Specific by design
Ratio is an AI tool for tax and accounting professionals. It was designed and built specifically for that work, not adapted from a general-purpose assistant.
Company
Built for the work behind every tax decision.
Ratio is an intelligent AI system and assistant for tax and accounting professionals. It brings capable language models together with specialist tax knowledge and the context of your team's work.
Who builds Ratio
An AI tool for tax and accounting professionals. Built by them, for them.
Built by practitioners
It was developed by tax and accounting professionals from Big 4 practice, for tax and accounting professionals.
Built to work like you do
Ratio is built to think, research and produce outputs like a tax and accounting professional — reasoning from legislation and guidance, and showing the sources behind an answer.
Why Ratio
Better tools should make expertise more valuable, not less.
Tax work demands interpretation, evidence and professional judgement. Ratio is designed to reduce the friction around research and production while keeping practitioners in control of the final answer.
Its tools connect authoritative information with the documents, calculations, conversations and project knowledge that shape a real engagement.
Our approach
Specialist by design
Focused on the research, drafting and collaboration patterns of tax and accounting teams.
Evidence over assertion
Built to show the sources behind research answers so professionals can verify the work.
Humans stay in control
Drafts and edits remain reviewable. Ratio supports professional judgement rather than replacing it.