VOL. XCIV, NO. 247

★ A CURATED DIRECTORY OF FINANCIAL TOOLS AND RESOURCES ★

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Friday, December 26, 2025

Tool Comparison

GuruFocus vs MesoSim comparison

Compare pricing, supported platforms, categories, and standout capabilities to decide which tool fits your workflow.

Quick takeaways

GuruFocus adds Screeners, Stock Ideas, Stock Comparison, Portfolio, Investor Holdings, US Government Trades, News, Alerts, Calendar, Data APIs, IPO, Spin-offs, Acquisitions, Delisted, Dividends, GDP, Interest Rates, Inflation Rates, Unemployment Rates, Commitment of Traders (COT), Yield Curves, Financials, Scores, Valuation Models, Insider Data, Institutional Data, Short Interest, 13F, 13D/13G, ETF Overview, ETF Holdings, Analyst Forecasts, Analyst Price Targets, Analyst Recommendations, Transcripts, Education, Videos, Blogs, Forums, Newsletters, and Stock Handbook coverage that MesoSim skips.

MesoSim includes Options & Derivatives, Paper Trading, and APIs & SDKs categories that GuruFocus omits.

GuruFocus ships a mobile app. MesoSim is web/desktop only.

In depth comparison

GuruFocus

gurufocus.com

Editor’s pick Hands-on review

Global value‑investing research platform with 100k+ stocks in ~100 markets, guru & insider holdings, macro indicators and AI tools. Basic access is free with limited scanner/guru data, while Premium / PremiumPlus / Professional tiers unlock 30‑year financials, advanced All‑in‑One Screener, GuruAI, backtesting, Excel/Sheets add‑ins and increasing API query limits; a separate GuruAPI data-licensing product provides institutional datasets and pay‑per‑call or subscription access.

Platforms

WebMobileDesktopAPI

Pricing

FreeSubscription

Quick highlights

Global value-investing research platform covering ~100,000 stocks in ~100 markets plus 8,000+ institutional investors and 15,000+ mutual funds holdings, designed to provide historical financial and valuation data for long-term investors.
All-in-One Screener offers 500+ fundamental, valuation, profitability, growth, dividend, guru and insider filters, supports custom filters/formulas and screening by regions, countries, exchanges and user portfolios.
Stock pages combine up to 30-year financial statements, valuation ratios, proprietary GF Score (quality, value, growth, momentum and GF value), dividend data, ownership, operating/segment metrics, filings, transcripts, PDF reports and downloadable charts/tables.
Guru and institutional tools track portfolios and trades of thousands of investors, including real-time guru picks, 13F and 13D/13G data for all institutional investors (PremiumPlus+), mutual fund holdings, sector/geographic trends, ETF and options holdings.
Insider and politician trading trackers provide real-time insider buys/sells, clusters and combined guru+insider signals, plus a dedicated U.S. politician trading tracker with real-time picks and full politician lists.

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MesoSim

mesosim.io

Options strategy backtesting SaaS with low-code strategy definitions, observability (events log), risk graphs/Greeks, margin reporting, an options valuation model/solver, and an implied-volatility surface viewer. Plan gating: Free includes 25 runs; Standard ($1000/yr) unlocks unlimited SPX + BTCUSD/ETHUSD options backtests plus sharing/exports and 1 MesoLive paper-trading account; Advanced ($1250/yr) adds RUT/VIX/GLD, margin models, vol surface/HD risk graphs, and hourly risk traces (plus up to 2 paper accounts). Live trade execution is a paid MesoLive add-on; API access is FundPro-only.

Platforms

WebAPI

Pricing

FreeSubscription

Quick highlights

Advanced options strategy backtesting service built around a low-code workflow.
Strategy Definition schema supports multi-leg structures plus entry/exit/adjustments and simulator controls (fill model, commissions/slippage, margin, position monitoring).
TradFi instruments documented for simulation: SPX (data from 2010), RUT/VIX (data from 2012), and GLD (data from 2012), with index vs equity option modeling notes.
Published data availability + vendors and resolution (5-minute): SPX/RUT/VIX/GLD sourced from Cboe Global Markets; BTCUSD/ETHUSD (and historical SOLUSD) sourced from Deribit.
Position Monitor provides 2D/3D risk graphs, PnL, and Greeks, with trace collection intervals (Off/Daily/Hourly).

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Where they differ

GuruFocus

Distinct strengths include:

Screeners Stock Ideas Stock Comparison Portfolio Investor Holdings US Government Trades News Alerts

Global value-investing research platform covering ~100,000 stocks in ~100 markets plus 8,000+ institutional investors and 15,000+ mutual funds holdings, designed to provide historical financial and valuation data for long-term investors.
All-in-One Screener offers 500+ fundamental, valuation, profitability, growth, dividend, guru and insider filters, supports custom filters/formulas and screening by regions, countries, exchanges and user portfolios.
Stock pages combine up to 30-year financial statements, valuation ratios, proprietary GF Score (quality, value, growth, momentum and GF value), dividend data, ownership, operating/segment metrics, filings, transcripts, PDF reports and downloadable charts/tables.
Guru and institutional tools track portfolios and trades of thousands of investors, including real-time guru picks, 13F and 13D/13G data for all institutional investors (PremiumPlus+), mutual fund holdings, sector/geographic trends, ETF and options holdings.

