A powerful, visual tool for simulating startup equity dilution with support for modern financing instruments.
- SAFE Support: Full modeling of both pre-money and post-money SAFEs with caps, discounts
- Visual Dilution Tracking: Generate beautiful visualizations of equity dilution over time
- High-Resolution Output: Create presentation-ready cap table visuals
- Typed API: Fully TypeScript implementation with strong typing
- Founder-Friendly: Easy to understand how different financing scenarios impact founder equity
This example shows how equity changes through different fundraising events:
// Create a new company with founders and an option pool
const company = new Company({
founders: [
{ name: 'Founder1', ownership: 45 },
{ name: 'Founder2', ownership: 45 }
],
pools: [
{ note: 'Employee Equity Pool', ownership: 10 }
]
});
// Simulate equity events
company
.giveEquity(5, 'Techstars') // Give 5% to accelerator
.signSafe('uncapped', 100_000, 'Techstars', 20) // Uncapped SAFE with 20% discount
.signSafe(5_000_000, 150_000, 'Investor 1', undefined, 'pre-money') // Pre-money SAFE with $5M cap
.signSafe(4_500_000, 200_000, 'Investor 2', 10, 'post-money') // Post-money SAFE with $4.5M cap and 10% discount
.pricedRound(5_000_000, 1_000_000, 'Seed Round') // Seed round at $5M pre-money valuation
.logEquity() // Print cap table to console
.plot('equity-dilution.png'); // Generate visualizationThis simulator supports modern SAFE (Simple Agreement for Future Equity) agreements:
- Pre-money SAFEs: The older style where conversion happens based on pre-money valuation
- Post-money SAFEs: The newer YC-style where conversion happens based on post-money valuation
- Uncapped SAFEs: Converts based on the round price (with optional discount)
- Capped SAFEs: Converts based on the lower of cap price or round price (with optional discount)
The simulator handles all SAFE conversion calculations automatically when a priced round occurs.
const company = new Company({
founders: [
{ name: 'Founder1', ownership: 50 },
{ name: 'Founder2', ownership: 40 }
],
pools: [
{ note: 'Option Pool', ownership: 10 }
]
}, 1_000_000); // Optional: initial share count| Method | Description |
|---|---|
giveEquity(percent, name, type?) |
Issue equity equal to specified percent (post-issuance) |
signSafe(cap, amount, name, discount?, type?) |
Sign a SAFE with investor |
pricedRound(preMoneyValuation, amount, name?) |
Execute a priced financing round |
logEquity() |
Log current cap table to console |
plot(outputPath?, width?) |
Generate visual equity dilution diagram |
Pull requests are welcome! This is an open-source tool to help founders better understand dilution.
Apache License 2.0 - see the LICENSE file for details.