When you read a long AI answer and have a doubt about a specific line — you normally have to scroll back, lose your place, and ask again in a new message.
InlineDoubt fixes that.
Hover any line → a bubble appears → click it → type your doubt → AI explains that exact line right there, inline — like a Figma comment anchored to that sentence.
- Hover any line in an AI answer — a purple bubble appears
- Click the bubble — a small popup shows with the selected text
- Type your doubt in plain English
- AI explains that exact line right there — no new tab, no scrolling
| Feature | Description |
|---|---|
| 💬 Inline comment threads | Figma-style bubbles anchored to each line |
| 🔁 Follow-up questions | Ask multiple questions in the same thread |
| ✅ Mark as Resolved | Track what you've understood |
| ✏️ Add personal notes | Edit or annotate any AI answer |
| 📌 Pinned to exact line | Each bubble stays anchored where you asked |
| 💾 Saved per conversation | Doubts persist — come back anytime |
| 🗑️ Remove anytime | Delete individual doubts or clear all |
| 📋 Right sidebar panel | All saved doubts in one place, clickable |
| Platform | Session-based | API Key |
|---|---|---|
| ✅ Claude.ai | ✓ No key needed | — |
| ✅ ChatGPT | — | Free key (30 sec setup) |
| ✅ Perplexity | ✓ No key needed | — |
| ✅ Gemini | — | Free key (30 sec setup) |
| ✅ DeepSeek | — | Free key (30 sec setup) |
| ✅ Grok | — | Free key (30 sec setup) |
| ✅ Meta AI | — | Free key (30 sec setup) |
Claude.ai and Perplexity use your existing login session — no API key, never limited. All other platforms use a free API key (no card, no subscription, never expires).
1. Download or clone this repository
2. Open Chrome → go to chrome://extensions
3. Turn ON Developer mode (top right toggle)
4. Click "Load unpacked"
5. Select the inlinedoubt-extension folder
6. Done — go to Claude.ai and try it!
| Layer | Technology |
|---|---|
| Extension Shell | Chrome Manifest V3 |
| UI Injection | Content Script (JS + CSS) |
| Session Auth | chrome.cookies API |
| API Calls | Background Service Worker |
| Storage | chrome.storage.local |
| DOM Watching | MutationObserver |
| Positioning | CSS position: absolute |
User is on claude.ai → already logged in → session cookie in browser
↓
User hovers a line → clicks bubble → types doubt
↓
Extension background.js reads session cookie via chrome.cookies API
↓
Calls claude.ai internal API with that cookie
↓
Claude replies → shown inline next to the exact line
No wrapper around Claude or ChatGPT. No proxy server. No middleman. The extension uses the same session you already have open.
- ✅ No data sent to any third-party server
- ✅ No tracking, no analytics
- ✅ Doubts stored locally in your browser only (
chrome.storage.local) - ✅ Session cookies only used to call the AI platform you're already on
- ✅ Extension only activates on supported AI platforms
- PDF support inside browser
- Export all doubts as notes (Markdown / Notion)
- Keyboard shortcut to trigger bubble
- Dark/light theme toggle for sidebar
- Firefox support
Found a bug or have an idea? Open an issue — all feedback welcome.
Sathish Kumar — built as a portfolio project to solve a real problem.
If you use InlineDoubt and find it helpful, consider:
- ⭐ Starring this repo
- 🔗 Sharing the Chrome Web Store link
- 🐛 Reporting any bugs you find
Built it , because scrolling back to re-read is the worst.