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Duck.ai is not a private, on-device chatbot. It sends your prompt to a third-party model, but DuckDuckGo says it removes identifying metadata such as your IP address, has agreements that prohibit provider training on conversations, and asks providers to delete prompts and replies after generating an answer. That protection has boundaries: date, timezone and region-derived preferences can accompany a request; short-lived provider caching and legal or abuse-prevention exceptions apply; chat history is saved locally unless you disable it; and optional Sync & Backup creates an encrypted server copy.
The most important distinction is between prompt handling, history storage, and file moderation. They follow different rules, so “Duck.ai is private” is too broad to be useful.
What happens when you send a Duck.ai prompt
Duck.ai routes each conversation to an underlying model operated by a third party. DuckDuckGo says it anonymizes the request before forwarding it and removes personal metadata, including the user’s IP address. The provider therefore receives the text needed to answer, but not an IP address that directly identifies the requester.
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| Context sent with the request | DuckDuckGo’s stated handling |
|---|---|
| Current date | Included for the listed providers so the model can interpret relative dates and current events. |
| User timezone | Included to improve time-sensitive answers. |
| Preferred unit system | Inferred from the user’s broad region and included as a preference. |
| Broad region | Estimated through a GEO::IP lookup. DuckDuckGo says it does not save the actual IP address or precise location. |
| Possible city-level location | The provider-sharing page says city-level location may be privately shared to tailor responses. |
DuckDuckGo says no personally identifiable information is passed to model providers. That statement should be read alongside the contextual-field description: the service strips direct identifiers while still sending limited context that can affect an answer. If a prompt itself contains your name, address, account number or another identifying detail, anonymization cannot make that text anonymous. Treat anything you type as content the model provider must process to generate a reply.
What model providers may do with prompts and replies
No conversational training, according to DuckDuckGo’s agreements
DuckDuckGo says neither it nor the underlying providers use Duck.ai conversations to train models. Its policy describes agreements requiring providers to delete prompts and responses after generating a reply, avoid training on conversations, and avoid sharing data with third parties for their own commercial purposes. Subprocessors working for a provider are an express exception to that last restriction.
These are contractual and policy commitments, not an independent audit of every provider’s systems. Provider names, model routing and terms can change, so the current Duck.ai privacy documentation is the controlling reference for a particular date.
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“Immediate deletion” has documented exceptions
The provider privacy help page uses “immediately after generating a reply” as the normal deletion commitment, but it also describes short-lived operational retention and legal or safety exceptions. The separate Duck.ai Privacy Policy and Terms of Service uses a broader service-level formulation: information is deleted once it is no longer necessary to provide outputs, at most within 30 days, subject to limited safety and legal-compliance exceptions.
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| Documented case | What DuckDuckGo says | How to interpret it |
|---|---|---|
| OpenAI prompt cache | Up to one hour in memory; the cache is not written to disk. | A short processing window, not permanent conversation storage. |
| Anthropic prompt cache | The same short-term, in-memory caching exception is listed. | Normal deletion language does not mean zero milliseconds of operational retention. |
| Anthropic legal or abuse-prevention retention | Retention can occur where required by law or needed to combat malicious use. | Safety and legal duties can override the ordinary deletion path. |
| Duck.ai policy-level deletion | Deletion once information is no longer needed to provide outputs, at most within 30 days, with limited safety and legal exceptions. | This is a broader policy statement and should not be collapsed into the provider help page’s “immediately” wording. |
DuckDuckGo’s documents describe different scopes: one explains provider-specific processing, while the policy gives an overall upper-bound formulation. The safest practical conclusion is that prompts are intended for short-lived processing and are not used for model training, but a prompt is not guaranteed to vanish before every operational, legal or abuse-prevention exception has elapsed.
Tinfoil-hosted models use a different visibility claim
For models hosted by Tinfoil, DuckDuckGo describes a Trusted Execution Environment (TEE). The stated design prevents Tinfoil from seeing prompts and responses. Uploaded files still go through the separate moderation route described below, outside the TEE channel, so the TEE statement should not be treated as a blanket rule for every kind of data sent through Duck.ai.
Where your chat history is stored
Local history is the default
Recent chats are saved locally on your device by default. DuckDuckGo says you can turn local history off in Duck.ai’s settings, delete individual conversations, or use the Fire Button to remove recent chats. Pinned conversations may require separate unpinning or deletion, so using the Fire Button does not necessarily remove every pinned item.
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Storage behavior depends on the client. In DuckDuckGo browsers, chats are kept locally outside ordinary browser web storage. In other browsers and apps, retention can also depend on that browser’s or app’s own storage and clearing settings. Local history is therefore different from provider retention: deleting a local copy changes what remains on your device, not necessarily the brief processing window already used to answer a prompt.
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Optional Sync & Backup creates an encrypted server copy
Sync & Backup is opt-in. When enabled, DuckDuckGo says conversations are stored on its servers in end-to-end encrypted form, with the master decryption key kept only on your devices. DuckDuckGo says it cannot decrypt and read the synchronized conversations.
