Perplexity Comet vs Dia
Published · Updated
Which is better, Perplexity Comet or Dia?
It depends on what you want done. Pick Perplexity Comet if you want an AI browser that's free on Mac, Windows, iPhone and Android and does great research. Pick Dia if you want help reading and researching in your browser, not an agent that acts. Both are AI browsers. Prices as of November 2026: Perplexity Comet, from $17/mo; Dia, from $10/mo.
On our rubric, Perplexity Comet scores higher, 7.6 to 5.9. It handles 2 of our 6 everyday errands fully on its own, to Dia's 1. Here's where each one wins.
Choose Perplexity Comet if you want an AI browser that's free on Mac, Windows, iPhone and Android and does great research.
Visit Perplexity CometErrands, side by side
| Errand | Perplexity Comet | Dia |
|---|---|---|
| Book reservations, rides and travel | With your OK | No |
| Shop and check out | With your OK | No |
| Handle email and calendar | With your OK | With your OK |
| Fill forms and click through websites | Yes | No |
| Cancel subscriptions, chase refunds, lower bills | No | No |
| Research and compare | Yes | Yes |
Scores side by side
| Criterion | Perplexity Comet | Dia |
|---|---|---|
| Gets it done (30%) | 8.0 | 4.0 |
| Reach (15%) | 8.5 | 6.0 |
| Knows you (15%) | 7.0 | 7.0 |
| Safety & control (15%) | 6.5 | 7.0 |
| Value (15%) | 8.5 | 7.0 |
| Trust (10%) | 6.5 | 7.0 |
| Overall | 7.6 | 5.9 |
Where they work
| Clicks through websites for you | ||
|---|---|---|
| Works in the background or on a schedule | ||
| Remembers you | ||
| Works over text messages | ||
| Talks by voice | ||
| Phone app |
Price and fine print
| Perplexity Comet | Dia | |
|---|---|---|
| Type | AI browser: ai browser | AI browser: ai browser |
| Made by | Perplexity | The Browser Company (Atlassian) |
| Our rank | #1 of ai browsers | #3 of ai browsers |
| Price | From $17/mo (as of November 2026) | From $10/mo (as of November 2026) |
| Free plan | Yes: the browser and assistant are free, with limited agent use (as of November 2026) | Yes: the browser, but no AI features (as of November 2026) |
| Refunds | Not stated | Not stated |
| Best for | People who want an AI browser on every device for free. | People who want an AI browser for reading and research, not errands. |
Perplexity Comet: pros and cons
- Free on Mac, Windows, iPhone and Android
- Excellent research with sources
- Acts on the page you're looking at
- Pro is $17 a month billed yearly
- Frequent agent tasks need a paid plan, and free limits aren't published
- Background assistants are on the $200 Max plan
- Prompt-injection attacks against AI browsers, Comet included, have been demonstrated
- Switching browsers is a big change for a feature
Dia: pros and cons
- Chat with your open tabs
- Personal memory
- Mac and Windows
- Morning Brief
- Doesn't complete errands on websites
- Free plan has no AI features
- Shifting toward business use
- Heavy use needs the $100 plan or $20 credit top-ups
Perplexity Comet vs Dia: questions
Is Perplexity Comet better than Dia?
On our rubric, Perplexity Comet scores higher (7.6 vs 5.9). Dia is still the better pick if you want help reading and researching in your browser, not an agent that acts.
Which is cheaper, Perplexity Comet or Dia?
Perplexity Comet: from $17/mo, free plan: yes (as of November 2026). Dia: from $10/mo, free plan: yes (as of November 2026).