About Blue J
Blue J began in 2015 when University of Toronto law professor Benjamin Alarie and co-founders set out to predict tax-case outcomes with machine learning. It has since become one of the most-funded AI tax research companies anywhere, raising a $122M USD Series D in August 2025 led by Oak HC/FT and Sapphire Ventures.
Its generative assistant, Ask Blue J, gives source-cited answers and outcome analysis across US, Canadian, and UK tax law. The company grew from about 200 client organizations in 2021 to more than 2,500 by 2025, with weekly active usage above 70%.
Ask Blue J answers tax research questions with cited sources and predictive outcome analysis across US, Canadian, and UK tax law.
Highlights
- Raised a $122M USD Series D in August 2025
- 2,500+ client organizations, up from ~200 in 2021
- Co-founded by U of T law professor Benjamin Alarie; partnered with IBFD for cross-border research
Third-party reviews
A small pool of reviewers rates ease of use and customer service highly, with value for money scored somewhat lower.
Read on CapterraRatings belong to the cited platforms and change over time — last checked August 2026. TaxAIs does not collect its own reviews; follow the links above for current scores and full review text.
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