Zepp Health Fires Back: Sues Oura Over Six Patents Covering Sleep, Activity, and Health Scoring

The smart ring patent war has a new front. Zepp Health — parent company of Amazfit — has filed a patent infringement lawsuit against Oura in the US District Court for the Eastern District of Texas. The April 21 filing claims the Oura Ring Gen 3, Gen 4, and the Oura app use technology covered by six Zepp Health patents.

What Patents Are at Stake?

• Sleep monitoring through microactivity states (US 10,624,575)
• Health risk indicators using heart rate and motion data (US 11,806,120)
• Stride length calibration for fitness tracking (US 10,959,649)
• Confidence scoring for wearable sensor measurements (US 9,729,693)
• Motion recognition data acquisition (US 8,989,441)
• Ball game motion recognition (US 8,781,610)

Why This Matters

Oura has been the aggressor in smart ring patent disputes, winning an import ban against Ultrahuman and RingConn in 2025 and filing ITC complaints against Samsung, Reebok, Zepp Health, and Nexxbase. This counter-suit from Zepp Health puts Oura on the defensive for the first time, arguing that Oura's own flagship products rely on Zepp-owned technology.

What This Means for Buyers

For now, Oura Ring Gen 4 at $349 remains fully available and unaffected. But this lawsuit could force Oura into licensing negotiations, potentially raising costs — or lead to software changes. The Galaxy Ring faces its own Oura lawsuit, while RingConn Gen 2 at $299 is the safest patent-free pick. See our full analysis and smart ring comparison.