How to Validate a SaaS Idea for Free Before Writing a Single Line of Code

A practical zero-budget framework for validating SaaS ideas argues that most founders waste months building products that a week of upfront testing could have ruled out. The approach treats validation as a courage problem rather than a money problem, since every required tool has a free tier. The method follows a hierarchy of signals — from weak indicators like compliments and waitlist sign-ups to stronger ones like booked calls and pre-orders — urging founders to reach at least the third or fourth rung before committing to development. Key tactics include mining Reddit and niche forums for unprompted complaints, and conducting interviews that focus on past behavior rather than hypothetical interest in a product. The core principle is that only strangers voluntarily giving up time, an email, or money constitutes real validation data — not friends, polite acquaintances, or the founder's own judgment.