Forget RAND() hacks and waiting for "Average, Best, and Worst" case scenarios to run. MonteSheet is a scorchingly-fast Monte Carlo simulation engine built directly into Google Sheets™.

Perfect for FP&A, Fractional CFOs, Startup Founders, and Project Managers who need to quantify risk, forecast revenue, and run complex probabilistic models without paying $3,000+ for legacy desktop software.

Access high-performance Monte Carlo simulation, financial modeling, risk analysis, scenario analysis, and sensitivity analysis in a single add-on for Google Sheets™. Forecast revenue, cash flow, project costs, NPV, ROI, startup valuation, and business risk in seconds.

Powered by the open-source statistics engine @veenie/risk, live (and auditable) on npm: npmjs.com/package/@veenie/risk

Built by Veenie Aerospace (veenie.space), the space-simulation-in-the-browser company.

**** FINALLY, ACTUALLY FAST RISK ANALYSIS IN GOOGLE SHEETS™ ****

No context switching. No writing Python scripts. No exporting to Excel. MonteSheet reads your existing spreadsheet formulas, assigns probability distributions to your inputs, and recalculates your model thousands of times to find the actual mathematical probability of hitting your targets.

Works seamlessly on Mac - unlike @RISK, Crystal Ball, or Risk Solver, which require Windows and Excel. MonteSheet brings professional-grade risk analysis, scenario analysis, sensitivity analysis, and what-if analysis to Google Sheets™ on any platform, Mac included.

**** HOW MONTESHEET WORKS ****

🔧 THE SIMULATION ENGINE
➤ Point-and-click interface to assign probability distributions
➤ Select any formula cell as your Target Output (NPV, Year-End ARR, Total Project Cost).
➤ Instantly generate Histograms, Scatter Plots, and P10 / P50 / P90 percentiles.
➤ Export native Google Sheets™ charts and summary reports with one click.

Access 17 Monte Carlo distributions, available directly in Google Sheets™:
➤ Normal, Log-Normal, Triangular, PERT, Uniform, Discrete Uniform, Beta, Gamma, Exponential, Weibull, Pareto, Student's t, Poisson, Binomial, Negative Binomial, Bernoulli, Geometric

Explore every probability distribution with the live statistics simulator at montesheet.com/distributions

🔐 100% PRIVATE & SECURE

Legacy simulation add-ons send your proprietary data to third-party cloud servers, resulting in slow queues and massive security risks.

Not us! 

MonteSheet uses a headless calculation engine running entirely in your local browser memory. 100,000 iterations take less than 4 seconds. No API calls are made. Your financial data never leaves your computer — not even on Mac, where legacy Windows-only risk analysis tools simply don't run at all.

📊 SENSITIVITY ANALYSIS (TORNADO CHARTS)

Stop guessing which variable matters. MonteSheet automatically calculates Spearman Rank Correlations across your thousands of simulations to generate Tornado Charts. Instantly see exactly which input is driving the most uncertainty in your model — the same technique used in professional sensitivity analysis and risk modeling software costing thousands per year.

🎲 AUDIT-READY RANDOM NUMBER GENERATION

No more "the numbers changed since last time" conversations with auditors. Repeat the runs and get the same results.

MonteSheet Pro uses Mulberry32, a fast-seeded pseudorandom number generator (PRNG), so your Monte Carlo simulation results are fully reproducible. Run the model today, your boss runs it tomorrow — same P50, every time.

This is the same class of deterministic RNG used in scientific computing and game development, applied here to financial modeling and statistical simulation.

🧮 READY-MADE FINANCIAL ANALYSIS TEMPLATES

Don't start from a blank sheet. Load a working example with one click and see a real Monte Carlo simulation running in seconds:
➤ SaaS LTV & Revenue Forecast — model customer lifetime value and MRR growth under uncertainty
➤ Investment & Portfolio Returns — simulate expected return distributions for portfolio risk analysis
➤ Real Estate Cash Flow — Monte Carlo simulation for real estate risk analysis and deal underwriting
➤ Retirement & Withdrawal Planning — probability of running out of money, P10/P50/P90 scenarios
➤ Project Cost Estimation — PERT-based cost simulation for construction and software budgets
➤ E-commerce Unit Economics — margin and CAC sensitivity analysis under demand uncertainty

Each template is a real, editable Google Sheets™ model, not a screenshot. Open it, swap in your own numbers, and run your first simulation in under 1 minute.

**** WHAT'S INCLUDED ****

⭐️ FREE TIER
Up to 1,000 iterations, basic distributions (Normal, Triangular, Uniform), and summary statistics. Perfect for testing your models and running basic risk analysis.

⭐️⭐️⭐️ PRO ACCESS
Everything unlocked.
➤ Up to 100,000 iterations, advanced distributions (Log-Normal, PERT, Beta, Gamma, Weibull, and more)
➤ Sensitivity Tornado Charts, Mulberry32 seeded RNG for reproducible audits
➤ Raw data matrix exports: the full simulation matrix, every trial, every input and output value, dumped straight into a new sheet tab for your own pivot tables and statistical analysis.

**** THE GOOGLE SHEETS™ ALTERNATIVE TO @RISK, CRYSTAL BALL, AND RISK SOLVER ****

@RISK costs $2,200–2,900/year. Crystal Ball costs $1,000–2,200/year. Risk Solver costs $2,500–6,000/year. All three are Windows-only Excel add-ins — none of them run on Mac, and none of them run inside Google Sheets™.

