The best replacement for circular saw is table saw.

The best alternatives to circular saw are rated as following:
★★★★★  table saw
★★★★  miter saw
★★★★  jigsaw
★★  reciprocating saw
★★  worm drive
★  worm saw
★  skill saw
★  track saw
★  hand saw
★  mitre saw
★  band saw
★  plunge saw
★  trim saw
★  jig saw
  angle grinder
  chainsaw
  worm drive saw
  chop saw
  compound miter saw
  milwaukee circular saw
  hypoid
  hypoid saw
  sawzall
  skil saw
  frame saw
  framing saw
  rotary saw

Your alternative for circular saw is not listed? Suggest!
Speaking about circular saw, one probably shouldn't forget about rip fence.

Other search terms related to circular saw and their ratings are:
★★★★★ rip fence
★★★ straight edge
sawhorse
You have in mind a companion for circular saw and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of circular saw in all years. Click on graph for more.
circular saw
table saw
miter saw