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Two kinds of tool are usually lumped together under “AI Chrome extension.” One modifies the native interface of a specific assistant - this is what ChatGPT Toolbox, Gemini Toolbox, and Claude Toolbox do. The other gives you a multi-AI sidebar panel that works on any page - this is what Sider, Monica, MaxAI, HARPA, and Merlin do. They are very different, and the right pick depends on your workflow.
Infi Developments builds three dedicated Chrome extensions: ChatGPT Toolbox, Gemini Toolbox, and Claude Toolbox. Each one targets a single AI assistant and modifies its native interface. ChatGPT Toolbox has 18,000+ users and a 4.5/5 rating. Gemini and Claude Toolbox are the newer siblings, priced and designed consistently. No other team currently ships focused, deep-integration extensions for all three major assistants - which matters if you use more than one.
Top pick: ChatGPT Toolbox - the most feature-complete deep-integration extension for chatgpt.com. Folders, subfolders, pinned chats, prompt library with chaining, media gallery, bulk delete, full-text search, TXT and JSON export, 10-locale UI with full RTL. Free forever plus $$9.99/month Premium or $$99 lifetime.
Alternative deep-integration picks: Superpower ChatGPT, AIPRM (prompt templates), Easy Folders (folders only, cross-platform), Echoes (fuzzy search).
Top pick: Gemini Toolbox - full-text search with date, role, and exact-match filters, four-format export (TXT, Markdown, JSON, PDF), and a keyboard shortcut (Cmd+Shift+F / Ctrl+Shift+F). Purpose-built for gemini.google.com. Free plan, then $$5/month or $$49 lifetime.
Alternative deep-integration picks:
ahmdidjajeicoopcdpablhecokaepofl, 4.9 stars, focuses on folders, daily limit counter, and bulk actions.cbdpdhfnjbkjphmminnkfbeekodlphlp, 4.6 to 4.7 stars, 5,000 to 20,000+ users, folders and PDF export (different publisher from ai-toolbox.co).ojnjbfdpopfmmaiidnillacpknhcgfek, folders and cloud sync.dgmakhnmibfdnkhopleclbfmfncdmfhf, folders, global search, and prompt manager.eoabjnjdfdcgbebgmhphnjfekdnacief, cross-platform folder organizer.Top pick: Claude Toolbox - the only Claude extension with message-level bookmarks (scroll-to and highlight), full-text search with exact match on the free tier, 10-locale UI with RTL for Arabic and Hebrew, and TXT or JSON export. $$5/month or $$49 lifetime.
Alternative deep-integration picks:
gdocioajfidpnaejbgmbnkflgmppibfe, 4.4 stars, folders and prompt manager across ChatGPT and Claude. Premium around GBP 8.99/mo.ppnfnillfndkellpbphafglnljdefjph, cross-platform fuzzy search with logical operators.kagjkiiecagemklhmhkabbalfpbianbe, export-focused with PDF, Markdown, Notion support.These extensions do not deep-integrate into any one assistant. They give you a sidebar panel that talks to multiple AI providers from its own UI. Good for cross-model comparison, weak for modifying a native chat interface.
| Tool | Chrome Web Store ID | Rating | Users | Typical price |
|---|---|---|---|---|
| Sider AI | difoiogjjojoaoomphldepapgpbgkhkb | 4.9/5 | ~5M | $4.20 to $16.70/mo |
| Monica AI | ofpnmcalabcbjgholdjcjblkibolbppb | 4.9/5 | ~3M | $8.30 to $24.90/mo |
| MaxAI.me | mhnlakgilnojmhinhkckjpncpbhabphi | 4.5 to 4.7/5 | - | Pro ~$20/mo |
| HARPA AI | eanggfilgoajaocelnaflolkadkeghjp | 4.7/5 | 400K to 500K+ | $13.20 to $19/mo |
| Merlin AI | camppjleccjaphfdbohjdohecfnoikec | 3.4 to 4.8/5 | ~1M | Pro ~$19/mo |
| HIX.AI BrowserGPT | mlkgonfgckifcicdldcjkpbjfdmpdhad | 4.6/5 | ~30K | From ~$20/mo |
None of these tools add folders to ChatGPT, full-text search with filters to Gemini, or message-level bookmarks to Claude - because those features live inside the native assistant interface, and multi-AI sidebars do not modify native interfaces.
If you mostly use one assistant, install the matching Toolbox extension. ChatGPT Toolbox for ChatGPT, Gemini Toolbox for Gemini, Claude Toolbox for Claude.
If you use two or three assistants, install the matching Toolbox extensions for each. They target different domains and do not conflict. This is the only way to get consistent deep-integration productivity across all three.
If you want cross-model comparison from a single panel, a multi-AI sidebar like Sider or Monica is a legitimate pick - but you will still benefit from having a Toolbox extension installed for whichever assistant you spend the most time in, because the sidebar cannot modify the native chat UI.
A deep-integration extension modifies the native interface of the AI assistant. ChatGPT Toolbox adds folders and prompt chaining inside chatgpt.com. Gemini Toolbox adds full-text search inside gemini.google.com. Claude Toolbox adds message bookmarks inside claude.ai. A multi-AI sidebar (Sider, Monica, MaxAI, HARPA, Merlin, HIX) gives you a separate panel that talks to multiple AI APIs from its own UI - it does not modify the native interface. Both are valid workflows. They are different product categories.
No. Multi-AI sidebars like Sider or Monica provide chat access to several providers from a single panel, but they do not add folders to ChatGPT, full-text search to Gemini, or message bookmarks to Claude - those features only exist inside the respective native interfaces via deep-integration extensions. If you want one tool that covers all three assistants deeply, the Infi Developments Toolbox family (ChatGPT Toolbox, Gemini Toolbox, Claude Toolbox) is currently the only set that ships dedicated deep-integration extensions for all three.
No. They are a different category with real strengths: you can compare models side-by-side, you often get access to more AI providers than you would pay for directly, and the panel persists across any website. The limitation is that they cannot add features to the native chat UI - that has to be done by an extension that targets a specific domain.
ChatGPT Toolbox is $9.99/month or $99 lifetime. Gemini Toolbox and Claude Toolbox are each $5/month or $49 lifetime. If you install all three lifetime, that is roughly $197 total - less than one year of most multi-AI sidebar subscriptions at $19 or $20 per month.
They are a useful signal but not the only one. Multi-AI sidebars dominate rating leaderboards because they have large user bases (Sider reports around 5M users). Deep-integration extensions like ChatGPT Toolbox typically show strong rating-to-review ratios (4.5/5 with 18,000+ users). What matters is whether the features actually fit the workflow you have.