ChatGPT vs Duck.ai: Capability or No Trace
ChatGPT needs an account and trains on your chats by default. Duck.ai needs nothing, stores nothing on a server, and does far less. Both are free.
Published October 1, 2026· By Juan Martinez
ChatGPT and Duck.ai are both free to open and use, which makes this an unusually clean comparison — there is no subscription to weigh before you get to the actual difference. The scores are not close, 5.4 against 7.5, and the gap is almost entirely one category. ChatGPT is the capability benchmark in this section: several model generations, deep research, Projects, custom GPTs, native apps. It also requires an account before the first message, stores conversations in a form OpenAI can decrypt, and treats consumer chats as training material until you turn that off. Duck.ai asks for nothing, forwards your prompt to someone else’s model with the identifying parts removed, and keeps the history in your browser rather than on a server. It is a thinner product by a wide margin. One was designed around what it can do; the other around leaving as little behind as possible.
| ChatGPT | Duck.ai | |
|---|---|---|
| Rating | 5.4 | 7.5 |
| Account Required | required | none |
| IP Anonymization | unknown | proxy-stripped |
| Storage Model | server-encrypted | client-local-only |
| Free Tier | limited | full |
| Platforms | Windows, macOS, Android, iOS | Windows, macOS, Android, iOS |
| Est. | 2022 | 2024 |
Account and identity: mandatory versus absent
Nothing about ChatGPT works anonymously. An email address or a linked identity comes before the first message, and from that point every conversation attaches to one profile. That is what makes Memory possible — ChatGPT carries details across sessions, which is most of why it feels useful over weeks rather than minutes — and it is also what makes a persistent profile the default state of the product. Memories can be viewed, edited and deleted one at a time, so the control exists. Accumulation is just what happens if you never use it.
Duck.ai asks for no email, no phone number and no card. You open the page and type. The consequence runs deeper than skipping a signup form: without an account there is no durable identifier for a history to accumulate against in the first place. There is no profile to manage because there is nothing holding one together.
This is the one axis neither product lets you reconfigure. You cannot run ChatGPT without an account, and Duck.ai has no account to create even if you wanted the things an account buys.
Where your conversation actually goes
ChatGPT encrypts conversations in transit and at rest, which protects against a stolen disk or a network attacker. It is not zero-access encryption: OpenAI holds the keys and can read conversation content for abuse review, for model improvement where training is on, or in response to a valid legal demand. The practical distinction is who decides, not what cipher is used — with server-side encryption the question of who reads your chats is a policy question. OpenAI’s documentation also makes no claim anywhere that your IP address is separated from the request before processing, and IP is collected and retained as log data. For products that do strip identity at a proxy layer, that is the kind of claim worth making, so its absence reads as a real absence rather than an oversight.
Duck.ai’s documentation states that metadata containing personal information — the IP address being the example given — is removed before the model provider is prompted, so the provider sees requests arriving from DuckDuckGo rather than from you. The company’s privacy policy adds that IP addresses are never logged to disk alongside Duck.ai chats in a form that could be tied back to a user, meaning the proxy step is not a relabelling exercise where the operator quietly keeps the mapping. Conversations themselves live in local browser storage, deletable one at a time or all at once with the Fire Button, with up to five pinnable.
The training default is the sharpest contrast. OpenAI may use consumer content to train its models, and opting out means finding a toggle under Settings and Data controls. The opt-out is real and it works — but it is an opt-out, so the default for every Free, Go, Plus and Pro user is that their conversations are training material until they intervene. There is also a trap worth naming: OpenAI documents that even after opting out, giving feedback on a response with the thumbs buttons may send the entire attached conversation into the training set. Those buttons look like a rating widget, not a consent mechanism. Duck.ai’s position is contractual instead of optional — Anthropic, OpenAI, Mistral, Azure and Tinfoil are all barred from training on Duck.ai conversations, with no setting for the user to find or accidentally undo.
Two caveats keep this from being a clean sweep. Duck.ai’s providers commit to deleting prompts and responses immediately after a reply, but prompts may sit in short-term cache memory for up to an hour, which is disclosed rather than discovered. And the hardware-enforced part of the architecture — a Trusted Execution Environment where the host cannot see the prompt or the response — applies to the two Tinfoil-hosted models, not to the other eight. Pick a Claude, GPT or Mistral model and the protection is the contract plus the stripped metadata, which is a weaker thing than an enclave. The other side has its own asymmetry: ChatGPT has a SOC 2 Type 2 report and four ISO certifications, while no independent third party has audited Duck.ai’s data flow at all, and its implementation is closed source. ChatGPT’s report is released through a request process aimed at enterprise buyers rather than published, so neither product gives a reader something they can open and check — but one has an auditor’s attestation behind the architecture and one has only the operator’s description of it.
