Proton Lumo 2.0 Review: A Private ChatGPT Alternative That Finally Competes

Verdict: Privacy-first AI that is good enough for most people

Proton Lumo 2.0 is a privacy-first AI chatbot that aims to deliver ChatGPT-style text, image, and file analysis features while refusing to train on user data and keeping all conversations under strict data protection rules.

Lumo 2.0 is now a credible private ChatGPT alternative: for everyday writing, research summaries, and image generation, it stays close to OpenAI’s chatbot while going much further on data protection. It never uses your chats to train its models, offers zero-access encryption so Proton cannot read stored messages, and runs on European infrastructure governed by strict privacy laws. The trade-off is that ChatGPT remains more polished, with extras like live voice and specialised coding tools that Lumo does not yet match. If your top priority is privacy, not cutting-edge bells and whistles, Lumo 2.0 is ready for daily use at its free tier, with paid upgrades for heavier users.

Privacy and data protection: where Lumo 2.0 is strongest

Lumo 2.0’s main promise is simple: your AI assistant should not feed on your private life. Your conversations, file uploads, and prompts are not used to train the underlying models, unlike many mainstream chatbots where training opt-outs are optional rather than the default. There is also a Ghost mode to wipe chats as soon as you finish, further reducing lingering data.

Proton adds zero-access encryption, meaning messages are encrypted and only you can decrypt them; even Proton cannot read or repurpose them. As a data protection AI, Lumo sits on Proton’s own European infrastructure, under strict privacy laws that align with and go beyond common data protection regulations, with tough rules for foreign data requests. There is no third-party cloud partnership and no human review of chats, unlike some big-name bots that still sample conversations to “improve services”. For anyone handling sensitive business documents or personal records, that design is a clear practical advantage over convenience-first tools.

Features and performance: closer to ChatGPT than before

On paper, Proton Lumo 2.0 now ticks most of the mainstream AI feature boxes: it can answer questions, search the web, generate text and images, and analyse uploaded files in a single chat. You can switch between a fast mode for quick, simple answers and a reasoning mode (also called Thinking mode) for slower, multi-step problem solving. Lumo can also process text and images together, apply the same encryption to images, and has improved its image generation quality.

In independent testing, Lumo 2.0 shows a 127% improvement in speed, reasoning, and knowledge compared with Lumo 1.4 on the Artificial Analysis Intelligence Index. In hands-on comparisons, its generated images of a spaceship, forest cabin, and cartoon cityscape were roughly on par with ChatGPT’s, and at least one output was preferred. Its summaries of dense scientific papers in Thinking mode matched ChatGPT’s in quality and structure, and were sometimes clearer to read. The cost: Thinking mode is slower, and ChatGPT still offers more advanced tools around coding and live voice.

Workflow tools and Proton ecosystem integration

Beyond one-off chats, Lumo 2.0 adds features that are tailored to ongoing work. Deep contextual memory lets you control how much it remembers about you and your projects, improving follow-up conversations while still giving you the option to limit retention. Dedicated Projects act as secure workspaces where you can keep conversations, files, and instructions together, which is useful for teams dealing with documents and datasets over time.

Lumo also supports custom personas so you can turn it into a tutor, trainer, or personal assistant that behaves the way you prefer. Combined with improved web search that pulls live results with citations for news, finance, weather, and more, it aims to cut hallucinations while staying current. Lumo fits into Proton’s wider privacy-first ecosystem, alongside its encrypted email and VPN services, giving individuals and organisations a single provider for communication, storage, network protection, and now AI assistance. This cohesiveness makes Lumo appealing if you want a privacy-first AI chatbot that lives inside a broader secure environment rather than another isolated app.

Pricing, usability, and the privacy–convenience trade-off

You can try Lumo 2.0 on the web or mobile without paying, which lowers the barrier if you want to compare it directly with ChatGPT. A paid Plus / Pro tier costs between USD 9.99 and USD 12.99 per month (approx. RM46–RM60), depending on source, and adds full chat history, higher usage limits, larger file uploads, web search, access to more advanced AI models, and priority support. However, this subscription is separate from Proton’s other bundles, so existing mail or VPN subscribers do not get it automatically included.

In day-to-day use, Lumo 2.0 feels much more responsive and capable than its first version; one reviewer notes it has come a long way in answer quality and features. For casual and most professional writing, research help, and images, it is now close enough to the big names that privacy can be your deciding factor. You do lose some convenience: no live voice mode, fewer specialist coding tools, and a reasoning mode that trades speed for depth. But if you are wary of your prompts being stored, reviewed, or used to train future models, those sacrifices look reasonable in exchange for stronger defaults.

Buy if / Skip if

• Buy the Proton Lumo 2.0 if you want a privacy-first AI chatbot where your conversations are never used to train the models and cannot be read by the provider.
• Skip the Proton Lumo 2.0 if you rely heavily on live voice chat, advanced coding copilots, or the broad plugin ecosystems offered by more mature AI platforms.
• Buy the Proton Lumo 2.0 if you already use ProtonMail or ProtonVPN and want a cohesive privacy-first alternative for email, VPN, storage, and AI in one place.
• Skip the Proton Lumo 2.0 if you care more about cutting-edge convenience than about data protection AI features like strict data residency and zero-access encryption.
• Buy the Proton Lumo 2.0 if you are part of a team or business that needs EU-style data protection for documents, projects, and long-running AI-assisted workflows.
• Skip the Proton Lumo 2.0 if you expect your existing Proton subscription to cover AI, as the Pro / Plus tier is a separate monthly cost.