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.
- 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.
- Optional browser-local saved folios and exports.
- Consultation-interest and practitioner-interest forms.
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 an explanatory theme and language.
- If AI is available and the user separately consents, the computed chart, theme and language are sent to the displayed provider. Name and birth date are excluded from this AI request.
- 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 team and calculation limits
Sajufolio was founded in December 2025 in South Korea. Founder & CEO YongSik Yun leads a dedicated development team building the bootstrapped cultural platform.
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 are optional and local to the browser; users can delete them. 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. Aggregate event payloads exclude names, emails and birth details. 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.
Let’s build something useful.
Product questions, pilot interest or data requests are welcome.