Fitbit has rolled out the dark mode feature in its Android app with version 4.50, allowing users to manually activate the "Dark Theme" or have it automatically adjust based on system settings. This update aims to reduce glare in low-light environments and may extend battery life on OLED devices. However, not all app elements are fully optimized for dark mode at launch, with some inconsistencies expected to be addressed in future updates. The rollout began on August 21. Additionally, Fitbit is exploring AI tools to enhance health tracking, including an AI-driven lab report summary tool and a Symptom Checker that provides personalized health suggestions.