A thoughtful introduction
to Korean traditions.
Sajufolio introduces saju through cultural context, a calculated four-pillar chart and reflective explanations. We are building a multilingual way to explore these traditions without presenting them as certainty about a person’s future.
- Company / 서비스명
- Sajufolio · 사주폴리오
- Company enquiries
- hello@sajufolio.com
- Established
- December 2025
- Based in
- South Korea
- Founder & CEO
- YongSik Yun
- Team
- Dedicated development team
- Funding
- Bootstrapped · no external investment
- Product stage
- Working beta · no payments
Your own cultural folio
The working beta calculates a four-pillar chart from the entered civil birth date and time, provides introductory explanations and offers Korean and English interfaces.
- Deterministic chart calculation, separate from AI explanation.
- Visible element counts and explanations of their limits.
- Themes for personal reflection, including yearly and relationship questions.
- A personal question for each theme, with a separate choice to include it in an AI request.
- Theme-specific understanding and usefulness ratings, reflection notes, a next action and a revisit date, saved with the folio on the device.
- Browser-local folios, full report exports and a separate consultation-preparation export.
- Consultation-interest forms with a preview of the selected language, theme, question and notes; practitioner-interest forms remain available.
When birth time is unknown, the hour pillar is omitted. A themed explanation is not a verified prediction or a compatibility calculation.
People, context and trust
We plan to explore remote cultural consultations that can connect people across languages and borders, along with appropriate practitioner identity and lineage checks.
No practitioner has been represented as verified by the platform. The beta does not provide live practitioner bookings, authenticated lineage networks, completed-consultation reviews or payments.
Saju and Korean shamanic traditions are distinct practices. Sajufolio respects that distinction rather than treating the two as interchangeable.
Calculation first. Interpretation second.
- The browser calculates chart symbols using a deterministic calendar library.
- The user chooses a theme and language, writes a question and can return to a saved reflection.
- If AI is available and the user separately consents, the computed chart, theme and language are sent to the displayed provider. A question is included only through its own checkbox. Name and birth date fields are excluded, but personal information manually typed into a question is not automatically removed.
- AI provides cultural explanation and reflective questions. It must not present illness, lifespan, marriage or financial outcomes as established facts.
AI integration status: The live beta uses Cloudflare Workers AI. Live availability is shown in the interface. The Claude integration is implemented and awaiting live validation. Explanations identify the provider actually used.
We plan to explore multilingual explanation and AI-assisted consultation drafts for practitioners, with human review and a clearer source and evaluation process. The next stage includes source review and evaluation with practitioners before expanding the scope of interpretation.
Our company and team
Sajufolio was founded in December 2025 in South Korea. Founder & CEO YongSik Yun leads a dedicated development team building the bootstrapped cultural platform. Sajufolio operates as a separate company. The company name, founding month and team description are supplied by the founder.
Calculation limits
The beta uses lunar-javascript solar-term calculations with sect 2. Time-zone conversion, daylight-saving correction, true-solar-time correction, lunar-date input, major fortune cycles and detailed compatibility are not currently supported.
Overseas births and solar-term boundaries need separate verification. The results have not been independently validated by a practitioner and should be treated as an introductory cultural tool.
Data and interpretation principles
Chart calculation runs in the browser. Saved folios, theme-specific questions, ratings and reflection notes are optional and local to the browser; users can delete them. A preparation preview shows exactly which selected context will accompany a consultation-interest registration; chart symbols and birth fields are excluded. AI explanation is a separate, consent-based transmission of the calculated chart and selected context.
Consultation and practitioner expressions of interest are sent to the service. Product measurement is separately opt-in and excludes names, emails, birth details, questions and reflection notes. Demo and QA activity is excluded from reported product results. Contact and feedback data are retained for a maximum of 180 days; deletion can be requested by email.
This is a cultural and reflective experience. It should not be used as medical, legal or financial advice, or as evidence for consequential decisions about another person.
Working features, opt-in usage and verification records
Our public progress page brings together the features available in this beta, the product questions we are testing, and the functional checks we have completed. It also shows recent aggregate activity from visitors who choose to participate in product measurement.
Sample and internal QA activity are excluded from those product measurements. The page explains the counting method, current limitations and next experiments so readers can assess the evidence directly.
Let’s build something useful.
Company and collaboration enquiries: hello@sajufolio.com.
Product support and data requests: admin@sajufolio.com.