MesoSim

Distinct strengths include:

Options & Derivatives Paper Trading APIs & SDKs

Advanced options strategy backtesting service built around a low-code workflow.
Strategy Definition schema supports multi-leg structures plus entry/exit/adjustments and simulator controls (fill model, commissions/slippage, margin, position monitoring).
TradFi instruments documented for simulation: SPX (data from 2010), RUT/VIX (data from 2012), and GLD (data from 2012), with index vs equity option modeling notes.
Published data availability + vendors and resolution (5-minute): SPX/RUT/VIX/GLD sourced from Cboe Global Markets; BTCUSD/ETHUSD (and historical SOLUSD) sourced from Deribit.

Feature-by-feature breakdown

Attribute	GuruFocus	MesoSim
Categories Which research workflows each platform targets	Shared: Data Visualizations, Backtesting, AI, AI Chat Unique: Screeners, Stock Ideas, Stock Comparison, Portfolio, Investor Holdings, US Government Trades, News, Alerts, Calendar, Data APIs, IPO, Spin-offs, Acquisitions, Delisted, Dividends, GDP, Interest Rates, Inflation Rates, Unemployment Rates, Commitment of Traders (COT), Yield Curves, Financials, Scores, Valuation Models, Insider Data, Institutional Data, Short Interest, 13F, 13D/13G, ETF Overview, ETF Holdings, Analyst Forecasts, Analyst Price Targets, Analyst Recommendations, Transcripts, Education, Videos, Blogs, Forums, Newsletters, Stock Handbook	Shared: Data Visualizations, Backtesting, AI, AI Chat Unique: Options & Derivatives, Paper Trading, APIs & SDKs
Asset types Supported asset classes and universes	Stocks, ETFs, Mutual Funds, Options, Funds	Options, Cryptos
Experience levels Who each product is built for	Beginner, Intermediate, Advanced	Intermediate, Advanced
Platforms Where you can access the product	Web, Mobile, Desktop, API	Web, API
Pricing High-level pricing models	Free, Subscription	Free, Subscription
Key features Core capabilities called out by each vendor	Unique Global value-investing research platform covering ~100,000 stocks in ~100 markets plus 8,000+ institutional investors and 15,000+ mutual funds holdings, designed to provide historical financial and valuation data for long-term investors. All-in-One Screener offers 500+ fundamental, valuation, profitability, growth, dividend, guru and insider filters, supports custom filters/formulas and screening by regions, countries, exchanges and user portfolios. Stock pages combine up to 30-year financial statements, valuation ratios, proprietary GF Score (quality, value, growth, momentum and GF value), dividend data, ownership, operating/segment metrics, filings, transcripts, PDF reports and downloadable charts/tables. Guru and institutional tools track portfolios and trades of thousands of investors, including real-time guru picks, 13F and 13D/13G data for all institutional investors (PremiumPlus+), mutual fund holdings, sector/geographic trends, ETF and options holdings. Insider and politician trading trackers provide real-time insider buys/sells, clusters and combined guru+insider signals, plus a dedicated U.S. politician trading tracker with real-time picks and full politician lists. Market & macro dashboards cover U.S. and global valuation (Buffett Indicator, Shiller P/E, GF Value for major indices), Treasury yield curve, inflation, debt-to-GDP, GDP, unemployment, VIX and broader economic indicators across multiple regions.	Unique Advanced options strategy backtesting service built around a low-code workflow. Strategy Definition schema supports multi-leg structures plus entry/exit/adjustments and simulator controls (fill model, commissions/slippage, margin, position monitoring). TradFi instruments documented for simulation: SPX (data from 2010), RUT/VIX (data from 2012), and GLD (data from 2012), with index vs equity option modeling notes. Published data availability + vendors and resolution (5-minute): SPX/RUT/VIX/GLD sourced from Cboe Global Markets; BTCUSD/ETHUSD (and historical SOLUSD) sourced from Deribit. Position Monitor provides 2D/3D risk graphs, PnL, and Greeks, with trace collection intervals (Off/Daily/Hourly). Volatility Surface viewer to explore implied-vol surfaces with overlays (e.g., open interest, volume, bid-ask spread, Greeks) and playback at 5-minute resolution (non-crypto in current version).
Tested Verified by hands-on testing inside Find My Moat	Yes	Not yet
Editor pick Featured inside curated shortlists	Highlighted	Standard listing

Frequently Asked Questions

Which workflows do GuruFocus and MesoSim both support?

Both platforms cover Data Visualizations, Backtesting, AI, and AI Chat workflows, so you can research those use cases in either tool before digging into the feature differences below.

Do GuruFocus and MesoSim require subscriptions?

Both GuruFocus and MesoSim keep freemium access with optional paid upgrades, so you can trial each platform before committing.

Which tool has mobile access?

GuruFocus ships a dedicated mobile experience, while MesoSim focuses on web or desktop access.

What unique strengths set the two platforms apart?

GuruFocus differentiates itself with Global value-investing research platform covering ~100,000 stocks in ~100 markets plus 8,000+ institutional investors and 15,000+ mutual funds holdings, designed to provide historical financial and valuation data for long-term investors., All-in-One Screener offers 500+ fundamental, valuation, profitability, growth, dividend, guru and insider filters, supports custom filters/formulas and screening by regions, countries, exchanges and user portfolios., and Stock pages combine up to 30-year financial statements, valuation ratios, proprietary GF Score (quality, value, growth, momentum and GF value), dividend data, ownership, operating/segment metrics, filings, transcripts, PDF reports and downloadable charts/tables., whereas MesoSim stands out for Advanced options strategy backtesting service built around a low-code workflow., Strategy Definition schema supports multi-leg structures plus entry/exit/adjustments and simulator controls (fill model, commissions/slippage, margin, position monitoring)., and TradFi instruments documented for simulation: SPX (data from 2010), RUT/VIX (data from 2012), and GLD (data from 2012), with index vs equity option modeling notes..

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