The best replacement for intercom is customer.io.

The best alternatives to intercom are rated as following:
★★★★★  customer.io
★★★★  mixpanel
★★  paging
★★  walkie talkie
★★  zendesk
  pabx

Your alternative for intercom is not listed? Suggest!
Speaking about intercom, one probably shouldn't forget about door release.

Other search terms related to intercom and their ratings are:
★★★★★ door release
★★ doorbell
★ keypad
★ door buzzer
★ helmet
pbx
gate opener
buzzer
camera systems
You have in mind a companion for intercom and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of intercom in all years. Click on graph for more.
intercom
customer.io
mixpanel