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Dia vs Perplexity Comet

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Both start at $20. Both have a free tier.

DiaMac browser whose assistant answers across your open tabs, Slack, Notion, calendar and GitHubPerplexity CometPerplexity's Chromium-based browser with an AI agent that reads pages, fills forms, and drafts email across tabs.

Side by side

FactDiaPerplexity Comet
CategoryBrowser Extensions & CopilotsBrowser Automation Agents
Pricing modelFreemiumFreemium
Starts at$20 month$20 month
Public APINoNo
PlatformsmacOSmacOS, Windows, iOS, Android
CompanyThe Browser CompanyPerplexity AI, Inc.
Launched—2025
Last verifiedSep 6, 2026Sep 1, 2026

What our research says

Dia

The bet is that an assistant living inside the browser, with your tabs and connected work tools already in reach, beats pasting context into a separate chat window. It mostly holds up for people whose work is genuinely spread across Slack, Notion and Workspace. The costs are real: Apple silicon only, and the tier with daily briefings is $100 a month.

Pros

  • The assistant reads open tabs and connected tools instead of sitting in a separate window
  • The free tier is a usable browser on its own
  • Privacy defaults are on: tracker and ad blocking enabled, memory optional, sync end-to-end encrypted
  • Profiles and named tab groups keep work and personal contexts apart

Cons

  • Apple silicon Macs on macOS 14+ only, with no other platform available
  • $100/month for the briefing tier is steep next to standalone assistants
  • The useful features require broad OAuth access to Slack, Notion, Calendar and Workspace
  • No API

Perplexity Comet

Comet is a real browser replacement, not a bolt-on extension, and its tab-reading and task-execution features go further than typical AI sidebar tools. The free tier is genuinely usable day to day, but the features that most justify switching browsers, like autonomous background tasks, sit behind the $200/month Max plan.

Pros

  • Full standalone browser, not a plug-in, with tab-aware summarization
  • Can execute multi-step tasks like form-filling and drafting emails, not just answer questions
  • Free tier requires no payment to start using core AI browsing features

Cons

  • Autonomous background agents and the highest usage limits require the $200/month Max plan
  • Switching browsers entirely is a bigger commitment than installing an extension
  • Ties users into Perplexity's own search index and models

Which one fits

Choose Dia if you need

  • Mac users whose day runs across Slack, Notion, Calendar and GitHub
  • people who want briefings and synthesis without leaving the browser
  • Arc users looking for its successor

Choose Perplexity Comet if you need

  • Perplexity subscribers who want the AI assistant built into browsing itself
  • Users comfortable granting a browser agent access to fill forms and read pages

More comparisons

Browse all Browser Extensions & Copilots →