Features and models: ChatGPT is not close to being matched
This is where the comparison inverts, and pretending otherwise would be dishonest. ChatGPT scores 8.7 on Features here against Duck.ai’s 7.0, and the gap is earned. Several model generations are selectable per tier, web search is built into the chat rather than bolted on, file upload covers documents, images and data files. Beyond that core sits image generation, voice conversation, deep research runs that compile sourced reports, data analysis with code execution, Projects for grouping conversations with shared context, scheduled tasks, custom GPTs, a coding agent and extensions for Excel, Word, PowerPoint and Google Sheets. Nothing in this section comes near that surface.
Duck.ai’s feature case is narrower and differently shaped. Ten models across four families, six of them free, with per-conversation switching — comparing how two families answer the same question takes one dropdown instead of two accounts, which is the practical argument for a front end like this. Image and PDF uploads work, but only on some models, with PDF page counts capped at 15 free, 35 on Plus and 50 on Pro. Spreadsheets are not supported at all. Image generation exists with an unpublished daily cap. There is no confirmed live web search inside the chat, so the models’ training data is the boundary on currency — a hard limit for any question about this week.
If the work involves a long document, a spreadsheet, a sourced research report or anything that needs today’s information, Duck.ai either cannot do it or does it with a ceiling you will hit quickly.
Price, platforms, and what you give up
Both base tiers are free, and both free tiers are real rather than trial clocks. ChatGPT allows unlimited text conversations on its base model, subject to abuse guardrails, with restrictions landing on uploads, image creation, voice, deep research, memory size and Codex access. Duck.ai gives six models, including both enclave-hosted ones, with no account, no card and no trial period — the only limit is an unpublished daily message cap you discover by reaching it.
Paid plans diverge more than the free ones. ChatGPT’s ladder runs from $6 a month, a plan OpenAI’s own pricing page says may include ads, through $20 and up to $100 and above. What paying does not buy is better data handling: Free, Go, Plus and Pro share the same training default, the same storage model and the same mandatory account. Duck.ai’s advanced models are not sold on their own at all — the $9.99 a month figure is DuckDuckGo’s entire four-in-one subscription with a VPN, personal information removal and identity theft restoration, with the better models as one quarter of the bundle. As an AI subscription in isolation that is poor value; as a privacy bundle where three other services come along, the arithmetic changes.
Platforms are closer than the feature gap suggests. ChatGPT has a dedicated app on each: desktop apps for macOS and Windows, mobile apps for iOS and Android, a Chrome extension, plus the web interface — only Linux is missing, and two desktop apps currently ship in parallel under confusingly similar names. Duck.ai has no standalone app of its own, but it’s built into the DuckDuckGo browser on the same four platforms, with a Search/Duck.ai toggle in the address bar and a dedicated Chats menu for history — Linux users are left with duck.ai in any browser, same gap as ChatGPT. What ChatGPT still wins outright is sync: Duck.ai’s storage is local to each device, so a conversation started on a laptop does not exist on the phone, and clearing browser data erases it. Five pinned conversations survive within a browser profile, which is enough for a working reference thread and not enough to treat this as a place where research accumulates.
What we didn’t compare, and why
ChatGPT’s Business, Enterprise and Edu tiers. These have a materially different data policy — OpenAI states it does not train on their inputs or outputs by default — and they exist above the consumer plans at per-seat pricing on request. They are not the product most readers open, and the full ChatGPT review scores the consumer tiers for that reason. Their existence is worth knowing for one reason only: the protective default is implemented and working, and it is applied to the customers whose procurement teams negotiate data terms rather than to the individual paying nothing.
The enclave on two of ten Duck.ai models. The Trusted Execution Environment is the strongest architectural claim on either side of this comparison, and it covers gpt-oss-120b and Gemma 4 31B rather than the product as a whole. Putting it in the table as a single yes-or-no row would make it read as a property of Duck.ai when it is a property of a model choice inside it, so it stays in prose where the scope can be stated.
Model quality. Which assistant gives better answers is not an axis either review scores. Duck.ai is a front end to models built by Anthropic, OpenAI, Mistral and others, so on several of its options the underlying model is from the same company as ChatGPT’s — comparing output quality would mostly compare model choices, not products.
Bottom line
Read the full ChatGPT review if the work needs the capability — deep research, Projects, custom GPTs, spreadsheet and document integrations, a coding agent, native apps on four platforms, current information pulled into the chat — and the conversations are casual enough that server-side storage OpenAI can read is an acceptable cost. If you land here, turn the training toggle off and leave the thumbs buttons alone.
Read the full Duck.ai review if the question you are about to type is the thing you want protected: no account to tie it to, no IP address passed to the model provider, nothing kept on anyone’s server, and a contractual no-training commitment instead of a setting you have to remember. You give up sync between devices, spreadsheets, live search and a large part of the feature surface — and you accept that nobody independent has audited any of it.