Open Personality Lab

An open-source, privacy-first Big Five personality assessment app with continuous trait scores, facet-level insights, and a modern shareable web experience.

Live Demo

• Staging: https://staging.d21nljvsrjz16n.amplifyapp.com/

Overview

Open Personality Lab is a lightweight web app that explores a more modern alternative to rigid personality typing.

Instead of forcing users into hard labels, this project focuses on:

• Big Five as the core personality model
• Continuous scores instead of binary type buckets
• Facet-level insights for more detailed interpretation
• Privacy-first client-side scoring and progress saving

Screenshots

Desktop Results

Current MVP

The current MVP includes:

• 30-question assessment flow
• 5 major trait scores
• 15 facet-level summaries
• Real-time profile preview while answering
• Local progress saving in the browser
• Scenario-based interpretation blocks
• JSON report export
• Static deployment on AWS Amplify Hosting

Why This Project Exists

Many popular personality products still rely on fixed type categories. This project is an experiment in building a more explainable and product-friendly alternative for self-discovery, reflection, and discussion.

This is currently an MVP, not a clinically validated instrument.

Product Direction

Near-term goals:

• Improve UI clarity and completion flow
• Refine question wording and reduce ambiguity
• Expand the item bank for each facet
• Improve report writing and feedback quality
• Add structured pilot data collection

Long-term goals:

• Pilot testing with real users
• Internal consistency checks
• Better item calibration
• IRT-based scoring upgrades
• CAT-style adaptive testing

Tech Stack

• HTML
• CSS
• Vanilla JavaScript
• AWS Amplify Hosting

Local Development

Start the local preview server:

cd C:\Users\chend\OneDrive\Desktop\mbti_plus
node .\server.js

Then open:

• http://127.0.0.1:4173

If port 4173 is already in use:

cd C:\Users\chend\OneDrive\Desktop\mbti_plus
set PORT=4174
node .\server.js

Suggested GitHub Metadata

Description:

An open-source, privacy-first Big Five personality assessment app with continuous trait scores, facet-level insights, and a modern shareable web experience.

Topics:

personality-test, big-five, big5, personality, psychology, quiz-app, self-discovery, webapp, javascript, html, css, frontend

Documentation

• Product foundation
• Assessment blueprint
• MVP roadmap
• Data model
• AWS deploy guide