MonteSheet Pro is a one-time purchase, runs natively in Google Sheets™, and works on Mac/OSX, Windows, Linux and ChromeOS — anywhere Google Sheets™ runs, especially Mac and OSX machines that @RISK and Crystal Ball have never supported.

PERFECT FOR TEAMS WHO NEED TO:
→ Model SaaS churn and revenue runway probabilities.
→ Estimate complex construction or software project budgets using PERT distributions.
→ Calculate expected returns on real estate and M&A deals.
→ Run scenario analysis and what-if analysis for pitch decks and board meetings.
→ Build audit-ready financial models with reproducible random sampling.
→ Teach or learn Monte Carlo methods with a live, visual statistics simulator.

**** SUPPORT & COMMUNITY ****

Visit: https://montesheet.com
Contact: contact@montesheet.com
Aerospace tools in Google Sheets™: https://veenie.space/tools/aerosheet

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🌎 *** Money Never Sleeps, and MonteSheet is for the whole world ***

MonteSheet runs natively in your spreadsheet, no matter where you're modeling from. Here's what analysts, controllers, and founders around the world are using it for:

🇫🇷 Pour les analystes et directeurs financiers en France: Réalisez vos modélisations financières et analyses de sensibilité directement dans Google Sheets™. MonteSheet est l'outil parfait pour évaluer le risque d'un business plan, projeter des flux de trésorerie, ou estimer les coûts d'un projet via des lois de probabilité (PERT, log-normale). Une véritable alternative à @RISK, enfin compatible avec Mac.

🇪🇸 Para startups y analistas en España y Latinoamérica: Lleva tus modelos financieros al siguiente nivel. Proyecta flujos de caja, calcula el VAN (Valor Actual Neto) bajo incertidumbre, y realiza análisis de escenarios sin depender de software costoso exclusivo para Windows. La mejor herramienta para valoración de empresas y unit economics en Google Sheets™.

🇩🇪 Für Controlling und Projektmanagement in DACH: Führen Sie komplexe Monte-Carlo-Simulationen und Risikoanalysen nahtlos in Google Sheets™ durch. Perfekt für die Umsatzplanung, ROI-Berechnungen, Budgetierung und die Erstellung von Tornado-Diagrammen. Die einzige professionelle Alternative für Mac-Nutzer in Deutschland, Österreich und der Schweiz.

🇮🇹 Per la pianificazione aziendale in Italia: Ottimizza il tuo business plan con la simulazione Monte Carlo nativa. Indispensabile per consulenti e analisti finanziari che vogliono valutare il rischio di portafoglio, l'incertezza dei ricavi SaaS o gestire l'analisi di sensibilità aziendale (what-if analysis) direttamente dal proprio browser.

🇧🇷 Para modelagem financeira no Brasil e Portugal: Construa modelos robustos e faça análise de viabilidade de projetos no Google Sheets™. Essencial para CFOs e analistas projetarem métricas de e-commerce, valuation de startups e risco de fluxo de caixa com distribuições estatísticas avançadas e gráficos tornado.

🇸🇦 للمحللين الماليين والشركات الناشئة في الخليج والعالم العربي: أداة احترافية لمحاكاة مونت كارلو والنمذجة المالية مدمجة مباشرة في Google Sheets™. مثالية لتحليل المخاطر، تحليل الحساسية، تخطيط السيناريوهات، التنبؤ بالإيرادات، التدفقات النقدية، تقييم الشركات الناشئة، إعداد دراسات الجدوى، تقدير تكاليف المشاريع، حساب ROI وNPV، وإعداد خطط الأعمال في ظل عدم اليقين باستخدام التوزيعات الاحتمالية. البديل الاحترافي الوحيد المتوافق بالكامل مع Mac دون الحاجة إلى برامج Windows المكلفة.

🇯🇵 日本の財務・データ分析チームへ: Google スプレッドシート™ 向けのプロフェッショナルなモンテカルロ・シミュレーターです。事業計画の不確実性、収益予測、SaaSのLTVモデリング、またはプロジェクトコストの見積もりをMac環境でシームレスに実行できます。FP&A（経営企画）に最適なリスク分析ツールです。

🇨🇳 专为财务建模和初创团队打造: 原生集成于 Google 表格™ 的专业蒙特卡洛模拟插件。无需离开浏览器即可进行 SaaS 收入预测、项目成本估算、投资回报率 (ROI) 建模和复杂的敏感性分析。完美替代不支持 Mac 系统的传统 Windows 风险评估软件。

🇰🇷 한국의 재무 분석가와 스타트업을 위한 도구: Google 시트™에서 바로 실행되는 재무 모델링 및 몬테카를로 시뮬레이터입니다. 스타트업의 런웨이 예측, 투자 리스크 평가, 프로젝트 예산 산정 등 불확실성을 수치화해야 하는 데이터 팀에게 필수적인 시나리오 분석 솔루션입니다.

🇷🇺 Для финансового моделирования и оценки рисков: Профессиональный симулятор Монте-Карло в Google Таблицах™. Используйте вероятностные распределения для прогнозирования выручки, оценки инвестиционных проектов и расчета юнит-экономики. Идеальное решение для аналитиков и фаундеров, работающих на macOS.