# Grok vs Lumo

> Grok: xAI's AI assistant with live X and web search, image and voice tools
> Lumo: Privacy-first AI assistant from Proton with zero-access encrypted chats and no logging

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

## Verdict

Grok and Lumo are both AI Assistants tools. Grok scores higher in FinderAtlas's editorial review (8.3 vs 7.6 out of 10). Both have a free plan or trial. Only Grok offers an API.

### Choose Grok if

- You want a tool built for questions that need current information from X and the web.
- Searches both X posts and the web for current information.
- Free tier available without a subscription.

### 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

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

## Features

| Feature | Grok | Lumo |
| --- | --- | --- |
| Live Search | Yes | Not listed |
| Chat and Reasoning | Yes | Not listed |
| File and Image Analysis | Yes | Not listed |
| Grok Imagine | Yes | Not listed |
| Voice Mode | Yes | Not listed |
| Conversation Import | Yes | Not listed |
| Shared Subscription | Yes | Not listed |
| xAI API | 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 | Grok | Lumo |
| --- | --- | --- |
| Web | Yes | Yes |
| Windows | No | No |
| macOS | No | No |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | Yes | No |
| Browser Extension | No | No |

## Grok strengths

- Searches both X posts and the web for current information
- Free tier available without a subscription
- Image and video generation in the same app as chat
- Separate API with long context windows (up to 1M tokens on some models)
- Real-time voice mode in the mobile apps

## Grok limitations

- Free usage is capped, and xAI does not publish the exact limit
- Usage limits are given only as multiples of the Plus plan, not as fixed numbers
- Answers drawing on X posts can reflect unverified social content
- The App Store rates the app 16+ because of mature themes

## 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 Grok better than Lumo?**

It depends on your workflow. Grok is built for questions that need current information from X and the web. 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 Grok and Lumo?**

Grok: xAI's AI assistant with live X and web search, image and voice tools. Lumo: Privacy-first AI assistant from Proton with zero-access encrypted chats and no logging. Grok is rated 4.0/5 from 1 user review.

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

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

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

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