By Google DeepMindLondon, United Kingdom6 products across 6 categories
Built for this. Runs a multi-step search across dozens of sources and returns a structured, referenced report. Strong first pass on an unfamiliar field.
Free plan
Yes
Included in the free Gemini tier, with a limited number of reports
Month to month
$4.99/mo
Google AI Plus
Billed yearly
$4.17/mo
$49.99 a year, Google AI Plus plan −16%
Watch out: Searches the open web, not scholarly databases. It will miss paywalled literature a library search would find.
All plans (4)
Plan
Price
What you get
Free
$0
Included in the free Gemini tier, with a limited number of reports
Google AI Plus
$4.99/mo
2x the usage limits. Deep Research is part of the Google AI plans, not sold separately
Google AI Pro
$19.99/mo
4x the usage limits and the Pro model behind longer reports
Two things separate these and both are on every card.
Fit
Whether a tool is built for this job, a strong fit for it, or
able to do it without that being its focus.
Free plan
Whether there is a tier you can keep using rather than a
trial that expires.
The order
Fit first, then a free plan, then alphabetical. There is
no score, no weighting we decline to publish, and nothing on this site a company can buy.
Questions
What is the best ai for product research?
There is no single answer, which is why this page lists 4 rather than one: Perplexity, ChatGPT, Claude, Gemini Deep Research. 4 of them are built for this kind of work rather than able to do it. Start with a free one.
Which of these have a free plan?
4 of the 4: Perplexity, ChatGPT, Claude, Gemini Deep Research. Free means a real free tier you can keep using, not a trial that expires.
How was this list chosen?
By hand, from the 750 products this site tracks, and it is checked against the catalogue on every build — a product renamed or removed breaks the build rather than quietly disappearing from here. Nothing on this site can be paid for: no listing, no position, no wording.