Free IV Rank Scanner for Options Sellers

IV Rank is the single most important metric for selling options. It tells you whether implied volatility is high or low relative to where it's been over the past year. A stock with 80% IV doesn't mean much on its own. But if that stock normally trades at 90% IV, it's actually cheap. If it normally trades at 40% IV, it's extremely elevated and the premiums are rich.

Most scanners either don't show IV Rank at all, or lock it behind a paywall (Barchart Premier charges $29.95/month just to see it). Flow Proof calculates IV Rank daily for 25 stocks and shows it for free alongside the IV/HV ratio, setup grade, and AI analysis.

How IV Rank Works in the Scanner

The scanner stores daily ATM implied volatility for every stock it tracks. After 10+ days of data, it calculates where today's IV sits relative to the range over that history. An IV Rank of 80 means current IV is higher than 80% of the observed values. An IV Rank of 20 means volatility is near its lows.

For selling puts, you want high IV Rank. Options are expensive relative to normal, which means you collect more premium. When IV eventually contracts back toward its average (which it usually does), the option loses value faster than theta alone would predict. You're harvesting the volatility risk premium, which is the statistical edge behind all premium selling strategies.

IV Rank vs. IV/HV Ratio

The scanner shows both. IV Rank tells you if implied volatility is high relative to the stock's own history. The IV/HV ratio tells you if implied volatility is high relative to what the stock has actually been doing recently. Both matter.

A stock with high IV Rank AND an IV/HV ratio above 1.0 is the sweet spot. Options are expensive both historically and relative to actual movement. That's where the edge is fattest.

If IV/HV is below 1.0, the market is pricing in less volatility than what's actually happening. Selling options there means you're getting paid less than the actual risk. The scanner flags this automatically.

What IV Rank Means for Your Delta Target

Flow Proof adjusts the recommended delta based on market regime (VIX level). In low-VIX environments, you can sell closer to the money (30-35 delta) because premiums are thinner. In high-VIX environments, sell further out (20 delta) because premiums are rich even at lower deltas and the extra distance protects you from outsized moves.

The AI Analyze button factors all of this in. It looks at IV Rank, current VIX regime, the option chain from Tradier, and finds the best put at your target delta. You get a specific recommendation, not a generic suggestion.