The best replacement for precheck is global entry.

The best alternatives to precheck are rated as following:
★★★★★  global entry
★★★★  clear
★★  nexus

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Speaking about precheck, one probably shouldn't forget about global entry.

Other search terms related to precheck and their ratings are:
★★★★★ global entry
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Google Trends

Scale is based on the average worldwide traffic of precheck in all years. Click on graph for more.
precheck
global entry
clear