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SAFE (Simple Agreement for Future Equity) was created by Y Combinator to simplify early-stage fundraising. A Convertible Note is an older instrument, structured as debt with an interest rate. Both allow raising money quickly without immediate valuation — but the mechanisms and risk profiles differ significantly.
Key Comparison
SAFE (advantages): Simpler (5 pages), no maturity date, no interest, not debt so creates no repayment obligation if the company doesn't raise again. SAFE (disadvantages): No maturity date can be a disadvantage if you don't raise a priced round — investors have no leverage to require conversion. Convertible Note (advantages): More familiar to many non-US investors; maturity date creates a clear deadline; some corporate/family office investors prefer debt instruments. Recommendation: Raising from US angels/VCs → SAFE. Raising from corporate/strategic investors or non-US markets → Convertible Note may be more appropriate.
“Many founders sign SAFEs without carefully reading the valuation cap and discount clauses. Those significantly affect founder dilution upon conversion — don't let lawyers understand it for you.”