Learn investing, formula by formula

Every number the app shows is a plain formula — no hidden judgment. This library is the human translation: what each term means, the actual calculation, every symbol explained. 29 topics, free.

Valuation — what a company is actually worth

Price is what you pay; value is what you get. These tools estimate the second so you can judge the first.

• DCF — the app’s core valuation model
• Reverse DCF — the DCF run backwards
• ROIC vs WACC — does growth create or destroy value?
• Free cash flow yield — the cash-return “interest rate” of a stock
• P/E and PEG ratios — the quick “how expensive?” checks
• EV/EBITDA — a fairer cross-company price tag
• Analyst price target — useful, but only a supplement

Price trend & timing — reading the chart

A great company can still be a poor entry. These measure the trend and the moment, not the business.

• 200-day moving average — the market’s long-term center of gravity
• 50-day moving average & the golden cross — the faster trend line
• RSI — is the recent move stretched?
• Support — the floor where buyers step in
• 12-1 momentum — the trend that tends to persist

Options & probability — the math of “what are the odds?”

Options put a price on uncertainty. These tools estimate value and probability — estimates, never forecasts.

• Black–Scholes — what an option should be worth, and the odds it pays off
• Implied vs realized volatility — the option-mispricing edge
• Delta — how much an option tracks the stock
• LEAPS — leveraged, time-rich exposure

Risk & quality — durability and the shape of the bet

Upside only matters next to what you’re risking to get it. These measure risk, leverage, and business quality.

• Beta (and why the app adjusts it) — how much a stock moves vs the market
• Volatility (σ) — how much the price bounces around
• Reward : risk — the shape of the bet in one number
• Net debt / EBITDA — how heavy is the debt load?
• Max drawdown — the worst hole a holder had to sit through
• Rule of 40 — is growth paying for itself?

How the app turns all of this into a grade

The letter grade and signal aren’t opinions — they’re these measurements, combined by fixed rules you can inspect.

• The five-component grade — what an “A” is actually made of
• Sector profiles — why a bank isn’t graded like a chipmaker
• Calibration — do 70% odds actually happen 70% of the time?
• Coverage (not confidence) — what the % next to a grade means
• The signal — the one-word verdict
• Sector-relative scoring — grading like against like
• Sizing — how big a position the conviction supports

Open Weekly Monitor →The app computes all of this live on ~1,000 stocks — free, private, every grade shows its work.