Lumo AI review
Lumo delivers on its core promise: AI chat that not even Proton can read. Raw capability still trails frontier models, but for users handling sensitive work, that privacy guarantee is worth the trade-off.
Pros
- +Zero-access encryption
- +No training on your data
- +Ghost Mode for private sessions
Cons
- -Weaker than frontier AI rivals
- -Tight limits on free tier
- -No image upload support
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Most AI assistants are built on a familiar arrangement: you get useful tools, the company gets your data. Lumo, launched by Swiss privacy company Proton in July 2025, refuses that deal entirely. Every conversation is protected by zero-access encryption, no logs are kept server-side, and your chats are never used to train the...
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