AI browsers and extensions
Comet: review, pricing, data and alternatives
Comet is a browser that summarizes pages and compares information across tabs. It serves people who want to write emails or fill out forms with an assistant while browsing. A free tier exists; the first paid plan costs $20 per month. Access and transparency score: 55/100, #1 of 6 in its category.
What is Comet?
Comet is a browser that summarizes pages and compares information across tabs. It serves people who want to write emails or fill out forms with an assistant while browsing.
According to its documentation, Comet lets you:
- summarize the page being viewed
- compare information across multiple tabs
- write emails from the browser
- fill out forms with an assistant
We file it under AI browsers and extensions, the category of tools to use AI right in your browser, and it also overlaps with aI search engines and productivity and organisation. The category lists 6 verified tools on this site.
The publisher is Perplexity AI, Inc., based in United States. The service launched in 2025.
Who is it for?
It is for anyone who wants to use AI right in your browser.
Comet is a good candidate if:
- you want to try before paying
- you also work from your phone
The best test is a concrete case from your daily work: if the tool does not beat your current method within a week, move on to an alternative.
How much does Comet cost?
Pricing model: freemium (limited free use, then paid). A free plan is offered, usually limited in volume or features.
The first paid plan costs $20 per month (Perplexity Pro, standard monthly rate; the Comet browser is available for free), according to the pricing page, checked on October 24, 2026.
Per month, that is close to the category median ($19.9 per month, based on tools with a published price).
To estimate what the same work would cost done directly with an AI model, use our API price calculator. Prices change often: always check the official site before subscribing.
Data and privacy
The publisher does not clearly state where data is hosted. Assume your content may leave your region.
For professional use, check that a data processing agreement (DPA) is offered, and do not send customers' personal data or confidential documents without one.
No export feature is documented: keep a copy of your content elsewhere.
Three habits apply to every AI tool:
- turn off the use of your content for training if the option exists
- use a work account separate from your personal account
- review everything the tool produces before publishing or sending it
Platforms, languages and API
Comet runs on: Windows, macOS, iPhone and iPad, and Android.
Interface languages: English, French, German, Spanish, Italian, Japanese, Korean, and Portuguese.
API availability is not documented.
How we scored it
Our 55/100 score does not judge output quality: it measures what can be publicly verified about access to the tool, its openness and how far the publisher can be trusted.
| Criterion | Points | What counts |
|---|---|---|
| Access | 30/30 | free tier, published price, French interface |
| Openness | 0/30 | API, data export, open code |
| Trust | 25/40 | identified publisher, declared hosting, age, presence in reference lists |
The full calculation is explained on our method page.
Comparison with alternatives
Comet against other tools in the aI browsers and extensions category:
| Tool | Free | Entry price | API | Score |
|---|---|---|---|---|
| Comet | Yes | $20 per month | – | 55 |
| Sider | Yes | not published | – | 55 |
| Monica | Yes | $99 per year | Yes | 55 |
| Merlin | Yes | $19 per month | No | 48 |
| Dia | Yes | $20 per month | – | 40 |
| Opera Neon | Yes | $19.9 per month | – | 40 |
Verdict
Comet is among the most accessible and transparent tools in its category.
Strengths
- Free tier to try it
- Available on many platforms
Limitations
- Data hosting not disclosed
- Data export not documented
Avoid if…
- You handle sensitive personal data without a processing agreement
- You need to easily retrieve your full history
Alternatives
- Siderfree tier
- Monicafree tier
- Merlinfree tier
- Diafree tier
- Opera Neonfree tier
Categories and jobs
Learn more
Frequently asked questions
Is Comet free?
Yes, a free plan exists, with usage limits. The first paid plan costs $20 per month.
Where is Comet data stored?
The publisher does not clearly say so in its public documentation.
Does Comet have an API?
It is not documented.
What are the alternatives to Comet?
In the same category: Sider, Monica, Merlin, and Dia.
Comet or Sider: which one to choose?
Our score is 55/100 for Comet and 55/100 for Sider. Try both on the same task before paying.
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Neutrality. No affiliate links. No vendor pays to be reviewed, rated or ranked. Reviews are directed by François Chollet, neutral and factual, and every data point is dated and sourced. How we score