Health startup Lark has emerged from its temporary stealth mode with the release of an app built into Samsung's Galaxy S5 model. The app works like a virtual health coach that helps users maintain their health and wellness, according to TechCrunch.

Lark chief executive officer (CEO) Julia Hu commented: "We've realized that, in essence, the new smartphone with low power sensors is the ultimate wearable."

Lark uses the Galaxy S5's built-in low-power sensor to monitor the activities of the user. The app gives conversational-style health inquiries, tips, and suggestions. Unlike its previous app-and-wristband product, this new app functions as a standalone app. The monthly use of the app costs $2.99. Galaxy S5 users get a year's free use of Lark. Hu said the company is planning to launch the app on other phones in the future, the report explained.

Based on a regulatory filing last fall, Lark had secured $3.1 million in a funding round, which Hu confirmed this week. The Mountain View-based startup's investors include CrunchFund, TechCrunch reported.