ActivityWatch is a free opensource app that automatically tracks how you spend time on your devices such as phones and laptops. Developed by Erik Bjäreholt, Johan Bjäreholt and contributors
License: Open Source
WakaTime is a more polished tool tailored for developers with extensive integrations and a focus on software development, whereas ActivityWatch is an open-source alternative with a broader focus on time tracking across various applications, emphasizing user privacy and customizable self-hosting options.