# Lumo

> Proton's private AI assistant with zero-access encrypted chats

Lumo is Proton's AI assistant, built around keeping conversations private: chats are stored with zero-access encryption that Proton says it cannot read, and they are not used to train models. It answers questions, searches the web, generates images and works with files linked from Proton Drive, and its code is open source. The free plan can be used without an account, with Lumo AI Plus above it.

- **Category:** AI Assistants
- **Made by:** Proton AG (since 2025)
- **Website:** https://lumo.proton.me
- **Runs on:** Web, iOS, Android
- **Facts last checked:** Oct 5, 2026

## Pricing

Lumo has a free plan. Paid plans start at $9.99 per month, billed yearly ($119.88), or $12.99 billed monthly.

- **Pricing model:** Free plan
- **Free plan:** Free plan, usable without a Proton account: limited Max model usage, messages, chat history and image generations, 1 Project, web search and uploads of individual small files.
- **Free trial:** None listed.

| Plan | Price | What you get |
| --- | --- | --- |
| Free | $0 | Limited Max model usage, messages, chat history and image generations, with 1 Project. No credit card required. |
| Lumo AI Plus | $9.99 per month, billed yearly ($119.88); $12.99 billed monthly | More Max model usage, messages, chat history and image generations, unlimited Projects and Custom Lumos, with a 30-day money-back guarantee. |

Read from https://proton.me/lumo/pricing on Oct 5, 2026. Prices change, so confirm with Lumo before buying.

## Ways to pay less

- **23% off with yearly billing** (Annual discount): Proton's pricing page lists Lumo AI Plus at $9.99 a month when billed yearly ($119.88 every 12 months) against $12.99 billed monthly, labeled as 23% off. Source: https://proton.me/lumo/pricing

## App Store prices by country

"Lumo Plus (1 month)", as each country's App Store showed it on Oct 9, 2026. These are the app's prices, not the website's.

| Country | Price | In US dollars |
| --- | --- | --- |
| United States | $12.99 | |
| United Kingdom | £10.90 | about $14.41 (11% more) |
| Germany | 12,99 € | about $14.56 (12% more) |
| Canada | $16.49 | about $11.59 (11% less) |
| Australia | $21.49 | about $15.00 (15% more) |
| India | ₹ 719 | about $7.43 (43% less) |
| Brazil | R$ 42,99 | about $8.59 (34% less) |
| Mexico | $163.00 | about $8.96 (31% less) |
| Turkey | ₺329,90 | about $6.71 (48% less) |
| Indonesia | Rp 129ribu | about $7.21 (44% less) |
| Philippines | ₱ 489.00 | about $7.78 (40% less) |
| South Africa | R164.99 | about $9.98 (23% less) |

## Key features

- **Zero-access encrypted chats:** Conversations are stored with zero-access encryption so that only you can read them; Proton says it cannot access them.
- **No training on your chats:** Proton states that conversations are never used to train AI models, to target ads or to build a personal profile.
- **Web search:** Built-in web search brings real-time information into answers. It is included in the free plan.
- **Files and Proton Drive:** Link files and folders from Proton Drive to give Lumo context. The free plan uploads individual small files; Plus allows multiple large files.
- **Image generation:** Turns a description into an image and lets you refine it through follow-up prompts.
- **Open-source code:** Lumo's code is published as open source, which Proton says lets anyone verify that it is private and secure.

## Good for

- People who want an assistant that cannot read or reuse their chats
- Proton users who already keep files in Proton Drive
- Trying a private assistant without creating an account

## Worth knowing

- The free plan limits Max model usage, messages, chat history, image generations and uploads, and allows 1 Project; Proton gives no exact numbers.
- The download menu lists iOS and Android apps and a web app; no desktop app is listed.
- Business use is sold separately, as Lumo Professional or as part of Proton Workspace.

## What people say

- **App Store rating of the iPhone and iPad app:** 3.9 out of 5 from 537 ratings in the United States, read Oct 5, 2026. This is the store's rating of the app, not a score from ToolGPA. Source: https://apps.apple.com/us/app/id6746714949

## Works with

Proton Drive

**Tags:** Chat assistant, AI search, Open source, AI features

## Alternatives

- [Duck.ai](https://toolgpa.com/tools/duck-ai): Private, anonymized chat with third-party AI models. [Compare](https://toolgpa.com/compare/duck-ai-vs-lumo)
- [Venice](https://toolgpa.com/tools/venice): Privacy-focused AI app for chat, images and video across many models. [Compare](https://toolgpa.com/compare/lumo-vs-venice)
- [Confer](https://toolgpa.com/tools/confer): End-to-end encrypted AI assistant from the creator of Signal. [Compare](https://toolgpa.com/compare/confer-vs-lumo)
- [Mistral Vibe](https://toolgpa.com/tools/mistral-vibe): Mistral's AI chat assistant and coding agent, formerly Le Chat. [Compare](https://toolgpa.com/compare/lumo-vs-mistral-vibe)
- [ChatGPT](https://toolgpa.com/tools/chatgpt): OpenAI's general-purpose AI assistant for chat, images and voice. [Compare](https://toolgpa.com/compare/chatgpt-vs-lumo)

## Sources

The prices, plans, platforms and features above were read from these pages on Oct 5, 2026:

- https://proton.me/lumo/pricing
- https://proton.me/lumo
- https://lumo.proton.me
- https://en.wikipedia.org/wiki/Proton_AG

Page: https://toolgpa.com/tools/lumo
Listed by ToolGPA (toolgpa.com).