Comparison Cereal vs Comet
Cereal vs Comet: the free AI browser agent that runs on your machine.
Comet is Perplexity’s own browser, with its assistant on Perplexity’s servers and the bigger features on paid plans. Cereal’s AI browser agent works in the Chrome you already use, with your model and your key.
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Goal Notify me when the PS5 Pro on bol.com drops below €450
- ✓ Opened bol.com in your Chrome
- ✓ Rejected cookie banner
- ✓ Searched “PS5 Pro”, opened product
- ✓ Learned: price below €450
● Repeat · 0 model calls
[ 01 / compare ]
How they compare.
| Cereal (coming soon) | Comet | |
|---|---|---|
| Where it runs | Your machine, in the free Cereal desktop app. | Comet’s browser on your device; the assistant runs on Perplexity’s servers. checked 2026-10 · perplexity.ai |
| Which browser | Your own Chrome, in a window you can watch, with a separate profile per task. No extension, no new browser. | Comet, Perplexity’s own Chromium-based browser. You switch browsers. checked 2026-10 · perplexity.ai |
| Model / BYOK | Bring your own model: Anthropic, Google Gemini, OpenAI, OpenRouter, or any OpenAI-compatible server. Your API key goes only to the AI provider you pick. | Perplexity’s models through your Perplexity plan. No own key. checked 2026-10 · perplexity.ai |
| Local models | Yes: Ollama and LM Studio (best effort; tested on Claude, other models may vary). | No. checked 2026-10 · perplexity.ai |
| Repeats without the model | Yes, after the first run: Repeat replays what it learned without calling the AI. If the site changes, the AI picks up where replay stopped. | Not stated by vendor. checked 2026-10 · perplexity.ai |
| Asks before buying/sending | Asks for your OK before it buys, pays, deletes or sends anything, including on repeat runs. | Yes: pauses for your confirmation before placing final shopping orders and sending emails or messages. checked 2026-10 · perplexity.ai |
| Price | Free. You pay your AI provider directly, or nothing with a local model. | Browser free. Pro from $17/mo, Max from $167/mo (billed annually). checked 2026-10 · perplexity.ai |
| Platforms | Tested on macOS and Linux · needs Google Chrome | Mac, Windows, iOS and Android. checked 2026-10 · perplexity.ai |
[ 02 / fit ]
When to pick Comet instead.
- You want a whole AI browser to replace the one you use now.
- You already pay for Perplexity Pro or Max.
- You want the assistant on your phone too.
[ faq ]Questions.
Questions.
Answered.
Q/01 Is it free?
Yes. Free, and free to run: use a free tier such as Gemini’s, a local model, or your own paid key. You pay your AI provider directly, typically cents to a few tens of cents per run (an estimate). Hard limits stop every run at $2 and every task at $5 by default, and you can change them. Free tiers may let the provider use your data; a paid key or local model keeps it private.
Q/02 Where do my pages and key go?
Nothing passes through Cereal: your key and pages go only to the model provider you pick, or stay on your machine with a local model. Your passwords are typed by Cereal, not the AI: the model only sees a placeholder, and secret values are removed from logs.
Q/03 What happens when the site changes?
After the first run, Repeat replays what it learned without calling the AI, so routine checks cost nothing. If the site changes, the AI picks up where replay stopped.
Q/04 Do I have to switch browsers?
Not with Cereal. Its AI browser agent runs in your own Chrome, in a window you can watch, with a separate profile per task, so sign-ins stick between runs. Comet is a browser of its own, so you switch to it.
Q/05 Do I need a subscription?
Not for Cereal: you pay your AI provider directly, or nothing with a local model. Comet’s browser is free; its paid plans start at Pro (checked 2026-10).