Stock screeners are essential tools for finding trading opportunities. Instead of manually reviewing thousands of stocks, a screener filters the market down to candidates matching your specific criteria in seconds.
Why Traders Need Stock Screeners
Without a screener, you’re limited to trading stocks you already know or stumble upon. A screener systematically identifies opportunities across the entire market based on your criteria:
- Volume surges - Find stocks with unusual activity
- Technical patterns - Filter by chart setups, moving average crossovers, RSI levels
- Fundamental criteria - Screen by earnings growth, P/E ratios, market cap
- Gap scanners - Identify pre-market gaps for day trading
How to Build Effective Scans
The best scans are simple and focused. Common mistakes include adding too many filters (which eliminates good candidates) or too few (which produces noise).
Starter Day Trading Scan
- Average volume > 1 million shares
- Price between $5 and $100
- Today’s volume > 2x average
- Gap up > 3% or relative volume > 3x
Starter Swing Trading Scan
- Average volume > 500,000
- Price above 50-day moving average
- RSI between 30 and 50 (pullback in uptrend)
- Positive earnings growth
Closing the Loop: Screener to Journal
Finding stocks is only half the equation. The other half is tracking which scan criteria lead to profitable trades over time.
When you find a trade through a screener, document the scan criteria in your trading journal. Over time, you’ll discover which scans produce your best setups. JournalPlus lets you tag trades with your scan source, so after 100+ trades you can see data like “Gap-up scans produce 62% win rate vs. 45% for squeeze scans” and adjust your focus accordingly.
Our Recommendation
Best for most traders: Finviz - powerful free screener that handles 90% of what most traders need.
Best for TradingView users: TradingView Screener - seamless integration with charting eliminates context switching.
Best for professional day traders: Trade Ideas - AI-powered scanning is unmatched but comes at a premium price.
Start with free options, learn what criteria matter for your strategy, and only upgrade when free tools genuinely limit your edge.