Okina is a specialized AI chat for tax and accounting practice. Enter a real-world question, and it generates answers grounded in public primary sources — National Tax Agency Tax Answers, e-Gov legal database, and professional reference books — while highlighting the exact source pages behind each answer. Developed by Kaguya Inc., the free beta launched on August 17, 2026.
Key Features
- Source citation: Alongside each answer, Okina shows the underlying sources — statutes, National Tax Agency Tax Answers, and professional reference books
- Original-text highlighting: Highlights the 1-2 pages that back each answer, cutting down the work of cross-checking with separate tools
- Practical workflow support: Useful as a starting point for drafting client-facing explanation materials or for internal discussion
Pricing
As of August 17, 2026, only a free beta is available, letting you try tax consultation backed by professional references and public documents, complete with source citation and original-text highlighting, at no cost. A paid tier is planned for the official release, with an intent to build in a revenue-share model for publishers — but pricing and plan details remain unannounced as of August 2026. Check the official site for the latest information.
Pros & Cons
✅ Pros
- Source citation and original-text highlighting cut down the effort of verifying an answer’s grounding
- Lets you cross-check across statutes, public documents, and professional reference books in one place
- Free beta, so it’s easy to try out
⚠️ Cons
- Pricing structure and feature expansion for the official release are still unannounced
- The professional reference books covered by search are currently limited (expansion planned for the official release)
- As a newly launched service, there’s not yet much information on track record or user case studies
Comparison with Similar Services
| Comparison | Okina | PwC Japan Tax AI Assistant | Tax Guidance Assistant (PwC Japan × Daiichi Hoki) |
|---|---|---|---|
| Provider | Kaguya Inc. | PwC Japan (major tax accounting firm) | PwC Japan × Daiichi Hoki |
| Distinctive feature | Grounds answers in public documents and professional reference books, with original-text highlighting | Tax research and document-drafting support, built around an in-house knowledge base | A tax chatbot built on Daiichi Hoki’s statutes and case-law database |
Compared to general-purpose conversational AI like ChatGPT, Claude, or Perplexity, Okina stands out for its tax-specialized grounding in primary sources and original-text highlighting.
Who It’s For
- Tax accountants who want to verify primary sources while consulting with clients
- Corporate accounting/tax staff looking to streamline internal inquiry handling
- Anyone who needs to quickly draft client-facing explanation materials
Summary
Okina is a tax and accounting AI chat that generates answers grounded in statutes, National Tax Agency public documents, and professional reference books, highlighting the exact source pages behind each answer. Its strength lies in reducing the effort of verifying an answer’s grounding — though it’s worth noting this is a free beta launched on August 17, 2026, with pricing and feature expansion for the official release still unannounced.