The latest articles on DEV Community by Junhua Tan (@juliantanx). https://dev.to/juliantanx https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3953607%2Ff7b706ec-6638-405c-9ed3-e1898d08e7ab.png https://dev.to/juliantanx en Junhua Tan Tue, 09 Jun 2026 16:00:00 +0000 https://dev.to/juliantanx/i-built-an-open-source-tool-to-track-ai-coding-costs-across-claude-code-codex-cursor-4d7j https://dev.to/juliantanx/i-built-an-open-source-tool-to-track-ai-coding-costs-across-claude-code-codex-cursor-4d7j <h2> The Problem </h2> <p>I was using Claude Code, Codex, and Cursor daily but had no idea how much I was spending on tokens. Bills kept surprising me.</p> <h2> The Solution </h2> <p>I built <a href="https://aiusage.jtanx.com" rel="noopener noreferrer">AIUsage</a> — a local-first, open-source CLI that tracks everything.</p> <h2> Key Features </h2> <ul> <li>Token usage tracking with daily breakdowns</li> <li>Cost estimation with configurable pricing</li> <li>Model usage ranking</li> <li>Multi-device sync via GitHub or S3</li> <li>Desktop widget</li> </ul> <h2> How It Works </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> bash npm install -g @juliantanx/aiusage aiusage parse aiusage serve Why Local-First? Your data never leaves your machine. No accounts, no API keys, no cloud servers. Try It [aiusage.jtanx.com](https://aiusage.jtanx.com) </code></pre> </div> ai opensource productivity cli