The best replacement for passive stylus is active stylus.

The best alternatives to passive stylus are rated as following:
★★★★★  active stylus

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Speaking about passive stylus, one probably shouldn't forget about tether.

Other search terms related to passive stylus and their ratings are:
★★★★★ tether
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Google Trends

Scale is based on the average worldwide traffic of passive stylus in all years. Click on graph for more.
passive stylus
active stylus