When we launched the stock screener, we thought the hard part was the engineering — filtering 8,000+ US stocks in real-time against user-defined criteria. That was hard, but it wasn't the real problem.
The real problem was that most users opened the screener, added a bunch of random filters, got 300 results, and had no idea what to do next. Usage dropped off after the first week.
We've since redesigned the UX, added preset scans, and watched how the traders who do find value in screeners actually use them. Here's what we learned.
The Mistake Everyone Makes First
Opening a screener without knowing what you're looking for is like opening Google without a question. You'll browse, click around, and leave without finding anything useful.
The users who get results from screeners answer one question before they touch a single filter: what kind of trade am I looking for today?
- Momentum plays? Scan for strong relative volume and price near 52-week highs.
- Mean reversion? Oversold RSI + price near support.
- Breakout setups? Price consolidating near resistance with volume building.
One focus, one scan, a handful of results. That's how it works.
What We Built After Watching Users Struggle
Preset scans. We added templates for common setups — gap up on high volume, oversold bounce candidates, earnings movers, relative strength leaders. Users who start with a preset and customise from there retain 4x better than users who start from scratch.
Fewer default filters. Our first version showed 20+ filter options on screen. Overwhelming. We reorganised into categories and show the five most-used filters first. Power users can expand to the full set. This one UX change cut the "opened screener but ran zero scans" rate in half.
Context alongside results. A ticker symbol alone means nothing. Results now show mini-charts, key stats, and the reason each stock matched your scan. You can evaluate at a glance instead of clicking through 30 individual charts.
Scans That Actually Surface Trades
After months of watching what power users build, these three patterns produce the most consistent results:
The pre-market gap scan. Stocks gapping up 3%+ on above-average pre-market volume. This catches earnings movers, news catalysts, and sympathy plays. Run it 15 minutes before open, pick the top 3–5 candidates, and prepare levels on each. Our pre-market routine post covers this workflow.
The oversold bounce. RSI below 30 on the daily chart, price within 5% of a 52-week low, but with volume starting to pick up. This is a contrarian scan — you're looking for stocks that have been beaten down but show early signs of buyers stepping in. Higher risk, but the risk/reward can be excellent.
The relative strength scan. Stocks outperforming their sector and the broader market over the past month. If the S&P is flat and a stock is up 15%, it has relative strength. These tend to lead on the next market push higher. Combine with volume analysis for confirmation.
The Screener Isn't the Strategy
This is worth emphasising because we see the confusion regularly. A screener narrows the universe. It doesn't tell you to buy.
Finding a stock that matches "oversold + high volume + near support" means it passed a filter. You still need to pull up the chart, check the context, define your entry and exit, and size the position. The screener saved you from scrolling through 8,000 charts. The analysis is still yours.
The best workflow we've seen: run your scan, pick the top 3–5 results, pull them into your watchlist, and do your actual analysis there. The screener is step one, not the whole process.
Building Custom Scans
The preset scans are starting points. The real power comes when you build scans tailored to your specific strategy.
The process we recommend: start with one condition that defines the core setup. For a momentum strategy, that might be "price above 20-day moving average." Run it. You'll get hundreds of results. Now add a second filter — "relative volume above 2x." The list shrinks to maybe 30. Add a third — "RSI between 50 and 70." Now you're looking at 5–10 names in a momentum sweet spot: trending up, attracting attention, not yet overextended.
Three filters is usually the right number. Each one should have a clear reason:
- Direction/trend filter — "Is this moving the way I want?"
- Momentum/volume filter — "Is there real participation behind this move?"
- Timing filter — "Is now a good time to enter, or is it overextended?"
More than four filters and you're over-optimising for today's market. The scan becomes so narrow it won't work next week.
Common Traps
Too many filters. If your scan returns zero results, you've over-filtered. Start broad (2–3 conditions) and add criteria only if you're getting too many matches. We see users add six or seven conditions trying to find "the perfect setup." There is no perfect setup — there's good enough with proper risk management.
Only scanning once. Markets change daily. A scan that returned nothing yesterday might surface five candidates today. The users who get the most from screeners run the same 2–3 scans every session as part of their pre-market routine. Consistency is the difference between getting lucky once and systematically finding opportunities.
Ignoring what the market is doing. Running a bullish breakout scan in a confirmed downtrend will produce garbage. Match your scan type to the current environment. Our market analysis widget gives you the big-picture context at a glance. In a downtrend, switch to oversold bounce scans or short setups. In a range, look for mean-reversion candidates. The scan should fit the regime.
Chasing yesterday's movers. A stock that gapped 15% yesterday will show up in "biggest movers" scans today, but the move already happened. The traders who consistently profit from screeners focus on developing setups, not completed ones. A stock that just broke out of a two-week range on volume is more interesting than one that spiked and is now extended.
Try It
The screener widget is available on any Nydar dashboard, with preset scans and full customisation. Start with a preset, modify one or two filters, and see what comes back.
Screen 8,000+ stocks and find setups that match your criteria on Nydar. See pricing for details.
Originally published at Nydar. Nydar is a free trading platform with AI-powered signals and analysis.
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