Thetify

Learn to sell options with the math, not a hunch.

Thetify is an options-selling course. After every drill it works through the numbers, even when your answer is wrong: Delta, probability of profit, expected value under two models, and the worst-5% tail.

  • No live market data
  • No stock picks
  • No account
  • Works offline

Coming soon to iPhone and Android. The app is in final testing.

Drill feedback screen: every option listed with its Delta, POP, fat-tail expected value and CVaR, the chosen one marked outside the course rules

Practice the decisions sellers actually face

Cash-secured puts, covered calls, the wheel, picking strike and expiration, taking profit, rolling, defending a tested side, assignment, spreads.

22short lessons
95graded drills
216archived daily scenarios
81glossary terms
Wheel simulation on SPY history: assigned at the strike, now holding 100 shares, next step is selling a covered call

Run the whole wheel

Sell a put, get assigned, sell the covered call, on a real dividend-adjusted SPY price path. At the end: every trade in a log, next to simply holding the shares.

Practice calculator: payoff curve, probability readings and expected values for a cash-secured put

Check your own numbers

Type in a put, a covered call or a spread. Drag strike, days and IV and watch probability, expected value and the payoff curve move.

Lesson screen with a Delta slider showing how POP changes across the 16 to 30 delta band

Feel it before you pick

Lessons are interactive: drag Delta and watch POP move, watch time value melt, drag a probability distribution and see expected value change.

What it is, and what it isn't

It is

  • A course with rules, graded drills and worked numbers.
  • Honest about assumptions: every scenario states price, IV, days and rate.
  • Two models side by side: lognormal and a fat-tailed historical one.
  • Private: progress stays on your device. No account, no ads, no tracking.

It isn't

  • A broker. It cannot place trades or connect to one.
  • A data feed. There is no live market data.
  • A stock picker. It never tells you what to buy or sell.
  • A promise. No returns are promised or implied.

Free to start

The first 6 lessons, today's scenario every day, and a daily allowance of drills and calculations are free. Pro unlocks the rest, monthly, yearly or as a one-time purchase. No countdowns, and the price is written on the button.