Cal.com vs Dia
Cal.com and Dia are both Productivity tools in our directory. This side-by-side comparison covers pricing, user ratings, supported platforms, key features and open-source status so you can decide which one fits your needs.
Side-by-side comparison
| Attribute | Cal.com | Dia |
|---|---|---|
| Vendor | Cal.com | The Browser Company |
| Rating | ★ 4.6 | ★ 4.4 |
| Pricing | Freemium | Freemium |
| Platforms | Web, API, Self-host | Desktop, macOS |
| Key features | Open-source booking, Self-host or cloud, Routing forms | Chat with the current page, Skills and actions, Calmer UI than Arc |
| Headquarters | San Francisco, USA | New York, USA |
| Founded | 2021 | 2025 |
| Open source | Yes | No |
Key differences
- Cal.com has a higher user rating (4.6★ vs 4.4★).
- Both Cal.com and Dia use a Freemium model.
- Cal.com is open source (its code is public), while Dia is proprietary.
- Cal.com runs on Web, API, Self-host; Dia runs on Desktop, macOS.
Frequently asked questions
Is Cal.com or Dia better?
By user rating, Cal.com scores higher (4.6★ vs 4.4★). Both are capable Productivity tools, so review the feature comparison for your use case.
Which is cheaper, Cal.com or Dia?
Both Cal.com and Dia use a Freemium pricing model.
Are Cal.com and Dia open source?
Cal.com is open source, while Dia is proprietary.