Comet vs Dia
Price, platforms and features side by side. The table says where each price was read and when.
Comet
Perplexity's AI browser with an assistant that acts across tabs
Dia
AI browser for work that answers questions across tabs and tools
Where they differ
- Comet starts at $20.00 (lowest Perplexity Pro in-app purchase; billing basis not shown). Dia starts at $20 per month (Better Answers).
- Only Comet lists Windows, iOS and Android apps.
- Dia is end-to-end encrypted, according to its own site.
- Comet also covers AI search and AI agents.
At a glance
| Comet | Dia | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | $20.00 (lowest Perplexity Pro in-app purchase; billing basis not shown) | $20 per month (Better Answers) |
| Free plan | Comet is listed as free on the US App Store and Google Play. The store listings do not state the limits of free use. | Better Browser: the browser with profiles and tab groups, split view, picture-in-picture video, a built-in ad and tracking blocker and cross-device sync, but no AI features. |
| Free trial | None listed | 14-day free trial of the Better Days plan for new users, no credit card required |
| macOS | ||
| Windows | ||
| iOS | ||
| Android | ||
| Made by | Perplexity AI, Inc. | The Browser Company of New York |
| Price read from | apps.apple.com | diabrowser.com |
| Checked | Oct 5, 2026 | Oct 5, 2026 |
Who each one suits
Comet
- People who want an assistant to carry out multi-step web tasks
- Summarizing research spread across many open tabs
- Perplexity subscribers who want its AI search inside the browser
Dia
- Mac users whose work is spread across Slack, Notion, Google Workspace and Teams
- People who want a daily brief and meeting prep prepared for them
- Arc users moving to the company's newer browser
Worth knowing
Comet
- The App Store lists Perplexity Pro at $20.00 and $200.00 and Perplexity Max at $200.00 as in-app purchases, without stating a billing period.
- Google Play lists in-app purchases from $4.99 to $249.99 per item, and neither store says which features or limits depend on a paid plan.
- Perplexity's website could not be read when checked, so Mac and Windows availability comes from press coverage rather than a vendor page.
Dia
- The free Better Browser plan has no AI features; chat needs Better Answers at $20 per month, and the Morning Brief and reports need Better Days at $100.
- Paid usage is metered in Tasks. When the monthly allowance runs out, AI features pause unless extra usage is bought in $20 credit blocks.
- Dia is available for macOS only; the site lists Windows as coming soon.
- Paid plans began rolling out to new Mac users on August 17. Existing users keep free access until they get at least 30 days' notice.
Key features
Comet
- Comet Assistant
- A built-in assistant takes on assigned tasks such as shopping, scheduling and research. Its actions are shown as it works, and the user can step in at any time.
- AI search with page context
- AI search is built into the browser and uses the context of the page being viewed, so questions can be asked and answered without leaving the site.
- Summaries across tabs
- Smart summarization condenses content from all open tabs at once, not only the page currently on screen.
- Voice mode
- On mobile, voice mode lets a person talk to the assistant to find information across the tabs they have open.
- Built-in ad blocker
- An ad blocker removes spam and pop-up ads on mobile as on desktop, with a whitelist for sites the user trusts.
Dia
- Chat with context from tabs and tools
- On paid plans, a question asked on any page is answered using open tabs and connected tools such as Slack, Notion, Google Workspace and Microsoft Teams.
- Morning Brief
- A daily brief lays out the calendar, inbox and key links before the workday starts. It is part of the Better Days plan.
- Reports, decks and recaps
- Dia gathers context scattered across tools into a shareable report or a slide deck with headers and layout. These are part of the Better Days plan.
- Meeting prep
- Before a call, Dia opens the meeting page, agenda, notes and related documents and shows a countdown to the start time.
- Profiles, tab groups and split view
- Profiles keep work, freelance and personal tabs, logins and AI separate. Related tabs are grouped under descriptive names, and split view layouts are remembered.
- Privacy controls
- Ad and tracker blocking are built in, memory and chat personalization can be switched off, and synced data is end-to-end encrypted. Dia for Work adds SSO and admin tools.
Plans
Comet
Free$0
The browser with the Comet Assistant, AI search, voice mode on mobile and a built-in ad blocker. Usage limits are not stated on the store listings.
Perplexity Pro$20.00 or $200.00
billing basis not shown on the App Store listing
Perplexity's paid subscription, listed twice as an in-app purchase at $20.00 and $200.00. The listing does not say what it adds in Comet.
Perplexity Max$200.00
billing basis not shown on the App Store listing
Perplexity's higher subscription tier, sold as an in-app purchase. The listing does not say what it adds in Comet.
Dia
Better Browser$0
The browser with no AI features: profiles and tab groups, split view, picture-in-picture video, ad and tracking blocking and cross-device sync.
Better Answers$20
per month
Adds chat on any page with context from tabs and connected tools, within a monthly usage allowance measured in Tasks.
Better Days$100
per month
6x the usage of Better Answers, plus the daily Morning Brief, meeting prep and follow-up, and generated reports, decks and recaps.
