| What it does | Free attendance calculator for students to track how many classes they can safely miss
| Free options calculators and trade analyzer that shows its assumptions
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Calculate how many remaining classes can be missed while staying at target
- Determine how many consecutive sessions must be attended to recover if below threshold
- Track attendance for multiple subjects separately
- Browser-based with no sign-up or account required
- All calculations performed locally without sending data to servers
| - Trade analyzer for single and multi-leg positions
- 58 strategy templates
- Black-Scholes-Merton Greeks calculator
- Scenario matrix across price and time
- Volatility labeled by source
- MarketData.app integration for option chains
- Browser-based position storage
- Shareable position links
- 20+ focused calculators
- Plain-English learning library
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| What makes it different | - No account or sign-up needed – instant access with no data collection
- All calculations happen in your browser – attendance data never leaves your device
- Supports multiple institutional requirements with 75%, 80%, 85%, and 90% target options
- Tracks multiple subjects simultaneously to prevent any single module from sliding below threshold
- Built and maintained by a single developer focused on honest, accurate answers
| - Shows which numbers are exact arithmetic, which are estimates, and which come from user input
- No account required and positions stay in browser
- Never hides assumptions or pricing
- Server never sees user data or tokens
- Exact expiration payoff calculations
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 7 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 4 |
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| Citation Flow (Majestic) | 19 | 20 |
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| Referring domains (Majestic) | 3 | 9 |
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CalcAttendance
CallPutHub