ChromaWild: A Local Gemma-Powered Color Walk

Description and use

ChromaWild is a local web app that generates outdoor color exploration quests using Gemma via Ollama, enabling users to find and compare colors in everyday public spaces and record observations.

Problem

Users want a simple way to generate outdoor color exploration prompts that reflect real walking environments without relying on paid inference APIs.

Outcome

ChromaWild enables users to generate context‑aware color exploration quests locally, avoiding external API costs and allowing experimentation with different models.

Workflow

• Install Ollama and pull the Gemma2:2b model with ollama pull gemma2:2b
• Run the app locally with npm run dev
• Request a new quest from the browser
• Next.js API route sends a prompt to local Ollama
• Ollama returns a JSON with title, color, subject, hint
• API validates the fields and hex value
• Browser displays the quest and allows color comparison, note taking, and sketching
• All data is stored in browser local storage

Evidence

The color and subject are generated together by Gemma through Ollama.

Source

To generate quests locally, install Ollama, run ollama pull gemma2:2b, then start the app with npm run dev.

Source

With Ollama, the default color-quest generation runs on the machine hosting the app.

Source