# ChatGPT vs Lumo

> ChatGPT: OpenAI's AI assistant for writing, research, coding, image generation and voice chat
> Lumo: Privacy-first AI assistant from Proton with zero-access encrypted chats and no logging

- ChatGPT profile: https://finderatlas.com/tools/chatgpt
- Lumo profile: https://finderatlas.com/tools/lumo
- Comparison page: https://finderatlas.com/compare/chatgpt-vs-lumo
- Last reviewed: October 2026

## Verdict

ChatGPT and Lumo are both AI Assistants tools. ChatGPT scores higher in FinderAtlas's editorial review (8.9 vs 7.6 out of 10). Both have a free plan or trial. Only ChatGPT is available on Windows and macOS.

### Choose ChatGPT if

- You want a tool built for everyday questions, drafting and editing text, summarizing documents, coding help, data analysis and image generation in one assistant.
- One assistant covers text, voice, images, file analysis, search and coding.
- Free tier lets users try the service without a card.

### 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

| | ChatGPT | Lumo |
| --- | --- | --- |
| Pricing model | Freemium | Freemium |
| Free plan or trial | Yes | Yes |
| Starting price | $0 | $0 |

## Features

| Feature | ChatGPT | Lumo |
| --- | --- | --- |
| Chat with web search | Yes | Not listed |
| Voice mode | Yes | Not listed |
| Image generation | Yes | Not listed |
| File and image analysis | Yes | Not listed |
| Projects | Yes | Yes |
| ChatGPT agent | Yes | Not listed |
| Codex | Yes | Not listed |
| Connectors and apps | 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 |
| Custom Lumos | Not listed | Yes |
| Proton Drive Integration | Not listed | Yes |
| Guest Mode | Not listed | Yes |
| Memory and Personalization | Not listed | Yes |

## Platforms

| Platform | ChatGPT | Lumo |
| --- | --- | --- |
| Web | Yes | Yes |
| Windows | Yes | No |
| macOS | Yes | No |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | No | No |
| Browser Extension | No | No |

## ChatGPT strengths

- One assistant covers text, voice, images, file analysis, search and coding
- Free tier lets users try the service without a card
- Apps for web, iOS, Android, macOS and Windows with synced history
- Large ecosystem of connectors, projects and agent features
- Plans range from $8 to $500 per month, so users can match spend to usage

## ChatGPT limitations

- Free and Go usage limits are low and may include ads
- Pricing and model lineup change often, which makes limits hard to compare over time
- Answers can be wrong and need checking, especially for facts and citations
- The top Pro tiers cost $100 to $500 per month

## 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 ChatGPT better than Lumo?**

It depends on your workflow. ChatGPT is built for everyday questions, drafting and editing text, summarizing documents, coding help, data analysis and image generation in one assistant. 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 ChatGPT and Lumo?**

ChatGPT: OpenAI's AI assistant for writing, research, coding, image generation and voice chat. Lumo: Privacy-first AI assistant from Proton with zero-access encrypted chats and no logging. ChatGPT is rated 4.0/5 from 1 user review.

**Does ChatGPT or Lumo have a free plan?**

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

**Which is cheaper, ChatGPT or Lumo?**

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