Explained
The questions we get asked most.
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How do I measure how long my OTPs take to arrive?
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How long should an OTP be valid, and how many digits?
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OTP vs TOTP vs HOTP: what is the difference?
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Two-factor authentication vs. two-step verification: what's the difference?
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What does OTP mean? One-time passwords explained
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What is SIM-swap fraud, and does SMS OTP protect against it?
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What is two-factor authentication (2FA)?
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A test API key is yours immediately. Production unlocks when you add a payment method and verify a sender.