About boloneko

What it is, and what it isn’t

boloneko’s Options Time Lab takes a position you describe (up to 8 legs of calls, puts, and stock) and estimates its P&L on every day from day 0 to expiration, at every price in a range. Broker charts usually show two lines, today and expiration. The Lab fills in the days between, in four views: the time-slice chart, the price-slice chart, the P&L heatmap, and the time-effect map.

It isn’t a broker, a trading platform, or an advice service. It doesn’t connect to any account, doesn’t fetch market data, and doesn’t tell you what to trade. Every number on the site comes from the model described below.

Model and methods

The Lab prices every option leg with the Black-Scholes model:

• European exercise. In the model, each option can be exercised only at expiration.
• Continuous dividend yield. Dividends enter as a yearly yield q, not as payments on specific dates.
• ACT/365. Time is counted in calendar days, and a year has 365 days. Same-day expiration is modeled as a quarter of a day.
• Theta per calendar day. Theta and the time-effect map measure one calendar day, weekends included.
• Day 0 is the entry. Every leg is opened on day 0. With entry prices calculated from IV, P&L at the current price on day 0 is zero; with prices you enter, it shows the gap between your price and the model price.
• No costs. Commissions, fees, interest, and taxes are not included.
• One IV per leg. Each leg keeps its implied volatility at every price and date. The IV shift moves all legs by the same number of percentage points.

All figures are Black-Scholes model estimates, not market quotes or guarantees. US stock and ETF options are American-style and can be exercised at any time. This model treats every option as European and does not model early exercise or assignment. Your broker’s prices and Greeks will differ: brokers use live quotes, volatility skew and their own models.

Limits

• No live quotes or option chains: you enter the current price, the IV, or the entry prices yourself.
• No volatility skew: each leg has the one IV you give it.
• Early exercise and assignment are not modeled (see above). The time-effect map hatches the areas where early exercise is likely.
• Far from the current price or close to expiration, model numbers can differ a lot from real quotes.
• One underlying per position, up to 8 legs; each leg is a call, a put, or stock.

Contact

Questions, corrections, and bug reports: scyancat.dev@gmail.com. Nothing you enter in the Lab reaches us, so if you want us to see a setup, include its share link.

Credits and licenses

• IBM Plex Sans and Fraunces fonts, under the SIL Open Font License 1.1 (full text at /fonts/OFL.txt).
• Lucide icons, under the ISC License.
• Apache ECharts, under the Apache License 2.0.
• React, under the MIT License.
• three.js, under the MIT License.