A/B testing, a fundamental tool for data-driven product development, is typically associated with large tech companies like Facebook and Google, but it holds significant value for smaller companies as well. Smaller companies often dismiss A/B testing due to a misconception about needing a large user base to see meaningful results. However, startups can achieve substantial growth through A/B testing by focusing on significant changes rather than minor optimizations, leveraging the concept of "effect size" over sheer sample size. Startups have a statistical advantage in experimentation because they often aim for larger effect sizes, which can yield more statistical power than larger companies making minimal changes. A/B testing provides reliable insights that dashboards cannot, uncovering unexpected outcomes and ecosystem effects, which can significantly guide product development. It fosters a data-driven culture where decisions are based on evidence rather than assumption, reducing ego-driven decision-making processes. With advancements in technology, A/B testing has become more accessible through modern software development tools and services, allowing even small companies to implement it with ease.