40 Years of Price Data.
One Clear Signal:
Buy Now.
Forget gut feelings and market sentiment. Our proprietary algorithm analyzes four decades of price history to identify when stocks experience pullbacks that are historically unusual. Evidence-based investing, automated.
Free for 3 stocks • Full historical analysis included
Trust the Numbers, Not the Noise
Every alert is backed by decades of price data and statistical analysis
Years of History
Per stock analyzed
Data Points
Daily prices tracked
Rarity Threshold
Statistical significance
Objective
No emotions, pure math
Our Proprietary Drawdown Severity Score™
How It Works:
- 1. Historical Analysis: We analyze 40 years of daily prices for each stock
- 2. Pattern Detection: Calculate typical drawdown depth and frequency
- 3. Current Comparison: Compare today's price to historical norms
- 4. Volatility Adjustment: Account for asset-specific volatility
- 5. Severity Score: Generate objective rarity measurement
What This Means:
Normal pullback: Typical market behavior - happens frequently
Moderate pullback: Deeper than usual - worth watching
Large pullback: Historically unusual - happens 1-3x per year
Historic pullback: Extremely rare - once every few years
Want to Understand the Algorithm in Depth?
We've written a complete explainer on how our Drawdown Severity Score™ works, including the mathematical formula and real examples.
Read the Technical Explanation →Frequently Asked Questions
Where does the 40 years of data come from?
We use Yahoo Finance's historical price API, which provides adjusted daily closing prices going back 40+ years for most stocks. This is the same data source used by professional investors and financial analysts worldwide.
How do you calculate what's "rare"?
We analyze all historical pullbacks for each stock to determine what's "normal" for that stock. Then we compare the current pullback to decades of history. When the current decline is significantly deeper than the stock's typical behavior, that's historically unusual.
Why adjust for volatility?
Different stocks have different volatility profiles. A 30% decline might be normal for a volatile tech stock like NVDA, but catastrophic for a stable stock like Johnson & Johnson. Our algorithm compares each stock to its own history, so "historically unusual" means the same thing whether you're tracking TSLA or KO.
Is the data updated in real-time?
We update stock prices daily after market close (4:15 PM ET). This is sufficient because rare discount levels typically last days or weeks, not minutes. Real-time updates aren't necessary for the kind of long-term, value-based investing this tool supports.
Can I see the raw historical data myself?
Yes! Every ticker page shows complete historical charts going back 40 years, all drawdown events, and detailed statistics. Full transparency - you can verify everything we're telling you.
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