Sustainable AI

Tools for using AI
more intentionally

Four browser-based tools. No account. No data sent anywhere. Each one teaches a method while doing the job — and connects to the others.

88% water saved by routing to Haiku
90% prefix tokens saved with caching
50% AI cost saved with the Batch API

Where these numbers come from →

Suggested starting path
See your footprint
→
Route your tasks
→
Audit your prompts
→
Measure what matters
Start here · Footprint 6 sliders · offline

Tech Water Footprint

Every stream, game, and AI query runs on data centres cooled with real water. Adjust six sliders to see your daily hidden footprint, annual perspective, and a personalised 3-step action plan.

See my footprint → Highest impact · Routing 88% water saved · offline

Model Router

Five task types, three factors, one recommendation. Find out which model tier your task actually needs — and see exactly how much water and cost you save vs defaulting to the strongest model.

Route my task → Everyday use · Prompts 5 dimensions · auto-rewrite

Prompt Efficiency

Paste any prompt, get a real-time efficiency score across five sustainability dimensions. Issues ranked high to low, with fixes — plus a suggested revision you can copy and use immediately.

Check my prompt → Foundation · Measurement 4 tasks · signal test

Eval Bench

Define what "good" means for an AI task, score two prompt versions against a rubric, and find out whether the delta is a real signal or just noise. Works offline with four built-in task types.

Run the bench →

The idea behind the toolkit

Each tool teaches a method, not just a number. The conviction underneath all of it: once you can see what a thing costs, you can make it cheaper without sacrificing the quality that matters.

Offline firstNo data leaves your browser. Every score and recommendation is computed locally.
Honest uncertaintyEstimates carry a 5–10× range. The relative comparisons matter more than absolute numbers. Methodology →
ActionableEvery tool ends with something to do, not just something to know.
ConnectedEach tool links to the others — they're designed to be used together.

Self-audit: these pages weigh 94–233 KB with fonts and score ≈0.01–0.04 g CO₂e per first view (co2.js v0.19, Sustainable Web Design v4, measured transfer sizes at launch) — a site about resource footprints should be able to show its own. Method →