By Google DeepMindLondon, United Kingdom6 products across 6 categories
Built for this. You upload the sources and it answers only from them, linking every sentence to the passage it came from. The strongest verification pattern here.
Free plan
Yes
Free, and the core product is not gated: what a paid plan buys is headroom — a bigger notebook
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: Deliberately limited — it will not answer what your documents do not cover, and cannot tell you whether they are any good. Paid headroom comes from a Google AI subscription rather than a plan of its own.
All plans (4)
Plan
Price
What you get
Free
$0
Free, and the core product is not gated: what a paid plan buys is headroom — a bigger notebook, more sources per notebook and higher limits on Audio and Video Overviews and Slides
Google AI Plus
$4.99/mo
the cheapest step that raises its limits, with more Gemini access, increased feature limits and a bigger notebook. Introductory offers were showing: $1.29/month for 3 months, or $44.99 for the first year
Google AI Pro
$19.99/mo
expanded Gemini access for complex research, expanded feature limits and a large notebook size. Introductory offers were showing: $4.99/month for 3 months, or $179.99 for the first year
Google AI Ultra
$99.99/mo
the highest Gemini access and the largest source limits, for working across several big notebooks
By Google DeepMindLondon, United Kingdom6 products across 6 categories
Built for this. Sits inside Gmail, Docs and Drive, so it already has your context. Very large context windows and a generous free tier.
Free plan
Yes
Free tier with generous limits
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: Which underlying model you get varies by tier, and quality varies with it. Plus and Pro were both showing introductory offers when checked — a fraction of the price for the first three months, or a discount on the first year — so the number on the page is not the standing price, and the rows here quote the standing one.
By HumataAustin, United States1 product across 1 category
Strong fit. Ask questions across a set of uploaded documents and get answers with the page they came from, which suits a folder of papers rather than one.
Free plan
Yes
Free, capped at 60 pages of use in total rather than per month, with the basic features and
Month to month
$9.99/mo
Expert
Billed yearly
—
No yearly price published
Watch out: Answers only from what you upload, so the quality of the shortlist is the quality of the answer. The free tier is 60 pages in total, and the step from Expert to Team switches from a flat rate to per user.
All plans (4)
Plan
Price
What you get
Free
$0
Free, capped at 60 pages of use in total rather than per month, with the basic features and GPT-5 support
Expert
$9.99/mo
Team
$49/mo
Enterprise
Custom
personalised service and enterprise security for large teams
By ProtonLabs TechnologyBirmingham, United Kingdom1 product across 1 category
Strong fit. Straightforward document chat with citation back to the page, and it handles long PDFs without the usual truncation.
Free plan
Yes
Free, but tightly capped: 1 document a day, 100 pages per document and a 15MB upload limit
Month to month
$14.99/mo
Premium
Billed yearly
$11.99/mo
Premium plan −20%
Watch out: A thin layer over a general model, so it inherits that model’s habits. Little here that a general assistant with file upload does not also do.
All plans (4)
Plan
Price
What you get
Free
$0
Free, but tightly capped: 1 document a day, 100 pages per document and a 15MB upload limit
Premium
$14.99/mo · $11.99/mo yearly
50 documents a day, 2,500 pages per document and a 31MB upload limit
Pro
$19.99/mo · $14.99/mo yearly
150 documents a day, 6,000 pages per document and an 877MB upload limit
Enterprise
Custom
1,000 documents a day, unlimited pages per document and a 1,431MB upload limit
By PetalCambridge, United States1 product across 1 category
Strong fit. A document library with AI built in rather than a chat window you paste into, so your sources stay organised between sessions.
Free plan
Yes
Free, with 1GB of cloud storage, one seat and three guests. Support is included rather than
Month to month
$4.25/mo
Plus
Billed yearly
$2.55/mo
Plus plan −40%
Watch out: You have to commit to keeping documents in it for the value to appear. The individual tiers are separated by storage rather than by features, and the two cheapest are priced for .edu addresses — without one they cost around two thirds more.
All plans (7)
Plan
Price
What you get
Free
$0
Free, with 1GB of cloud storage, one seat and three guests. Support is included rather than priority
Plus
$4.25/mo · $2.55/mo yearly
$2.99 and $4.99 respectively month to month. 2GB of storage
Advanced
$8.49/mo yearly
$9.99 and $13.99 month to month. 10GB of storage and priority support
By DocusignSan Francisco, United States1 product across 1 category
Can do it. The signature tool most counterparties already accept, with AI that reads an agreement and pulls out the obligations and dates.
Free plan
No
No usable free tier
Month to month
$11/mo
Personal
Billed yearly
$10/mo
$120 a year, Personal plan −9%
Watch out: The free tier is three documents for the life of the account, which is a demo rather than a plan. The AI is not on these eSignature plans at all: it sits on the separate IAM line, sold as unlimited envelopes plus AI.
All plans (5)
Plan
Price
What you get
Free
$0
A free tier exists but is capped at three documents for the life of the account
Personal
$11/mo · $10/mo yearly
5 envelopes a month, for one person
Standard
$30/mo · $25/mo yearly
100 envelopes per user per year, shared templates and real-time collaboration
Business Pro
$45/mo · $40/mo yearly
100 envelopes per user per year, plus mobile-friendly web forms and payment collection during signing
Enhanced plans
Custom
the AI sits on a separate IAM tab sold as unlimited envelopes plus AI, priced on its own page
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 document review?
There is no single answer, which is why this page lists 8 rather than one: Claude, Gemini Notebook, ChatGPT, Gemini, Humata, AskYourPDF, Petal, Docusign. 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?
7 of the 8: Claude, Gemini Notebook, ChatGPT, Gemini, Humata, AskYourPDF, Petal. 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.
