# Duck.ai vs Lumo

> Duck.ai: Chat with ChatGPT, Claude and other AI models without handing over your data
> Lumo: Privacy-first AI assistant from Proton with zero-access encrypted chats and no logging

- Duck.ai profile: https://finderatlas.com/tools/duck-ai
- Lumo profile: https://finderatlas.com/tools/lumo
- Comparison page: https://finderatlas.com/compare/duck-ai-vs-lumo
- Last reviewed: October 2026

## Verdict

Duck.ai and Lumo are both AI Assistants tools. Duck.ai scores higher in FinderAtlas's editorial review (7.8 vs 7.6 out of 10), led by ease of use and value for money. Both have a free plan or trial. Only Lumo is available on iOS and Android.

### Choose Duck.ai if

- You want a tool built for everyday questions and drafting where you do not want chats tied to an account or used for training, and trying several models in one place.
- Free tier works without an account.
- Personal metadata such as IP address is removed before prompts reach providers.

### Choose Lumo if

- You want a tool built for everyday AI chat, web-assisted questions, document and image work without conversation logging or training on user data.
- Zero-access encryption on saved chats, with a stated no-logging policy.
- Open-source code and open-source models that can be inspected.

## Pricing

| | Duck.ai | Lumo |
| --- | --- | --- |
| Pricing model | Freemium | Freemium |
| Free plan or trial | Yes | Yes |
| Starting price | $0 | $0 |

## Features

| Feature | Duck.ai | Lumo |
| --- | --- | --- |
| Multi-model chat | Yes | Not listed |
| No account required | Yes | Not listed |
| Metadata removal | Yes | Not listed |
| No training on chats | Yes | Not listed |
| Local recent chats | Yes | Not listed |
| Voice chat | Yes | Not listed |
| Image generation | Yes | Not listed |
| File and image upload | Yes | Not listed |
| Subscription bundle | Yes | Not listed |
| Zero-Access Encrypted Chats | Not listed | Yes |
| Open-Source Models | Not listed | Yes |
| Web Search | Not listed | Yes |
| Image Generation and Editing | Not listed | Yes |
| Projects | Not listed | Yes |
| Custom Lumos | Not listed | Yes |
| Proton Drive Integration | Not listed | Yes |
| Guest Mode | Not listed | Yes |
| Memory and Personalization | Not listed | Yes |

## Platforms

| Platform | Duck.ai | Lumo |
| --- | --- | --- |
| Web | Yes | Yes |
| Windows | No | No |
| macOS | No | No |
| iOS | No | Yes |
| Android | No | Yes |
| API | No | No |
| Browser Extension | No | No |

## Duck.ai strengths

- Free tier works without an account.
- Personal metadata such as IP address is removed before prompts reach providers.
- Chats are not used for training by DuckDuckGo, and providers agree not to train on them.
- Several providers' models are available from one interface.
- Plus ($9.99/month) bundles a VPN and identity protection services.

## Duck.ai limitations

- Free tier is limited by daily usage caps, and the paid limits are not published as numbers.
- Strongest models are subscriber-only, and the top tier costs $19.99/month.
- No public API and no standalone mobile app found.
- Chat history is local by default, so it does not sync across devices without opting into Sync & Backup.

## Lumo strengths

- Zero-access encryption on saved chats, with a stated no-logging policy.
- Open-source code and open-source models that can be inspected.
- Permanent free tier with guest access and no credit card.
- Web, iOS and Android apps.
- Run by Proton AG, a Swiss company, and stated to comply with GDPR.

## Lumo limitations

- Free chat history is kept for only 7 days.
- Uses open-source models rather than the proprietary frontier models of larger rivals.
- No desktop app or public API found.
- Lumo Plus limits are described only as "more" than Free, not as numbers, and the plan costs $12.99/month ($9.99/month billed annually).

## FAQ

**Is Duck.ai better than Lumo?**

It depends on your workflow. Duck.ai is built for everyday questions and drafting where you do not want chats tied to an account or used for training, and trying several models in one place. Lumo is built for everyday AI chat, web-assisted questions, document and image work without conversation logging or training on user data.

**What are the key feature differences between Duck.ai and Lumo?**

Duck.ai: Chat with ChatGPT, Claude and other AI models without handing over your data. Lumo: Privacy-first AI assistant from Proton with zero-access encrypted chats and no logging.

**Does Duck.ai or Lumo have a free plan?**

Yes, both do. Duck.ai is freemium and Lumo is freemium, and each has a free plan or trial.

**Which is cheaper, Duck.ai or Lumo?**

Both can be used for free. Paid plans differ in limits and features, so compare the tiers in the pricing table above.