Rainbow alternatives

12 Windows apps in the same category as Rainbow, ranked by what they have in common and by popularity.

• 
  GanttProject

  Free desktop project management software

  Open source 3.3.3323 73.4K ↓ ★ 1.1K
• A
  Aircall Workspace

  Make, receive, and manage customer communications directly from your Mac or PC.

  Proprietary 1.19.0 bussiness, collaborate, collaboration
• 
  Todoist

  Become focused, organized, and calm with Todoist. The world’s #1 task manager and to-do list app.

  Proprietary 9.36.2 13.9K ↓ collaborate, collaboration, office
• 
  XrmToolBox

  XrmToolBox is a Windows application that connects to the Common Data Service for Apps (CDS).

  Open source 1.2026.9.78 7.5K ↓ ★ 653 crm
• 
  Lark

  The Next-Gen Collaboration Suite

  Proprietary 8.4.19 bussiness, collaboration, comunication
• L
  LiveChat

  The live chat software that gets the job done

  Proprietary 10.1.1 bussiness, collaboration, comunication
• 
  Cal

  Scheduling infrastructure for everyone.

  Open source 1.10.1 ★ 49.2K collaborate, collaboration
• 
  DooTask

  Lightweight task management tool

  Open source 1.10.38 ★ 5.6K collaborate, collaboration
• 
  Miro

  The innovation workspace where teams manage projects, design products, and build the future together.

  Proprietary 0.11.196 3.7K ↓ collaborate, collaboration
• S
  SalesIQ

  Interact with prospects and customers from the moment you power up your Windows system with the Zoho SalesIQ Windows app. Stay informed with real-time alerts and take swift action without needing to open the app.

  Proprietary 2.1.2 bussiness, collaborate, collaboration
• 
  Focalboard

  Focalboard is an open source, self-hosted alternative to Trello, Notion, and Asana.

  Open source 7.11.3 ★ 26.5K collaboration
• 
  t-clock

  Highly configurable Windows taskbar clock

  Other licence 2.4.4 5.9K ↓

Comparison

App	Licence	Version	Updated	GitHub stars	Chocolatey downloads
RRainbow	Proprietary	2.174.1.0	July 17, 2026	—	—
GanttProject	Open source	3.3.3323	November 8, 2026	1.1K	73.4K
AAircall Workspace	Proprietary	1.19.0	November 9, 2026	—	—
Todoist	Proprietary	9.36.2	November 3, 2026	—	13.9K
XrmToolBox	Open source	1.2026.9.78	September 30, 2026	653	7.5K
Lark	Proprietary	8.4.19	November 5, 2026	—	—
LLiveChat	Proprietary	10.1.1	July 29, 2025	—	—
Cal	Open source	1.10.1	January 18, 2026	49.2K	—
DooTask	Open source	1.10.38	October 29, 2026	5.6K	—
Miro	Proprietary	0.11.196	October 23, 2026	—	3.7K
SSalesIQ	Proprietary	2.1.2	October 13, 2025	—	—
Focalboard	Open source	7.11.3	September 15, 2023	26.5K	—
t-clock	Other licence	2.4.4		—	5.9K