3CX vs Rainbow

3CX is a business communications platform with web, desktop and mobile apps for Windows, Linux, macOS, iOS and Android. It includes an auto attendant, advanced call routing and voicemail transcription. The 4SC Basic Free plan is listed at free and includes 10 users and four simultaneous calls; its license must be renewed manually each year. Basic costs $300 a year, billed annually, and includes 40 extensions and eight simultaneous calls. The service also lists 40 included users. The maker is 3CX, founded in 2005. The supplied facts give Tampa, Florida, and Nicosia, Cyprus, as headquarters locations.

Rainbow is a cloud-based communication and collaboration platform for businesses, connecting people, objects and interactions through the cloud. Its tools include persistent one-to-one and group chat, presence information, task management, voice and video calls, screen or app sharing, and file sharing. Telephony features available on eligible plans include PBX control, phone presence, call logging, VoIP, caller identification, forwarding and voicemail. Office integrations include Google Chrome Click2Call, Rainbow Telephony for Microsoft Teams, Microsoft 365 Exchange Online or Google Calendar, and an Outlook plug-in. Hybrid telephony can connect with OmniPCX Enterprise, OXO Connect and third-party integrations for Cisco, NEC, Mitel and Asterisk. Rainbow offers cloud, on-premises and hybrid deployments, and its services are available in more than 75 countries and 22 languages. The plans list AES-256 encryption, region-based data residency and SAML or OIDC single sign-on. Essential costs nothing; Business costs €2 a month per user, and Enterprise costs €4 a month per user. Business and Enterprise include 24/7 support and an uptime SLA; Essential includes a digital Help Center.