Anyone with a Google account can upload a PDF and get two reviews a week at no cost. Google built it first for research papers, and the public version also reads contracts and financial statements.
The expensive error in a long document is rarely inside one clause. It lies between two: page 4 fixes a price for a year, and a schedule on page 52 lets it rise every quarter. Anyone who reads from front to back, a person or a chatbot, has to remember page 4 when page 52 arrives. Deep Review splits the document into sections and gives each one to its own AI agent, which can look up any other part of the document while it works. On maths and computer science papers, this design found nearly nine in ten known errors, more than Gemini 3.1 Pro found on its own.
For example, a buyer at a retailer gets a 60-page supply agreement back from a supplier. About 20 minutes after uploading it, she has comments attached to the exact lines, such as a notice period of 30 days in one clause and 90 in another. A careful second read would take a senior person half a day. Checking the list takes her an hour, and what to push back on is still her decision.
That second read used to be kept for contracts big enough to justify a lawyer's afternoon. At two free reviews a week, most of the smaller ones can have it too.