Claude Incognito vs Private Claude

Anthropic's incognito mode looks private. Then you read the retention policy. Side-by-side data flows so you can see exactly where each one sends your chat.

What Claude Incognito actually does

Incognito is a real feature. It does real things. It also doesn't do several things people assume it does.

What it does

• No training. Even on Free, Pro, and Team plans where training is on by default, incognito chats are excluded.
• No visible history. The chat doesn't show up in your sidebar. Nobody glancing at your account sees it.
• No memory. The conversation doesn't pull from your past chats and doesn't write into Claude's memory of you.

What it doesn't do

• Anthropic still receives the message. They run the model. There's no way around that on any product they sell.
• Anthropic retains the chat for 30 days. This is published in their support docs. The retention exists for safety screening and abuse detection.
• The chat is subpoenable during that 30-day window. If a court orders production, anything currently held by Anthropic is producible.
• It isn't encrypted from Anthropic. Anthropic can read it. They have to, to generate a response and run their classifiers.

What Private Claude does

Private Claude takes a different shape. It uses the developer version of Claude (the same Claude businesses plug into their apps) and wraps a normal chat interface around it. The privacy properties come from the architecture, not from a setting you toggle.

• Bring your own Anthropic connection password (BYOK). You grab it from console.anthropic.com and paste it in. We never store it on our servers. It lives in your browser session.
• Browser-only chat. The conversation lives in your tab while it's open. Close the tab and it's gone. No database. No saved threads. No "your past conversations" tab.
• Anthropic API auto-deletes after 7 days. Anthropic's developer-version retention is 7 days for operational logs, then gone. Not 30. Not indefinite.
• No training. The developer version never trains on your conversations. It's contractual, not a setting.
• No chat history at Anthropic. The developer version doesn't have a "your past conversations" feature at all. Here's what Anthropic actually retains when you go this route.

Side-by-side data flow

Same Claude model. Different rules. Here's the actual comparison.

The two rows that actually matter: where the chat is stored and retention at Anthropic. Everything else falls out of those two.

The 30-day retention window matters more than people think

"Anthropic isn't going to read my chats" is correct in the everyday sense. They aren't sitting around browsing user conversations. The classifiers are automated and narrow. Most chats never get a human eye on them.

The 30-day window isn't about Anthropic the company being curious. It's about what's producible.

Anything stored is subpoenable. If a court orders Anthropic to produce records about a specific user, IP address, or account during that 30-day window, your incognito chats are records. Anthropic isn't going to fight a valid subpoena to protect a free-tier user. Nor should you expect them to.

Retention windows are also breach windows. If Anthropic is ever compromised (and every company on the internet eventually has an incident of some shape), the data exposed is whatever's currently sitting in their systems. Zero retention removes the exposure entirely. 30-day retention means up to 30 days of your incognito chats are sitting there waiting.

For most casual chats, this is a theoretical concern. For Daniel's divorce question, or anyone asking Claude about a health diagnosis, a financial mess, or an employer they're thinking about leaving, it's a real one.

Where Incognito wins

Being honest: Incognito is the right call for most people, most of the time.

• It's free. No extra subscription. No API key. No paste-this-into-that step.
• It's already there. Built into Claude.ai. One click and you're in.
• Full feature parity. Same Claude. Same models. Same uploads. Same Projects (when applicable). Nothing got removed in incognito mode.
• It's enough for most people. If you're asking Claude to fix a regex or summarize an article or help with a presentation, the 30-day window doesn't really cost you anything.

If your threat model is "I don't want this chat appearing in my history when my partner uses my laptop," Incognito is the right tool. Done. Move on.

Where Private Claude wins

The shape of conversation that's a fit for Private Claude isn't most chats. It's a specific kind:

• Sensitive topics. Health questions. Mental health. A diagnosis you don't want sitting anywhere.
• Journaling. The kind of writing where you're not trying to perform for an audience, including a future audit of your own account.
• Finances. Tax messes. Old debts. Money decisions you'd rather think through without a paper trail at a third party.
• Legal questions. Anything that could become discoverable. Anything you'd ask a lawyer if you had one on retainer.
• Work conflicts. The boss situation. The cofounder situation. The "should I quit" draft of a resignation letter.
• Anything you don't want sitting in a database for any window. The phrase "any window" is the key. Incognito has a window. Private Claude doesn't.

Honest tradeoffs

Private Claude isn't a clean upgrade in every direction. Here's the cost.

You need an Anthropic key. Three minutes at console.anthropic.com. Free signup. Paste the key into Private Claude once. Done. But it's a step Incognito doesn't ask of you, and some people will bounce on it. Fair.

No chat history. By design. When you close the tab, the conversation ends. No saved threads. No scrolling back to last week. If you want to keep an answer, copy it before you close. This is the privacy tradeoff: history is the thing that creates risk, so we don't store any.

$17/mo for the paid tier on top of API spend. The free tier is 50 Haiku + 25 Sonnet messages, no card, BYOK. Enough to try, not enough to live on. Basic at $17/mo gets you unlimited messages, file uploads, and Markdown export. Pro at $37/mo adds a saved system prompt, a prompt library, and faster send. On top of that you pay your own Anthropic for usage (about $3 to $5 a month for casual use). Most users keep their existing ChatGPT or Claude Pro subscription and add Private Claude alongside it. About $40/mo total for both, including API spend.

If that math doesn't work for you, Incognito is right there. Free, built-in, 30-day retention you can live with. We're not trying to talk anyone out of it.