Open Jung Type Inventory

Discoveryour inner self

Answer 48 Jungian preference questions in about 5–10 minutes. No account, name, or email is required, and your complete personality report opens immediately after completion.

  • No sign-up
  • 5–10 minutes
  • Complete report
  • Immediate result
Explore what makes you, you

The four personality dimensions

Your type grows from four basic preferences. Most people are not absolute endpoints: each dimension is a spectrum, and you may simply lean toward one side.

E / I

Energy direction

Extraversion vs introversion: do you direct energy toward people and activity, or ideas and reflection?

S / N

Information

Sensing vs intuition: do you focus on concrete facts and detail, or patterns and future possibilities?

T / F

Decisions

Thinking vs feeling: do you lean on logic and analysis, or values and the effects on people?

J / P

Lifestyle

Judging vs perceiving: do you prefer structure and certainty, or flexibility and open options?

16 Types, 4 Temperaments

Keirsey's temperament theory groups 16 MBTI types into four distinct families, each with unique thinking and behavior patterns

NT

Purple · Rationals (NT)

INTJ · INTP · ENTJ · ENTP

Often drawn to logic, systems, and long-term possibilities, they may enjoy analyzing complex problems and comparing solutions. Experience, ability, and context still shape how these preferences appear.

NF

Green · Idealists (NF)

INFJ · INFP · ENFJ · ENFP

Value empathy and collective good, cooperative and imaginative. Compassionate helpers who pursue meaningful goals and spiritual significance. Often play the role of mediator in social circles.

SJ

Blue · Guardians (SJ)

ISTJ · ISFJ · ESTJ · ESFJ

Responsible, careful, and down-to-earth. They value tradition and order, are organized and disciplined, and are reliable executors in any team. Good memory, dislike change, and tend to worry about things going wrong.

SP

Yellow · Artisans (SP)

ISTP · ISFP · ESTP · ESFP

Live in the moment with keen observation and sensitivity to environmental changes. Optimistic and cheerful with high risk tolerance, they are pragmatic improvisers who learn through sensory experience and practice.

Popular personality types

Begin with the most explored types, then browse all 16. Every guide includes relationships, love, careers, and growth.

Topics You Care About

Explore career, relationships, personal growth, teamwork, parenting, and study through a preference-based lens.

How it works

How the test works

OSJJ uses 48 self-report preference questions to show relative tendencies across four dimensions. No account, name, email, or phone number is required. Progress and the latest result stay in this browser. The result reflects this set of answers and is not a clinical diagnosis or ability assessment.

Start the free test
  1. 01
    Answer 48 questions

    Use a clear paired-choice scale to reflect your everyday preferences.

  2. 02
    Get your type

    See which of the 16 personality patterns fits you best.

  3. 03
    Explore your report

    Read detailed guidance on strengths, relationships, careers, and growth.

  4. 04
    Save or share

    Download your personality card or share it with friends.

Common questions

What you should know before using a personality type result

Yes. The OSJJ 48-question assessment is free and requires no account or sign-in. You can view your four-letter type and full report immediately after finishing. The 200-question professional assessment is optional for people who want to examine close preferences in more detail.

About the project

About OSJJ

OSJJ stands for Open Source Jung Journey. It is a free project for self-exploration and observing personality preferences, designed to keep the test lightweight and the explanations clear.

The project follows an open Jungian type-inventory approach and supports bilingual testing, full reports, and MCP integration. Transparency is part of the method, alongside honest limits on what a type result can claim.

  • Free, no sign-up
  • No identity collection
  • Explainable results
  • Open integrations

AI agent integration

MCP server integration

Use the Model Context Protocol (MCP) to let Claude and other compatible assistants run personality tests programmatically over Streamable HTTP.

OSJJ MCP endpointhttps://osjj.cn/mcp

Supports Claude Desktop, Claude Code, and compatible MCP clients

Ready to begin?

Take the free personality test and get to know your preferences more clearly.

Start the free test