# Dia vs Firefox Smart Window

Dia is freemium — a usable free tier with paid plans above it. Firefox Smart Window is free, with no paid plan attached.

| | Dia | Firefox Smart Window |
|---|---|---|
| Pricing | Free tier + paid plans | Free |
| Free to start | Yes | Yes |
| Category | AI Chat & Assistants | AI Chat & Assistants |
| Type | Browser Extensions & Copilots | Browser Extensions & Copilots |
| Best for | AI-native Chromium browser (from the makers of Arc) with AI chat built into every tab, not bolted on as a sidebar | Built-in Firefox AI assistant that answers questions about the page and open tabs and searches browsing history in natural language |

## FAQ

### Dia vs Firefox Smart Window: what is the difference?

Dia is freemium — a usable free tier with paid plans above it and is listed for AI-native Chromium browser (from the makers of Arc) with AI chat built into every tab, not bolted on as a sidebar. Firefox Smart Window is free, with no paid plan attached and is listed for built-in Firefox AI assistant that answers questions about the page and open tabs and searches browsing history in natural language. Both sit in Browser Extensions & Copilots.

### Is Dia or Firefox Smart Window cheaper to start with?

Firefox Smart Window is the cheaper starting point: it is free, with no paid plan attached, while Dia is freemium — a usable free tier with paid plans above it. Pricing tiers here come from the catalog, not from a promotional page.

### Which should I choose, Dia or Firefox Smart Window?

Choose Dia if you need AI-native Chromium browser (from the makers of Arc) with AI chat built into every tab, not bolted on as a sidebar; choose Firefox Smart Window if you need built-in Firefox AI assistant that answers questions about the page and open tabs and searches browsing history in natural language. Flocci AI Tools does not rank one above the other — it shows both feature sets side by side and lets the requirement decide.

## Related

- [Dia](https://aitools.flocci.in/tool/dia)
- [Firefox Smart Window](https://aitools.flocci.in/tool/firefox-smart-window)
- [Dia alternatives](https://aitools.flocci.in/alternatives/dia)
- [Firefox Smart Window alternatives](https://aitools.flocci.in/alternatives/firefox-smart-window)
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Source: Flocci AI Tools — https://aitools.flocci.in/compare/dia-vs-firefox-smart-window

Facts last verified: October 2026