Rainbow

Overview

Rainbow combines persistent one-to-one and group chat, presence, task management, voice and video calling, screen or app sharing, and file sharing. Telephony features include PBX control, phone presence, call logging, VoIP, caller identification, call forwarding and voicemail on eligible plans. That range can consolidate communication tools, especially where existing phone infrastructure matters; it is less compelling for teams whose central need is larger video meetings.

Deployments can be cloud, on-premises or hybrid. The service is available in more than 75 countries and 22 languages, with web, Windows, macOS, Android, iPhone, iPad and Android TV apps.

Key features

Telephony, integrations and APIs

Hybrid telephony connects with OmniPCX Enterprise and OXO Connect, with third-party CTI and Media Bridge integrations for Cisco, NEC, Mitel and Asterisk. Office integrations include Chrome Click2Call, Rainbow Telephony for Microsoft Teams, Microsoft 365 Exchange Online or Google Calendar, and an Outlook plug-in. This makes Rainbow a better match for teams extending an existing PBX or Microsoft and Google workflows than for those seeking a standalone meeting service.

The CPaaS platform exposes APIs for contact management, chat, voice, video, screen sharing, file storage, group collaboration and automation bots. Production use includes monthly allowances of 2,000 administration API calls, 5,000 Bots and Resource API calls, 500 WebRTC minutes and 5 GB of storage before invoicing. Those quotas give developers room to build and evaluate integrations, but API-heavy deployments should account for usage beyond them.

Security and support

Rainbow states AES-256 encryption at rest and in transit, region-based data residency, and SAML or OIDC single sign-on across the listed plans. Its compliance capabilities include ISO/IEC 27001, French HDS, GDPR, ANSSI CSPN, Spain ENS, Italy AgID, HIPAA, FERPA and UK NHS support. Business and Enterprise include 24/7 support, a 20-minute first response time and a 99.9% guaranteed uptime SLA; Essential relies on a digital Help Center. The higher tiers therefore make more sense where response commitments and uptime matter operationally.

Pricing

Rainbow uses a freemium model, with plans priced in EUR:

• Rainbow Essential — 0.00 EUR per free. Includes one administrator, one-to-one audio, video and screen sharing, 1 GB storage and bubbles for up to 20 users. It suits an individual administrator or a small team evaluating basic collaboration, but the one-to-one sharing scope and Help Center support are meaningful constraints.
• Rainbow Business — 2.00 EUR per month, billed per user. Retains one-to-one audio, video and screen sharing, 1 GB storage and 20-user bubbles, and adds an SLA. It fits teams that want the service commitment without needing larger sharing groups; it does not expand the collaboration limits shown for Essential.
• Rainbow Enterprise — 4.00 EUR per month, billed per user. Raises audio, video and screen sharing to up to 10 users, storage to 20 GB and bubbles to 100 users, with an SLA. It is the clearest fit for larger teams, though the 10-user sharing ceiling still rules it out for bigger calls.

Some offers provide free trials or demonstrations, specifically Rainbow Hub and the Rainbow Telephony for Microsoft Teams connector. The meeting participant limit is two, so teams planning broader meetings should not treat Rainbow's collaboration plans as a substitute for a larger-meeting service.

Platforms

Rainbow supports Android, iOS, macOS, web and Windows, as well as an API. The combination gives distributed teams several client options and lets developers build against the service.

Who it's for

Rainbow is aimed at businesses from small companies to multinational organizations. It is strongest for teams that need messaging and calling in one service while retaining cloud, on-premises or hybrid deployment options, PBX connectivity, or CPaaS access. A team primarily looking for large video meetings should look elsewhere: the stated meeting limit is two participants, and Enterprise sharing is capped at 10 users.

Pros and cons

• Pro: Broad telephony reach. PBX connectors for OmniPCX Enterprise and OXO Connect, plus CTI and Media Bridge integrations for Cisco, NEC, Mitel and Asterisk, help organizations preserve existing phone systems.
• Pro: Useful developer surface. CPaaS APIs span communications, storage and automation, with defined monthly production allowances.
• Pro: Tiered support and SLA. Business and Enterprise include 24/7 support, a 20-minute first response and 99.9% guaranteed uptime.
• Con: Small meeting and sharing ceilings. Meetings are limited to two participants, while Enterprise audio, video and screen sharing tops out at 10 users.
• Con: Entry tiers remain constrained. Essential and Business both provide 1 GB storage, 20-user bubbles and one-to-one sharing; Business adds an SLA rather than broader collaboration limits.
• Con: CPaaS usage can incur charges. Monthly API, WebRTC and storage allowances are finite before invoicing.

Alternatives

Rainbow sits among Unified Communications Software. Choose another option when its stated pricing, meeting scope or deployment emphasis better matches the job:

• Dialpad Support is a paid alternative with a free trial and apps across mobile, desktop, web and extension platforms.
• Sangoma PBXact is a paid option with a self-hosted platform as well as cloud and device clients; its stated PBXact Cloud 3 Year Plan carries a 36-month commitment and requires at least four Full Extensions.
• Microsoft Teams is worth comparing for its free plan, which supports 100 participants, 60-minute group meetings and 5 GB cloud storage.
• Webex App offers a free plan with meetings up to 100 attendees for up to 40 minutes, making it a more suitable stated option for larger free meetings.
• 3CX has a free 4SC Basic plan for 10 users and four simultaneous calls; its license must be manually renewed each year.
• Hubgets offers a free plan for 20 users, while its Startup plan is priced at 2.90 USD per year and supports 1,000 users, 5 GB per user and 20,000 messages per thread.
• Mitel Secure Cloud is another option for teams considering Mitel's Essential, Elite or other service packages.
• Zoom Workplace is a freemium alternative with a Basic plan capped at 100 participants and 40 minutes per meeting.

Verdict

Choose Rainbow if your organization needs collaboration and telephony together, particularly with PBX integration, hybrid deployment or CPaaS development in scope. Its strongest case is the combination of broad telephony connectivity and tiered collaboration plans; the main reason to look elsewhere is the two-person meeting cap and the limited sharing groups, even on Enterprise.