Inkdex ✺

Track your ChatGPT & Claude usage locally, then print a beautiful shareable "Wrapped" card.

ChatGPTとClaudeの利用量をブラウザ内で計測し、リソグラフ風の利用量カードを生成するChrome拡張。送信ゼロ。 No account. No servers. Nothing leaves your browser.

A monochrome, risograph-editorial Chrome extension (Manifest V3). It counts your messages on claude.ai and chatgpt.com, estimates tokens & cost client-side, shows a tiny live overlay, and one-click generates a print-style usage card you can download or copy.

Estimates, not billing. Token & cost figures are client-side approximations (browsers expose no billing API). They are labeled as estimates everywhere.

Install (load unpacked — dev)

1. chrome://extensions → toggle Developer mode (top right).
2. Load unpacked → select the extension/ folder.
3. Open claude.ai or chatgpt.com, chat as usual. A small ✺ pill shows today's count.
4. Click the toolbar icon → see stats → PRINT WRAPPED CARD → Download / Copy.

What it stores

Everything lives in chrome.storage.local under one key (inkdex:days), as per-day buckets: { "YYYY-MM-DD": { claude:{msgs,in,out}, chatgpt:{msgs,in,out} } }. There is no network code in this extension (verified: zero fetch/XHR/sendBeacon).

Permissions (minimal)

• storage — save your counts locally.
• clipboardWrite — "Copy image" of the card (Download works without it).
• host access to claude.ai, chatgpt.com, chat.openai.com only — to read message text for counting.

Layout

extension/
  manifest.json
  popup.html / popup.css / popup.js     ← stats + card generator
  src/estimate.js                       ← token/cost estimation (heuristic)
  src/storage.js                        ← local day-bucket storage
  src/track.js                          ← content script: count + overlay pill
  src/card.js                           ← canvas Wrapped-card renderer
  fonts/  (Space Grotesk, JetBrains Mono — OFL)
  icons/  (16/48/128)
_docs/  ← requirements, distribution plan, design proofs

Known limitation (honest)

Claude's assistant-message DOM uses regenerated class names; assistant counting on claude.ai is best-effort (specific selectors, then a selector-independent fallback) and may need a tweak when their DOM shifts. ChatGPT uses the stable data-message-author-role attribute and is solid. User counting on Claude uses the send action, so it degrades gracefully.

License

Code: MIT. Fonts: SIL Open Font License (Space Grotesk, JetBrains Mono).

---

Built by greymoth

19, Tokyo. I build small, honest dev tools in the open and file Japan-localization fixes into real OSS — and I publish what died, too.

Everything in one place → the hub · Live proof — merged PRs + App Store, pulled from the GitHub API →

⭐ Follow on GitHub — every new tool ships as a public repo first, so a follow is a launch notification (no email, no algorithm).