✨ AI assistants Open source Privacy ★★★★★
Proton Lumo
A Swiss AI assistant that says it does not log chats
Overview
Proton Lumo is an AI assistant from Proton in Switzerland.
Official pages say chats are not logged, not used for training, and that the code is public. Zero-access encryption is also described.
There is a free plan. Lumo Plus prices were confirmed on the official pricing page.
Scores
Privacy 5/5
Ease of use 4/5
Features 3/5
Value 4/5
Gemini — comparison
Gemini is tied to a Google account and other Google services. Lumo’s official materials say chats are not logged or used for training, and it can be used without a Google account.
Pros
- ✓ Official policy says chats are not logged and not used for training
- ✓ Same vendor as other Proton products
- ✓ You can start on the free plan
Cons & caveats
- − Supported apps and platforms should be checked on the official site
- − Model quality varies by task compared with Gemini and others
- − Paid-plan terms can change—read the official page before subscribing
Best for
- People who do not want chats used for training
- People already in the Proton ecosystem
- People who prefer a Swiss-jurisdiction provider
Not ideal for
- People who need a specific model or deep Google Docs integration
- People who only want a fully offline, on-device tool
Specs
- Pricing
- Free + paid — A free plan is available. Official embedded pricing (confirmed 2026-11-11): Lumo Plus is $12.99/month or $119.88/year ($9.99/month equivalent). Source: https://proton.me/lumo/pricing. An official Japanese page exists at https://proton.me/ja/lumo (confirmed 2026-11-11). The default /lumo and pricing pages render in English.
- Difficulty
- Easy
- Data location
- Switzerland (Proton).
- Platforms
- Web
Published no-training policyZero-access encryptionPublic codeFree plan
Migration from Gemini
- 1 Start new conversations in Lumo (you often do not need to move old Gemini threads)
- 2 Re-read official policy before pasting confidential material
- 3 Enable 2FA if you sign in with a Proton account
Setup steps
- 1 Open https://proton.me/lumo
- 2 Sign in with a Proton account if you want to
- 3 Try a short test question
- 4 If you consider a paid plan, read the official pricing page