About Sun Insight Lab
Sun Insight Lab is an independent educational project at suninsightlab.com. It pairs a browser-based historical investment simulator with plain-English writing on risk, valuation, diversification, and time horizon. It's built for everyday investors who want to test ideas against real historical data — and understand the reasoning — before committing capital.
What you'll find here
| Section | What it does |
|---|---|
| Simulator | Three modes — Single, Compare, and Portfolio (weighted, with optional monthly rebalancing) — over historical monthly data. |
| Analysis | Market notes across four tracks: Market Trend, Deep Dives, Breaking, and Basics. |
| Resources | A library of guides organized by level: Beginner, Intermediate, and Advanced (including options strategies). |
| News | Broad market headlines only — for context, not signals. |
| Quant | Rule-based backtesting tools (in progress). |
Our mission
Make investment decision-making more disciplined. We prioritize clarity over hype and encourage readers to weigh downside risk, time horizon, and personal constraints before allocating capital. Every claim on the site is either derived from public price data or from documented assumptions stated in plain text.
How the simulator is built
The simulator is a Web Component written in vanilla JavaScript. It fetches monthly closing-price data (sourced from Yahoo Finance) from our database over a small read-only JSON API, runs a deterministic month-by-month allocation across your selected period, and draws the result with Chart.js. The whole calculation runs in your browser, so you can read the source and reproduce every number.
- Coverage: US-listed stocks, ETFs, the S&P 500, and Bitcoin, from 2010 to the most recent monthly close.
- Update cadence: monthly closes refreshed after each month ends; market news refreshed daily.
- Reproducibility: the price API is public and read-only; script tags use
?v=cache-busters whenever the logic changes.
Editor and author
Sun Insight Lab is an independent, one-person project that founds, edits, and maintains everything on this site. It began with the simulator, built to answer one recurring question from friends and family: "what would have happened if I'd invested X every month into Y for Z years?" That single tool grew into a structured library of explanatory articles meant to help readers interpret the outputs responsibly.
Sun Insight Lab is not a licensed investment adviser, broker, or fund manager, and the site does not offer personalized advice. We also use AI tools to help draft and illustrate content, with human review before publishing (see our editorial policy).
Reach us at [email protected] or via the contact page.
What this site is not
We do not provide personalized financial advice, brokerage services, portfolio management, or guaranteed-return claims. The simulator does not model taxes, dividends, trading fees, slippage, bid/ask spreads, or account-specific rules — real-world results will differ. See our Disclaimer.
How to verify our work
- Reproduce a simulation: open the homepage, pick the same asset and date range used in any article, and confirm the totals match.
- Inspect the data: the price API at
/api/prices?symbols=returns the same monthly closes the simulator uses. - Read the source: the simulator file
stock-calculator.jsis unminified. - Report a discrepancy: use the contact page with the URL, the parameters, and your cross-check source.