This is a remote backup, not merely a setting that synchronizes browser pointers. The server copy exists so your devices can share history, and the policy says synchronized chats are automatically deleted after 18 months without access. That 18-month period applies to the inactive synced copy; it does not describe the lifetime of local history or the provider’s prompt-processing cache.
Sharing a chat is a separate disclosure
Duck.ai can generate a share link. The terms say the conversation is stored encrypted and the decryption key is embedded in the link. Anyone who receives that link can view the chat, so forwarding the URL effectively forwards the key as well.
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What DuckDuckGo says it collects for analytics
DuckDuckGo says it does not store prompts or information that could reveal chat contents for aggregate activity analysis, except when a user explicitly includes a conversation in feedback. Its described workflow is more specific than “no data is processed.”
- A prompt is converted to an embedding in memory.
- The temporary embedding is matched against a representative prompt from an open-source chatbot-conversation dataset.
- The embedding is discarded immediately after matching.
- The matched open-source representative prompt may be retained long term.
- DuckDuckGo retains anonymized aggregate statistics such as message counts, tokens used or features used.
This process is designed to measure broad usage without retaining the raw prompt as an analytics record. It still involves transient derived processing, and a user who deliberately submits a conversation through feedback creates a separate exception.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What happens to uploaded images and files
Images and files do not follow the same path as text-only prompts. DuckDuckGo says uploads are checked anonymously for child sexual abuse material (CSAM) by a third-party moderation provider and, in some cases, by the model provider.
- The moderation provider does not receive identifying information such as your IP address, except for information that may already be contained inside the uploaded file.
- Files are not retained when the check clears them.
- If a file is flagged as CSAM, DuckDuckGo says it is retained and reported to relevant authorities.
- The moderation process also applies when you select a Tinfoil-hosted model; uploads are sent to the moderation provider outside the TEE channel.
Do not upload a document merely because the model is hosted in a protected environment. A file can contain hidden metadata, names, faces, locations or account details, and moderation handling is a distinct disclosure from model inference.
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How to reduce what remains on your devices
Use the controls Duck.ai exposes rather than assuming that closing a tab erases a conversation.
- Open Duck.ai’s settings and turn off local chat-history saving if you do not want new chats retained on the device.
- Delete individual conversations you no longer need. Check pinned chats separately, because pinned items may not be removed by the Fire Button.
- Use the Fire Button when you need to clear recent chats quickly, then verify whether any pinned conversations remain.
- Leave Sync & Backup disabled unless you specifically need the same history on multiple devices.
- If you created a share link, revoke it before its selected expiration when the audience should no longer have access.
- Before sending a prompt or file, remove names, addresses, credentials, private keys, medical identifiers and other details that are not necessary for the answer.
These actions control local copies, synchronized backups and deliberate sharing. They do not retroactively change the text already processed to produce an answer, nor do they eliminate the provider-specific legal or abuse-prevention exceptions.
A practical privacy decision framework
| If you need to… | Use this approach | Privacy trade-off |
|---|---|---|
| Ask a general question with minimal exposure | Send a text-only prompt with identifying details removed; keep local history off if appropriate. | The third-party model still receives the prompt and limited contextual fields. |
| Continue work across your own devices | Enable Sync & Backup only when its encrypted server copy is worth the convenience. | Your history is remotely stored in encrypted form and is subject to the 18-month inactive-access deletion rule. |
| Show a conversation to someone else | Create a share link, choose the shortest useful expiry and revoke it afterward. | Anyone who obtains the link can read the conversation while it is valid. |
| Analyze a private document or image | Redact unnecessary identifiers and consider whether uploading is essential. | Files receive separate anonymous CSAM moderation and can be retained if flagged. |
| Use a model advertised with TEE protection | Remember that the TEE claim applies to model-host visibility, not to upload moderation or every surrounding service. | Uploaded files still leave the TEE path for moderation. |
What the privacy claims do—and do not—establish
DuckDuckGo’s documentation establishes its stated architecture and contractual promises: IP removal before provider forwarding, no conversational training, short-lived processing commitments, local history by default, optional encrypted synchronization and separate upload moderation. It does not independently verify provider behavior, prove that a technical or legal exception can never occur, or guarantee that a prompt containing identifying information becomes anonymous.
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The provider privacy help page, Duck.ai Privacy Policy and Terms of Service, and history help documentation were current in the materials reviewed on October 13, 2026. Model availability, provider lists, retention language and settings can change. Recheck those documents in Duck.ai before relying on a specific model, duration or control.
Bottom line
Duck.ai offers stronger privacy protections than sending a prompt directly to an unmanaged public chatbot, but it is still a gateway to third-party models. Keep the distinctions clear: anonymized forwarding is not zero context; “immediate” deletion has caching, legal and safety exceptions; local history is separate from encrypted Sync & Backup; shared links are readable by their recipients; and uploaded files undergo a separate moderation process. Use Duck.ai for low- and moderate-sensitivity work, redact information you do not need to disclose, and enable synchronization or sharing only for a deliberate reason.
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