Rainbow
Rainbow: A broad UC platform with a free basic tier and two-person meeting limits. Ranked #27 of 28 in Unified Communications Software by our editors (6.5/10); pricing: Free plan; best for small teams needing free basic UC.
At a glance
- Editor score6.5 / 10
- PricingFree plan
- Best forSmall teams needing free basic UC
- Free planYes
- Business callingYes
- Facts checked22 Sep 2026
Where it wins
- Combines messaging, calling, sharing, conferencing, and telephony
- Supports ALE, non-ALE PBXs, Microsoft, Google, Cisco, NEC, and Mitel
- Offers web, desktop, mobile, and CPaaS API access
Where it doesn't
- Meetings are limited to two participants
- Call recording is restricted to supported plans
- Advanced administration is limited to the Enterprise plan
Our verdict on Rainbow
Rainbow is a cloud-based unified communications platform from Alcatel-Lucent Enterprise for organizations that need workplace messaging, presence, audio and video calling, sharing, conferencing, and business telephony in one service. Its free plan makes it relevant to small teams seeking basic UC capabilities, while the Essential, Business, and Enterprise plans extend the platform with different combinations of storage, telephony, call recording, conferencing, and administration. Rainbow is available through web, Windows, macOS, iOS, Android, and API access.
Its ecosystem fit is a major consideration for buyers with an existing communications environment. Rainbow supports cloud and hybrid business telephony, automated attendant menus for Cloud PBX, and integrations with Alcatel-Lucent Enterprise systems including OXO Connect and OmniPCX Enterprise. It also connects with non-ALE PBXs and platforms such as Microsoft Teams, Microsoft 365, Google Calendar, Microsoft Outlook, Azure Active Directory, Cisco, NEC, Mitel, and Asterisk. CPaaS REST APIs add an option for organizations that need to connect communications capabilities with other systems.
Rainbow has broad UC coverage rather than a narrow focus: persistent one-to-one and group chat, contact management, audio and video calling, screen, application, and file sharing, scheduled and ad-hoc web conferencing, and telephony are all included across its feature set. The trade-off is that the verified meeting limit is two participants, which makes it less suitable for teams that need larger built-in meetings. Call recording and advanced administration also sit on higher tiers. Choose Rainbow for free basic UC or PBX-connected deployments; consider an alternative if larger meetings are central to daily work.
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Rainbow pricing
All 3 Rainbow plans and prices →
Rainbow fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Not verified |
| Business calling | Yes |
| Team messaging | Yes |
| Video meetings | Yes |
| Call recording | Yes |
| Auto attendant | Yes |
| Business SMS | Not verified |
| Meeting participant limit | 2 participants |
| Deployment | Cloud, Desktop, Mobile |
| Platforms | Web, Windows, macOS, iOS, Android |
| Compliance & security | ISO 27001, GDPR, HIPAA, SSO/SAML, 2FA |
| Support | Docs · 24/7 |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 13 integrations: Alcatel-Lucent OXO Connect, OmniPCX Enterprise, non-ALE PBXs, Microsoft Teams, Microsoft 365, Google Calendar … |
| Pricing | Free plan (source) |
| Website | openrainbow.com |
| Facts checked | 22 Sep 2026 |
Rainbow integrations
Rainbow lists 13 integrations on its own site.
- Alcatel-Lucent OXO Connect
- OmniPCX Enterprise
- non-ALE PBXs
- Microsoft Teams
- Microsoft 365
- Google Calendar
- Microsoft Outlook
- Azure Active Directory
- Google Chrome
- Cisco
- NEC
- Mitel
- Asterisk
Alternatives to Rainbow
- Microsoft TeamsA broad collaboration and communications workspace for Microsoft-centric organizations.9.4
- Webex AppA broad collaboration suite for meeting-heavy teams, with telephony depth concentrated in higher tiers.9.1
- Zoom WorkplaceA broad collaboration suite for teams that prioritize meetings over business calling.9.0
See all Rainbow alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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