The best replacement for uv filter is polarizer.

The best alternatives to uv filter are rated as following:
★★★★★  polarizer
★★★★  lens hood
★★★★  clear filter
★★  nd filter
★★  skylight filter
★★  circular polarizer
★★  polarizing filter
★★  polarizer filter
★  hood
★  cpl filter
★  lens cap
★  protector
★  clear
★  lens protector
★  protector filter
★  skylight 1a
★  nc filter
★  cpl
  haze filter
  reverse osmosis
  neutral density
  digital uv filter
  skylight
  b w uv filter
  neutral density filter
  polarized
  uv haze filter
  polarising
  sky filter

Your alternative for uv filter is not listed? Suggest!
Speaking about uv filter, one probably shouldn't forget about polarizer.

Other search terms related to uv filter and their ratings are:
★★★★★ polarizer
★★★★ circular polarizer
★★★ lens hood
★★ polarizing filter
★ uv filter
uv
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Google Trends

Scale is based on the average worldwide traffic of uv filter in all years. Click on graph for more.
uv filter
polarizer
lens hood