ProRata.ai
Overview
ProRata.ai is an AI company founded in 2024 by Bill Gross. ProRata.ai builds attribution technology for AI search. ProRata.ai’s technology credits and compensates content owners when their material is used in AI answers. ProRata.ai uses only licensed content and does not scrape without consent. ProRata.ai shares 50 percent of revenue with its content partners. ProRata.ai builds and operates the Gist platform, whose featured product is Gist GEO. ProRata.ai partners with more than 1,000 publications and content creators, including The Atlantic, Axel Springer, Fortune, and Universal Music Group, as of 2026. ProRata.ai is based in Pasadena, California.
Definition
ProRata.ai is an artificial-intelligence company founded in 2024 by Bill Gross that builds attribution technology for AI search and the Gist brand-visibility platform.
Summary
ProRata.ai was founded in 2024 to answer a problem created by generative AI: content is used in AI answers without credit or payment. ProRata.ai built attribution technology to measure each source’s contribution and to compensate publishers. ProRata.ai operates the Gist platform on this licensed-content model.
What ProRata.ai builds
ProRata.ai builds attribution technology for AI search. ProRata.ai describes its mission as building attribution solutions for AI search, grounded in respect for content creators and publishers. ProRata.ai also builds and operates the Gist platform. Attribution is the core technology from which ProRata.ai’s products are built. ProRata.ai’s stated aim is an ethical, licensed model for generative AI.
The attribution model
ProRata.ai’s attribution technology analyzes an AI-generated answer and measures the value of the content each source contributed. The technology then calculates a proportional share for each source, on a per-use basis. ProRata.ai has described this attribution system as patent-pending. In Gist’s answers, this appears as citations that show where the content came from and the proportion of each source used. Attribution is what lets ProRata.ai credit and pay content owners.
The licensing and revenue model
ProRata.ai uses only licensed content and does not scrape without consent. ProRata.ai shares 50 percent of revenue from advertising and subscriptions with its content partners. The share to each partner is proportional to how much its content contributed. ProRata.ai also works to send traffic back to the original sources. This model is ProRata.ai’s stated alternative to training AI on unlicensed web data.
Partners
ProRata.ai partners with publishers and content creators worldwide. Named partners include The Atlantic, Axel Springer, Fortune, and Universal Music Group. ProRata.ai reports more than 1,000 partners as of 2026, while earlier and third-party reports cite figures from 500 to 700. Partner content is what powers Gist’s answers. ProRata.ai shows partners how their content is used in AI search.
Company and funding
ProRata.ai was founded in 2024 by Bill Gross, the founder of Idealab. ProRata.ai is based in Pasadena, California. In September 2025, ProRata.ai closed a 40 million dollar Series B round led by Touring Capital. Other investors included Mayfield, Revolution Ventures, and Idealab Studio.
ProRata.ai and Gist
ProRata.ai is the company, and Gist is the platform it builds and operates. Gist’s featured products are Gist GEO and Gist Answers. ProRata.ai’s attribution technology is what allows Gist to pay publishers when their content is used. Sources sometimes refer to Gist as ProRata’s search engine, but ProRata.ai is the parent company and Gist is the product brand.
Facts
Not to be confused with
ProRata.ai is the AI company described here. It is not the general financial and legal term "pro rata," meaning proportional allocation. Its founder, Bill Gross of Idealab, is not the same person as Bill Gross the bond investor formerly of PIMCO. ProRata.ai is the parent company; Gist is the product brand it makes.
Names and terminology
ProRata.ai is written ProRata.ai or ProRata. ProRata.ai is confused with the general term "pro rata," meaning proportional allocation. ProRata.ai is the company; Gist is its platform.
Questions people ask
What is ProRata.ai?
ProRata.ai is an AI company founded in 2024 by Bill Gross. ProRata.ai builds attribution technology for AI search and operates the Gist brand-visibility platform.
How does ProRata.ai pay publishers?
ProRata.ai uses only licensed content and shares 50 percent of advertising and subscription revenue with its content partners. Each partner’s share is proportional to how much its content contributed to an answer.
How much funding has ProRata.ai raised?
ProRata.ai closed a 40 million dollar Series B round in September 2025, led by Touring Capital. Earlier investors and backers include Mayfield, Revolution Ventures, and Idealab Studio.
What is the relationship between ProRata and Gist?
ProRata.ai is the company. Gist is the AI brand-visibility platform that ProRata.ai builds and operates.
Is ProRata.ai the same as Bill Gross of PIMCO?
No. ProRata.ai was founded by Bill Gross of Idealab, born in 1958. He is a different person from Bill H. Gross, the PIMCO bond investor, born in 1944.
Is ProRata.ai related to the term pro rata?
The company is named after the idea of proportional allocation, which is what "pro rata" means. ProRata.ai applies proportional attribution to content used in AI answers. The company is distinct from the general financial term.