KOIKUSE

KOIKUSE is a privacy-first relationship self-reflection app that turns 18 questions into practical, respectful next steps—without judging or claiming to know another person’s feelings.

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Inspiration

What it does

How we built it

Challenges we ran into

Accomplishments that we're proud of

What we learned

What's next for KOIKUSE

Inspiration

A slow reply, a change in tone, or a small misunderstanding can quickly create anxiety in a relationship.

Many relationship tools try to guess another person’s feelings or give manipulative advice. I wanted to create something different: a tool that helps users understand themselves, organize observable behavior, and take a respectful next step without claiming to know what someone else is thinking.

What it does

KOIKUSE is a privacy-first relationship self-reflection web app.

Users answer 18 questions that analyze six relationship dimensions:

  • Security
  • Intimacy
  • Expression
  • Autonomy
  • Spark
  • Reassurance

The app then presents one of four relationship tendencies, along with the user’s strengths, cautions, relationship balance, and three practical actions they can try immediately.

KOIKUSE also includes a separate 10-question check for organizing observable behavior from another person. These results are presented only as possibilities, never as facts about that person’s feelings.

Users can also search local advice for common situations involving crushes, messaging, dates, relationships, and breakups.

Results can be reopened, saved, and shared as readable image cards.

How I built it

KOIKUSE was designed and developed with HTML, CSS, and JavaScript.

I used OpenAI Codex with GPT-5.6 throughout the process, including:

  • Product and feature planning
  • Diagnosis structure and scoring logic
  • Responsive mobile UI development
  • Accessibility improvements
  • Debugging and code review
  • Testing and deployment preparation

The app does not send diagnosis answers or searches to a server. Processing happens locally in the browser, and only the latest diagnosis result is stored on the user’s device.

Challenges

The biggest challenge was turning emotional and relationship-related topics into useful guidance without making harmful assumptions.

I needed to ensure that the app did not claim to know another person’s feelings, encourage manipulation, or present results as psychological or medical diagnoses.

Another challenge was creating a complete mobile-friendly experience with diagnosis logic, advice search, result history, and shareable image cards using only front-end technologies.

Accomplishments

I am proud that KOIKUSE is a complete working product rather than only a prototype.

It combines self-reflection, practical actions, privacy-conscious design, and respectful relationship guidance in one simple mobile experience.

I am also proud that Codex supported the entire development process, from early product decisions to the final implementation and testing.

What I learned

I learned that AI coding tools are most effective when they are used not only to generate code, but also to examine product logic, user safety, accessibility, and edge cases.

Codex helped me repeatedly review and improve both the technical implementation and the experience presented to users.

What's next

Next, I plan to expand multilingual support, add more relationship situations, improve accessibility, and conduct user testing to make the advice clearer and more helpful.

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