The Universal Stylus Initiative (USI) is a non-profit alliance of companies promoting a technical standard for interoperable active pen styluses on touchscreen devices such as phones, tablets, and computers.[1][2]
It defines a two-way communication protocol between the stylus and the computer and allows the stylus to remember user preferences for ink color and stroke. It support 9-axis inertial measurement.[3]
Products started coming to market in 2019 including one stylus and several Chromebooks from different manufacturers.[1] By 2019, there were over 30 members, including Google and 3M, but some major players like Apple and Microsoft had not joined.[3] As of 2022, the promoters include Google, Intel, Lenovo, Samsung, and Synaptics. Dell, Sharp, and Wacom are contributors.
While USI promotes itself as an open standard,[4] access to detailed specifications is restricted to paying members.[5]
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