The best replacement for impact driver is drill.

The best alternatives to impact driver are rated as following:
★★★★★  drill
★★★★  impact wrench
★★★★  hammer drill
★  drill driver
★  wrench
★  cordless drill
★  screw gun
★  screwdriver
★  combi drill
★  cordless screwdriver
  standard drill
  driver drill
  compact drill
  makita
  impact drill
  milwaukee
  drywall screwdriver
  makita impact driver

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Speaking about impact driver, one probably shouldn't forget about drill.

Other search terms related to impact driver and their ratings are:
★★★★★ drill
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Google Trends

Scale is based on the average worldwide traffic of impact driver in all years. Click on graph for more.
impact driver
drill
impact wrench