The best replacement for omnigraffle is conceptdraw.

The best alternatives to omnigraffle are rated as following:
★★★★★  conceptdraw
★★★★★  visio
★★★  omnigraffle pro
★★  illustrator
★★  mindmanager
★★  sketch
★★  axure
★★  lucidchart
★★  balsamiq
★  fireworks
★  creately
★  smartdraw
★  scapple
★  curio
  grafio

Your alternative for omnigraffle is not listed? Suggest!
Speaking about omnigraffle, one probably shouldn't forget about sitemap.

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



Google Trends

Scale is based on the average worldwide traffic of omnigraffle in all years. Click on graph for more.
omnigraffle
conceptdraw
visio