Redstone Markets

Your brokerage app tells you what a holding is worth today. It's a lot quieter about how bumpy the ride was getting there. Redstone Markets is about that second part. For about 2,900 US stocks and 1,200 ETFs it shows return and risk figures such as the Sharpe ratio, max drawdown, volatility and correlations between assets, and it does the same for portfolios you put together.

You can build a portfolio, copy one that someone else has shared, or compare tickers side by side, and an optimizer proposes weightings. Screeners cover stocks, ETFs and portfolios, and ranking pages list things like the highest Sharpe ETFs and low correlation ETFs. According to the about page, every ticker page, comparison and model portfolio is free to view without an account.

The method is stated plainly, which is a nice touch. Prices, dividends and splits come from Massive, formerly Polygon.io, and are updated every trading day after the US market closes. Returns include reinvested dividends. The Sharpe ratio uses a 3.7% risk-free rate, and beta and alpha are measured against SPY.

One limit follows from that. Risk metrics cover the past year of daily closes. A year is a short window, and a calm year can make a volatile holding look safer than it is. The site covers US-listed securities only.

Starter is free and allows 5 portfolios with 10 assets each, 3 portfolio optimizations a day and 25 watchlist items, with every chart and risk metric included. Plus is $15 a month for 25 portfolios of 25 assets, 50 optimizations a day and private portfolios. Pro is $50 a month and removes the portfolio and asset limits. Yearly billing is advertised as saving 17%.

Private portfolios start at Plus, which means portfolios on the free plan are public. The privacy policy, dated November 2026, confirms it: anyone can see a public portfolio's name, holdings and results along with your display name. The same policy discloses that X Corp. is told when you create an account or buy a subscription, for advertising measurement. Retention is described only as being for as long as necessary.

The about page ends with a clear statement that Redstone is for informational and educational purposes and is not investment advice, and the site's own pages don't appear to name a person or company as the operator. If you're a self-directed investor who likes to look at the risk side of a holding, the free ticker pages are an easy place to start.