This article presents a comparison of five feature flag tools for Kotlin applications - Tggl.io, Unleash, LaunchDarkly, Split, and Flagsmith. The analysis includes features offered by each tool, their ease of use, and pricing plans. Tggl.io is highlighted as the top pick due to its balance of usability and integration capabilities. Other tools like Unleash, LaunchDarkly, Split, and Flagsmith are also evaluated based on these parameters. The conclusion emphasizes that the best tool depends on individual project requirements and budget constraints.