Investment and Property Analysis Tools
These tools help you look closely at one investment or housing decision before committing money. Individual investors use them to check a stock or ETF, landlords and buyers use them to test a property deal, and renters use the rent vs buy model to see which assumptions would make buying worthwhile.
5 free tools · no sign-up · no ads
All Analysis Tools (5)
Investment Thesis Analyzer
Analyze and score investment opportunitiesStock Analysis Calculator
Analyze stock metrics and valuationETF Investment Simulator
Simulate ETF investment scenarios and returnsReal Estate Investment Analyzer
Analyze real estate investment opportunitiesRent vs Buy Calculator
Compare renting vs buying a home financially
Which tool do I need?
Decide whether I understand a stock well enough to buy it
Tick the checklist statements that are true, write notes for each, and see which categories you cannot yet answer.
Check whether a stock looks cheap on P/E and P/B
Look up a ticker with your API key to see valuation ratios, ROE, debt and three formula-based fair value estimates.
See what fees do to an ETF over 20 years
Project monthly contributions with and without an expense ratio and compare the final values at today's prices.
Check whether a rental property covers its mortgage
Enter price, rent, financing and costs to get cap rate, cash-on-cash return, DSCR and yearly cash flow.
Find how long I need to stay for buying to win
Compare buying and renting year by year with selling costs included and read off the break-even year.
About Analysis Tools
For markets, start with the Investment Thesis Analyzer, a weighted checklist (15 questions for a stock, 7 for an ETF) built around ideas from Buffett, Munger, Lynch and Pabrai; its score measures your own yes answers. Then check the numbers in the Stock Analysis Calculator, which pulls price, ratios and fundamentals from Alpha Vantage and adds three rough fair-value estimates. The ETF Investment Simulator projects regular contributions into a fund with dividends, an expense ratio and inflation. For property, the Real Estate Investment Analyzer returns cap rate, cash-on-cash return, DSCR and a year-by-year cash flow table, and the Rent vs Buy Calculator compares the net worth of a buyer with a renter who invests the difference.
Two honest limits. The Stock Analysis Calculator is the only tool here that calls an outside service: with a free Alpha Vantage key your browser calls alphavantage.co directly, and without one it fills the page with random demo numbers labelled as such. The rest are models of the assumptions you type, using smooth constant returns, so appreciation and investment return dominate the result. None of the scores or labels is a recommendation to buy or sell.
Guides
- Stock Valuation Basics: P/E, P/B, DCF and a Written ThesisWhat P/E, EPS, P/B and dividend yield really measure, a per-share DCF worked by hand, where each method breaks, and how to turn the numbers into a written thesis.
- ETF Fees, Dividends and Monthly Investing Over 30 YearsHow an expense ratio compounds against you, what reinvesting dividends is worth, why contribution timing matters less than you think, and how inflation shrinks the final number.
- Rental Property Returns: Cap Rate, Cash-on-Cash and DSCRRun a rental deal the way lenders and investors do: NOI, cap rate, cash-on-cash return and DSCR worked through on one house, plus the costs beginners leave out.
- Rent vs Buy: Comparing Net Worth, Not Monthly PaymentsWhy comparing rent with a mortgage payment gives the wrong answer, how opportunity cost and selling costs change it, and how to find your break-even year.
Frequently asked questions
Which investment analysis tools need an API key or internet data?
Only the Stock Analysis Calculator, and only for real data. It uses a free Alpha Vantage key that you paste in and is not stored. The thesis checklist, ETF simulator, rental analyzer and rent vs buy model work entirely from the numbers you enter.
Why do property results change so much when I adjust appreciation?
Because home value growth compounds over the whole period and sits on a leveraged purchase. A one-point change in appreciation can move total return and the rent vs buy break-even year by several years. Run a pessimistic case, such as 1% appreciation and a 5% investment return, next to the default.
Can I compare a stock investment with a rental property here?
Not side by side, but you can compare their returns. The rental analyzer gives a total return on cash invested, and the ETF simulator shows growth on contributions. Remember that property returns here exclude selling costs and income tax, and stock projections exclude volatility.
Are ETF returns and stock fair values in these tools forecasts?
No. The ETF presets are rounded long-run figures for illustration, and the fair values are formula outputs with fixed assumptions. Use them to ask better questions, not as price targets or a promise of future returns.
What do these investment models leave out?
Taxes, volatility and most transaction costs. Rental analysis excludes selling costs, income tax on cash flow and depreciation recapture; the ETF simulator does not tax dividends; and every projection uses a smooth return. Adjust inputs or add a margin of safety for those.