Kinesis Advantage360 Pro

The Kinesis Advantage360 Pro is the most extreme ergonomic keyboard on the list — a curved, split, tented design where keys are arranged in a concave bowl that your fingers naturally cup. At $450, it's also the most expensive recommendation. The ergonomic argument is compelling: the concave key wells eliminate vertical finger movement almost entirely, meaning your fingers travel in small arcs rather than lifting up and over rows. For developers who have been diagnosed with or are at risk for RSI, the Advantage360's documented reduction in finger extension is clinically meaningful. The learning curve is significant — expect 3 weeks of slow, deliberate relearning. After that, many users report it as the most comfortable keyboard they've ever used.