marketlog is a web and mobile portfolio tracker for retail investors and active traders who want manual or broker-connected portfolios, dividend tracking, goals, target allocation, benchmarking, forecasts, alerts, market pages, calendars, and public or private portfolio sharing. It is useful for monitoring holdings and portfolio behavior across asset types, especially when users want mobile access and community portfolio browsing. It is not a broker, exchange, fiduciary, investment adviser, or public market-data API.

MarketXLS

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MarketXLS is an Excel-first market data, options, portfolio analytics, screening, and template add-in for investors who want live or delayed financial data directly inside spreadsheets. It is useful for Excel-heavy workflows covering stocks, ETFs, options, mutual funds, crypto, forex, fundamentals, FRED economic data, ETF holdings, portfolio templates, and broker order-ticket integrations. It is not a redistributable market-data API: real-time coverage is tiered, some exchanges require add-ons, and licensing is personal-use oriented.

okama

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okama is a free open-source portfolio analytics toolkit with web widgets, a REST API, and a Python library for efficient frontiers, risk metrics, Monte Carlo simulations, cash-flow modeling, and historical market or macro data. It is best for technical users who want reproducible analysis rather than a consumer portfolio tracker.

Orion Advisor Tech

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Orion Advisor Tech is enterprise infrastructure for RIAs and wealth firms that need portfolio accounting, billing, reporting, tax-aware trading, CRM, planning, compliance, risk analytics, client portals, APIs, and data infrastructure under one operating stack. Public stack pricing starts in the five figures per year and module access depends on the selected Orion Stack or standalone products. It is not a self-serve portfolio tracker, consumer research app, discount broker, or low-cost tool for individual investors.

Portfolio Visualizer

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Portfolio Visualizer is a web-based portfolio analysis suite for backtesting portfolios, testing asset allocations, running Monte Carlo simulations, optimizing allocations, analyzing factors, checking correlations, and researching funds. It is strongest for DIY investors, analysts, and advisors who want evidence for allocation, withdrawal, and risk decisions without building every model in spreadsheets. The free tier is useful but constrained, while Basic and Pro add larger portfolios, YTD results, saving, imports, exports, and commercial-use support on Pro. It is not a broker, live portfolio accounting system, or automatic rebalancing platform.

ProjectionLab

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ProjectionLab is a web-based financial and retirement planning simulator for mapping income, spending, investments, major life events, financial independence, and estate outcomes over time. Users can compare what-if plans, run Monte Carlo simulations and historical backtests, and inspect annual cash-flow and estimated-tax results. The free Basic plan covers forecasting and core simulations; Premium adds deeper cash-flow, tax, withdrawal, reporting, and multi-plan tools, while Pro adds client management for advisors and coaches. It is a manual planning model, not a live account aggregator, brokerage, or substitute for professional advice.

Stock Rover

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Stock Rover is a web-based stock, ETF, fund, and portfolio research platform for investors who want 800+ financial metrics, 20 years of historical fundamentals, deep portfolio analytics, dividend tracking, automated DCF-driven intrinsic value and Margin of Safety tools, printable research reports, stock ratings, broker-linked portfolios, and alerts. It is strongest for North American fundamental research and portfolio management, not for trade execution or full strategy backtesting.

Wealthfolio

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Wealthfolio is a free, open-source, local-first portfolio and personal-finance app for investors who want holdings, performance, allocation, income, net worth, spending, goals, rebalancing, and retirement planning in a SQLite database they control. It runs on macOS, Windows, Linux, and iOS or as a self-hosted web app. Optional Wealthfolio Connect plans add encrypted device sync and read-only brokerage imports, while manual tracking and CSV import remain free without an account.