What is the main difference between Cal.com and Rallly?

Cal.com and Rallly are both appointment scheduling tools but differ in their approach, features, and target audience. Compare their GitHub stats, technology stack, and community adoption to make the best choice.

Which is better: Cal.com or Rallly?

The choice between Cal.com and Rallly depends on your specific needs, technical requirements, and team preferences. Both are quality open source solutions with active communities.

Can I migrate from Cal.com to Rallly?

Migration between Cal.com and Rallly is possible but requires careful planning. Consider data export/import capabilities, feature parity, and potential workflow changes.

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Cal.com vs Rallly

Learn how Cal.com and Rallly differ in their key features, development activity, technology stack and community adoption, so you can decide which of these appointment scheduling tools is best for you.

Cal.com

Cal.diy is the community edition of Cal.com for personal self-hosting, with calendar sync, video conferencing, payment support, and a REST API.

Visit Cal.com

Rallly

A user-friendly, open-source tool for coordinating events and meetings without the hassle of back-and-forth emails or messages.

Visit Rallly

Detailed Comparison

Both Cal.com and Rallly have their unique strengths and serve similar purposes effectively. Consider your specific needs regarding popularity, activity, technology, maturity, licensing and features when making your decision.

Cal.com wins

Community & Popularity

Cal.com significantly outpaces Rallly in community adoption with 46,750 stars compared to 5,178 stars on GitHub. This 9.0x difference suggests Cal.com has a much larger and more active community. In terms of developer contributions, Cal.com has 14,539 forks, indicating strong developer engagement.

Comparable

Development Activity

Both projects show recent activity, with Cal.com last updated 3 days ago and Rallly 9 hours ago.

Comparable

Technology Stack

Both tools share common technology foundations, being built with JavaScript, CSS, Bash, Typescript, JSX, Next.js. However, they differ in their additional technology choices: Cal.com uses PHP, NestJS.

Rallly wins

Project Maturity

Rallly has been in development longer, starting 11 years ago, compared to Cal.com which began 5 years ago. This 6.2-year head start suggests Rallly may have more mature features and established processes.

Cal.com wins

Licensing

Cal.com uses the MIT license, which is more permissive than Rallly's AGPL-3.0 license, potentially offering greater flexibility for commercial use and integration.

Comparable

Use Cases & Features

Both tools serve similar use cases in Appointment Scheduling.

Comparable

Hosting & Deployment

Both Cal.com and Rallly offer self-hosting capabilities, giving you full control over your data and infrastructure.

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Cal.com vs Rallly: A Detailed Comparison of Appointment Scheduling Tools in 2026

Cal.com vs Rallly

Learn how Cal.com and Rallly differ in their key features, development activity, technology stack and community adoption, so you can decide which of these appointment scheduling tools is best for you.

Cal.com

Cal.diy is the community edition of Cal.com for personal self-hosting, with calendar sync, video conferencing, payment support, and a REST API.

Visit Cal.com

Rallly

A user-friendly, open-source tool for coordinating events and meetings without the hassle of back-and-forth emails or messages.

Visit Rallly

Detailed Comparison

Both Cal.com and Rallly have their unique strengths and serve similar purposes effectively. Consider your specific needs regarding popularity, activity, technology, maturity, licensing and features when making your decision.

Cal.com wins

Community & Popularity

Comparable

Development Activity

Both projects show recent activity, with Cal.com last updated 3 days ago and Rallly 9 hours ago.

Comparable

Technology Stack

Rallly wins

Project Maturity

Cal.com wins

Licensing

Cal.com uses the MIT license, which is more permissive than Rallly's AGPL-3.0 license, potentially offering greater flexibility for commercial use and integration.

Comparable

Use Cases & Features

Both tools serve similar use cases in Appointment Scheduling.

Comparable

Hosting & Deployment

Both Cal.com and Rallly offer self-hosting capabilities, giving you full control over your data and infrastructure.

Other tool comparisons to consider