The best replacement for lightroom 4 is aperture 3.

The best alternatives to lightroom 4 are rated as following:
★★★★★  aperture 3
★★★★  aperture
★★★  elements 11
★★★  elements 10
★★★  photoshop cs6
★★  iphoto
★★  photoshop elements
★★  lightroom 5
★★  elements
★★  aperture 3.3
★  photoshop cs5
★  aftershot pro
★  capture nx2
★  cs6
★  photoshop elements 11
★  capture one
  camera raw
  lightroom 3
  capture one 6
  dpp
  cs6 photoshop
  pse11

Your alternative for lightroom 4 is not listed? Suggest!
Speaking about lightroom 4, one probably shouldn't forget about silver 2.

Other search terms related to lightroom 4 and their ratings are:
★★★★★ silver 2
You have in mind a companion for lightroom 4 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of lightroom 4 in all years. Click on graph for more.
lightroom 4
aperture 3
aperture