Spam & Bot Prevention for SaaS

Expert guidance for preventing spam signups, bot accounts, and abuse of registration and trial flows in SaaS applications.

Core Principles

• Layer defenses — no single technique stops all spam; combine multiple signals
• Minimize friction for real users — invisible protections first, visible challenges only when needed
• Fail closed on high-risk signals — block or queue for review rather than letting spam through
• Monitor and adapt — spammers evolve; your defenses must too

Defense Layers (Priority Order)

Layer 1: Invisible Protections (Zero Friction)

These run silently — real users never notice them.

Honeypot Fields