Side-by-side comparison · AI Browsers & Agents
Dia vs Comet
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 2 tools. Add one more if you like.
At a glance
Overview
| Attribute | Dia | Comet |
|---|---|---|
| In one line | A work browser from the makers of Arc that answers questions from your tabs and apps. | Perplexity's free web browser with an assistant that reads your tabs and does tasks. |
| Pricing model | Freemium | Freemium |
| Starting price | $10 to $20/mo (Dia's page shows both) | $5/mo |
| Free plan | Yes | Yes |
| Works with Claude Code | No | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Dia | Comet |
|---|---|---|
| Overall rating | 3.6 | 3.9Winner |
| Ease of useHow quickly someone non-technical gets value from it. | 4.5 | 4.5 |
| FeaturesHow completely it covers the job it's built for, and how well the pieces fit together. | 3.5 | 4.0 |
| Output qualityHow good the results are before you fix them. | 4.0 | 3.5 |
| Value for moneyWhat you get for the price, including the free plan. | 2.5 | 4.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 3.5 | 3.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Dia | Comet |
|---|---|---|
| Access & platform | ||
| Free plan | Yes | Yes |
| Mobile app | No | Yes |
| Desktop app | Yes | Yes |
| Browser extension | No | Yes |
| API access | No | No |
| Teams & business | ||
| Team workspace | Yes | Yes |
| Enterprise plan or SSO | Yes | Yes |
| Connects to other apps | Yes | Yes |
| Open source or self-hosted | No | No |
| AI abilities | ||
| Works with your files | Yes | Yes |
| Understands images | Yes | Yes |
| Makes images | No | No |
| Makes video | No | No |
| Writes code | No | No |
| Runs agents or automations | No | Yes |
| Learns your brand or style | No | No |
| Works in many languages | Yes | Yes |
| Capabilities score | 8/ 17 | 11/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Dia | Comet |
|---|---|---|
| Plans | Better Browser Free People who want a tidy browser without AI. | FreeOur pick Free Everyday browsing with an assistant for summaries and questions. |
Better AnswersOur pick $10 to $20/mo (Dia's page shows both) Anyone who wants the AI chat day to day. | Comet Plus $5/mo Readers who want partner publishers' paywalled articles. | |
Better Days $100/mo Heavy users who want the full workday assistant. | Perplexity Pro $20/mo, or $200/yr Anyone who wants the agent to do tasks for them. | |
Dia for Work See website Companies rolling it out to staff. | Perplexity Max $200/mo, or $2,000/yr Heavy users running many tasks in the background. | |
| Which plan to pick | Use the 14-day trial properly, then decide if the chat alone is worth $20 a month to you. Better Days at $100 only makes sense if the Morning Brief and meeting prep save you real time every day. Existing users keep their free AI for now, with 30 days' notice before that changes, and Windows users aren't on the paid plans yet. | Use it free: the sidebar assistant alone is worth having, and most people never need more. Pro makes sense if you want Perplexity's research tools anyway, but don't buy it just for the browser agent, since Pro's credits are a one-off bundle. Nobody needs Max just for the browser. |
Key features
Pros and cons
| Attribute | Dia | Comet |
|---|---|---|
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Who each one is for
| Attribute | Dia | Comet |
|---|---|---|
| Best for |
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Questions people ask
Which is better, Dia or Comet?
Comet scores highest overall in our ratings (Dia 3.6/5 and Comet 3.9/5). Dia is best for asking questions across several open tabs and A morning summary of calendar, email and tasks. Comet is best for summarising long pages, PDFs and videos and comparing products or suppliers across tabs.
Which is cheaper, Dia or Comet?
Dia: There's a free plan, and paid plans start at $10 to $20/mo (Dia's page shows both). Comet: There's a free plan, and paid plans start at $5/mo.
How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.
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