Neither OpenVoice nor Zip Conferencing offers a free trial.
OpenVoice is designed for Large Enterprises, Medium Business and Small Business.
Zip Conferencing is designed for Large Enterprises, Medium Business and Small Business.
Pricing for OpenVoice Starts at $0.08/Month whereas for Zip Conferencing Starts at $12/Month.
Some top alternatives to OpenVoice includes GotoMeeting, FreeConferenceCall.com, Meetin.gs, FreeConference.com, grptalk, Qualified, Workvivo, Zip Conferencing, Free Conference Calling, No Cost Conference, TurboBridge and ConferenceCaller.com.
Some top alternatives to Zip Conferencing includes Zoom, eyeson, MyOwnConference, Qualified, Workvivo, Angle Audio, No Cost Conference, OpenVoice, Avaya Aura Conferencing, Snare and IFTTT.