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. Both are listed under Browser Extensions & Copilots, so this is a like-for-like comparison. Neither is ranked above the other — Flocci carries no sponsored placement.

Dia vs Firefox Smart Window — straight answers

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.

Dia compared with Firefox Smart Window: pricing tier, category, listed capabilities and links.
 DiaFirefox Smart Window
Pricing tierFree tier + paid plansFree
Free to startYesYes
CategoryAI Chat & AssistantsAI Chat & Assistants
TypeBrowser Extensions & CopilotsBrowser Extensions & Copilots
Listed capabilities
  • AI-native Chromium browser (from the makers of Arc) with AI chat built into every tab, not bolted on as a sidebar
  • Free for light AI use; a Pro tier lifts the usage caps
  • Now backed by Atlassian after its 2026 acquisition of The Browser Company
  • Built-in Firefox AI assistant that answers questions about the page and open tabs and searches browsing history in natural language
  • Switch models mid-chat: Google Gemini, Alibaba Qwen, OpenAI gpt-oss-120b, and Mistral Small 4 (added Sept 2026)
  • Free with no subscription; beta for macOS and Windows in the US, Canada and France, UK and Germany expected later
  • Conversations stay local by default; Mistral partnership uses zero data retention
Tagsdia browser, ai browser, browser company ai, agentic browser, free ai browser, chromium aifirefox smart window, free ai browser, firefox ai chat, mistral firefox, private ai browsing, browser with built-in ai
Websitediabrowser.comfirefox.com
Full pageDia details →Firefox Smart Window details →
AlternativesDia alternatives →Firefox Smart Window alternatives →

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