In short
How they differ.
Worked out from the makers' own pages, read Oct 20, 2026. Prices change; check before you pay.
- Only Dia has a free plan.
- Dia's cheapest paid plan is cheaper: $100 a month against $200.
- Comet also has a phone app.
Side by side
The details.
| Dia | Comet | |
|---|---|---|
| Made by | The Browser Company of New York (Atlassian) | Perplexity |
| What it says it is | “Dia is the browser for better days at work.” | “Comet browser by Perplexity is the AI browser that acts as a personal assistant.” |
| Free plan | YesFree 'Better Browser' tier has 'no AI features'. | Not statedThe Comet page we read did not state whether it is free. |
| Plans | Better Answers: not in US$Better Days: $100 a month | Max: $200 a month |
| Runs on | macOS, Windows | macOS, Windows, iOS, Android |
| Latest update | Welcoming The Browser Company to Atlassian, Sep 4, 2025 | — |
| Its terms | — | “This allows attackers to embed indirect prompt injection payloads that the AI will execute as commands.”In its terms · Brave blog |
| Disputes | None on file | None on file |
| Sources | Prices, Oct 20, 2026 · Description · company-reported | Prices, Jun 18, 2026 · Description · company-reported |
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