Dongili Tools

Table of Contents

Overview
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Dongili Tools is a collection of free, interactive business calculators deployed as a single suite. Each calculator solves a specific ROI or cost analysis problem that businesses face — from evaluating AI API costs to projecting solar panel savings.

Tools in This Suite
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Tool	What It Does
AI Cost Optimizer	Compare AI API pricing across providers
Automation ROI	Evaluate workflow automation investments
Solar EV Calculator	Estimate solar + EV charging ROI
Tariff Calculator	Analyze trade tariff impact on products
Robot ROI	Assess robotics investment returns

Architecture
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Deployment: GitHub Pages (static, zero-cost hosting)
Frontend: Vanilla HTML/CSS/JS — no framework, instant load
Data: Embedded calculation models, no server required

How It Started
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This suite grew out of a simple question: what if every boring spreadsheet calculation could be a polished, shareable web tool? Each calculator was originally a one-off project, then consolidated into a unified suite with consistent design and shared components.

2026