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This $30 iPad stylus senses pressure via headphone jack
Stylus manufacturers have been working hard to replicate the sensation of writing and sketching on tablets over the years, hence the handful of styli that support pressure sensing and palm rejection these days. Unfortunately, these pens don't come cheap, with the Apple Pencil asking for $99 but is still only compatible with the iPad Pro series. Even the other good styli with greater iPad compatibility start at around $50. However, Hong Kong-based GreenBulb has launched a cunning $30 solution dubbed SonarPen on Kickstarter, yet it supports both pressure sensing and palm rejection by making use of the headphone jack. No charging nor wireless connectivity required here, just plug it in and sketch away.
