SubChat
Ask about one line, without losing your place.
Highlight text on any page and open a focused AI side-chat right where you're reading. Use your Claude login—or connect OpenAI, Anthropic, or Gemini—then add files, search the web, and choose the model for each question.
No account. No servers. No tracking.
Highlight → Ask → a streamed answer. On Claude, GitHub, docs — anywhere.
Watch SubChat in action.
Three seconds from doubt to answer.
Highlight
Select any text on any page — an Ask chip appears right next to it.
Ask
Type your side-question. It's seeded with your selection — and as much context as you choose.
Answer
The reply streams in place. Your main chat never scrolls, never forks.
Built for the way you actually read AI answers.
Long replies breed side-questions. Give each one a focused thread with the exact context, model, files, and live web access it needs—while your main conversation stays clean.
Context modes Pro
Pick how much of the main conversation rides along with your question. SubChat builds the seed for you — the answer knows what you know.
Many subchats at once Pro
A thread per doubt. Drag, resize, minimize — each is its own conversation.
History that stays local Pro
Searchable, exportable as Markdown, never uploaded anywhere.
Keep & Continue in Claude Pro
Pin a subchat and it lives on in your own claude.ai history — or promote it to a full conversation.
Feels native
Streams in place with markdown, code copy, retry, shortcuts, and both themes.
Every page on the web Pro
GitHub, docs, papers, mail — highlight anything, anywhere, and ask your Claude about it.
Web search when you need it Pro
Turn on live web search inside a subchat. Get current answers without leaving the page or breaking your main conversation.
Files in the conversation Pro
Attach text, code, PDF, or DOCX files directly. Supported documents can also become encrypted reusable context in your local Mind.
Choose the right model Pro
Set a default in the dashboard or switch model per subchat—without giving up the compact floating workflow.
Web Mind Optional
Build a reviewable, encrypted persona from what you save, the documents you add, and the signals you explicitly enable. Relevant context follows you into new chats and forms.
Your chats never meet our servers. We don't have any.
Every AI sidebar you've tried proxies your text through their backend to meter credits. SubChat can't read your conversations — nothing leaves your browser except the request to the AI you're already using.
- Your own session, never a middlemanRequests ride the logged-in session you already have — like the site's own frontend.
- No analytics, no trackingNot even anonymous pings. Nothing to opt out of, because nothing is collected.
- Context lives on your machineSaved chats and optional Web Mind records stay local; Mind records are encrypted and deletable anytime.
Everyone else resells tokens. You already have Claude.
AI sidebars charge monthly because they pay for every reply you generate. SubChat doesn't — your Claude plan does the talking.
| SubChat | Sider | Monica | Merlin | |
|---|---|---|---|---|
| Monthly price | Free · Pro $3.99/mo | $12–25/mo | $8–20/mo | $19+/mo |
| Uses your Claude subscription | Yes | No — their credits | No — their credits | No — their credits |
| Unmetered replies | Your plan's limits | Daily credits | Daily credits | Daily credits |
| Account required | None | Sign-up | Sign-up | Sign-up |
| Your text routed through | Nobody — your browser | Their servers | Their servers | Their servers |
| Side-chat right at your selection | Right at your selection | Sidebar panel | Sidebar panel | Sidebar panel |
Competitor figures are paid monthly plans from public pricing pages (July 2026); annual billing is cheaper. Plans change often — check current rates. Names belong to their owners.
People got it immediately.
Unedited, from the LinkedIn launch post.
"This is actually super cool and helpful — I often find myself having to open other chats so I don't drift off from my main topic. Great job 👏"
"Such a simple idea but I genuinely lose my train of thought every time I have to scroll back up mid-conversation. Installed it already."
"This feels more contextual… it makes me wonder why Claude doesn't handle this natively. The onus shouldn't be on users to hack around long chats."
"I was wondering if there was any tool like this — losing track of the main thing in the chat is a huge problem for me. It should really be a feature Anthropic adds."
"Asking too many follow-up questions makes the chat messier and increases the likelihood of context drift — this is a great tool to solve that. 👍"
"Super helpful for when Claude brings up something I'm curious about but I don't want to sidetrack the main objective."
One coffee a month. Not one more AI subscription.
SubChat has no token bill to pass on to you — so it doesn't. Pro is priced like the utility it is.
Free
- Highlight → Ask on claude.ai
- 10 subchats a day, one at a time
- Selection context
- Streams, markdown, code copy, themes
Pro
- Everything in Free, unlimited
- Context modes — nearby turns & whole chat
- Unlimited simultaneous subchats
- Searchable local history + Markdown export
- Keep & Continue in Claude
- Web mode — ask on any website
- Web search, file attachments & per-chat models
Lifetime
- Everything in Pro, permanently
- All future Pro features included
- Early-supporter pricing, grandfathered
Every plan is a license key — no account, ever.
The questions everyone asks.
Something else on your mind? Everything runs in your own browser on your own session — there's no server, and nothing to sign up for.