Workplace surveillance has become a particularly dystopian trend in the era of big data, allowing employers to micro-manage workers by tracking everything from their snack consumption to fine-grained details about their movements and productivity throughout the day.

Now, a new artificial intelligence tool is letting companies monitor their employees’ moods and emotions by analyzing their conversations on Slack.

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A Japan-based company called AIR has been pitching the technology, Vibe, as a way to measure company morale in real-time using a process called sentiment analysis. The software monitors Slack conversations and automatically track their overall mood based on five emotions: happiness, stress, disappointment, irritation, and disapproval. It then plots these feelings on a graph, allowing managers to track down the cause of mood swings throughout the work day.