Inside Day Scanner

What Is an Inside Day Pattern?

An inside day is a specific candlestick pattern where the current session's high is lower than the prior session's high, and the current session's low is higher than the prior session's low. Both conditions must be true simultaneously — the entire day's price range is contained within the prior day's range. This is not simply a narrow range day; it is a strict containment condition.

Why Inside Days Matter

The inside day represents a temporary standoff between buyers and sellers. Neither side managed to push price beyond the boundaries established the day before. In technical analysis terms, this compression of price action often precedes expansion — the pattern is sometimes called a "coiled spring" because the energy built up during indecision tends to release in a directional move once the pattern resolves.

The pattern is most useful when it appears in a specific context: after an established trend, during a brief consolidation, and on declining volume. An inside day that forms with noticeably lower volume than the prior bar suggests that the pause is genuine consolidation, not active two-way selling pressure. When volume picks up and price breaks outside the inside day's range, that breakout tends to carry conviction.

How the Scanner Works

This scanner identifies inside day patterns across a broad universe of liquid stocks and ETFs on a daily basis. For each instrument, it compares today's high and low to the prior session's high and low. Any stock where both the inside day conditions are met — current high below prior high, current low above prior low — appears in the results.

The scanner runs after market close each day and presents results sorted by various criteria including relative strength, average daily volume, and sector. This allows traders to focus on inside days that appear in strong stocks with institutional-level liquidity, rather than scanning through low-volume names where pattern reliability decreases.

Trading the Pattern

The standard inside day trade uses the pattern's boundaries as both the entry trigger and the risk reference. For a bullish breakout: if price exceeds the inside day's high on the following session, that is the entry trigger. The stop loss is placed below the inside day's low — the logic being that if price returns to and breaks below the low of the consolidation day, the thesis for an upside breakout is invalidated.

This structure creates a naturally defined risk/reward setup. The inside day's range (from low to high) is the risk being accepted. Because inside days by definition have smaller ranges than the prior session, the stop is often tighter than it would be if placed at a more distant technical level.

Limitations and Context

Inside day patterns do not predict direction on their own. In trending markets, inside days that form in the direction of the prior trend tend to resolve with trend continuation more reliably than those forming against the trend. In choppy, range-bound markets, inside day breakouts fail more frequently because there is no directional current to sustain a move after the initial burst.

For this reason, experienced traders typically combine inside day scanning with a broader market regime filter — checking whether market breadth is positive, whether the relevant index is above key moving averages, and whether sector rotation supports the direction they're trading.

Pattern data sourced from yfinance. This page is for educational purposes only and does not constitute investment advice.