Proton’s AI keeps no logs and locks every chat with encryption

Proton just launched the world’s most private AI

Proton, the Swiss company known for Proton Mail and VPN, has entered the AI game with Lumo, a privacy-first chatbot. Unlike its competitors, Lumo doesn’t log your chats or mine your data for training. It’s available on the web, iOS, and Android; you don’t need an account.

For anyone who’s ever hesitated to use ChatGPT or Gemini because of data concerns, Lumo might just be the AI we’ve all been waiting for.

Lumo keeps zero logs and encrypts every chat

Lumo isn’t just private, it’s built around zero-access encryption. That means not even Proton can read your saved chats. Everything is encrypted and stored on your device, never on Proton’s servers.

If you close the chat window in Ghost mode, the conversation is gone forever. It stands out as another AI with platforms that quietly log your interactions, often to train future versions. Here, your words stay yours, locked tight under encryption.

You can use Lumo without an account

One of the most refreshing features? Lumo doesn’t require a Proton account. Anyone can hop on, ask questions, and get help; no sign-up or login is needed. This is privacy by design, not marketing fluff.

Of course, if you log in, you’ll unlock the encrypted chat history and file uploads. But for casual users, it’s nice knowing you can get intelligent responses without sacrificing your identity or data.

Proton runs Lumo entirely on open-source AI

Transparency is key in privacy, and Proton nails it here. Lumo uses open-source language models, including Mistral’s Nemo and Nvidia’s OpenHands 32B. This means no secret code and no hidden trackers.

You or any developer can inspect how it works. Proton even released the complete source code for Lumo, so its commitment to transparency isn’t just talk; it’s fully verifiable, giving users more confidence than with black-box corporate AIs.

Lumo offers privacy across every platform

Lumo offers the same commitment to privacy whether you’re on mobile or desktop. It’s available via browsers, Android, and iOS. Unlike other AIs that treat mobile privacy as an afterthought, Lumo brings full end-to-end encryption across all devices.

Proton’s “zero-access” policy means even saved chats can only be decrypted locally. From typing your question to reading your answer, your conversation never leaves your control, no matter which device you use.

Lumo gives you ghost mode for disappearing chats

For the ultra-private user, Proton offers Ghost Mode. Think of it like Incognito, but for AI. When you activate Ghost Mode, your conversation will disappear as soon as you close the chat.

There’s no history stored, not even on your device. Whether you’re asking about sensitive topics or just want a one-off chat without any trace, Ghost Mode guarantees that nothing lingers once you’re done.

Your files are encrypted before they’re read

You can upload files directly to Lumo for analysis documents, notes, PDFs, and more. But unlike other AIs that might keep or analyze those files server-side, Lumo encrypts everything before processing it.

You can even connect your Proton Drive for seamless integration with complete privacy. This is AI that reads without spying, an impressive technical feat that aligns perfectly with Proton’s privacy-first ethos.

Proton’s servers are under Swiss jurisdiction

Why does Proton’s location matter? Swiss privacy laws are among the strongest in the world. Unlike U.S.-based AI companies that may be subject to data-sharing agreements like Five Eyes, Proton is under strict European GDPR protections.

That means your conversations with Lumo won’t be quietly subpoenaed, mined, or handed over to foreign governments.

This jurisdictional advantage is huge for journalists, researchers, or anyone who is privacy-conscious.

Lumo doesn’t train on your questions

When you talk to Lumo, your questions stay between you and the AI. Proton has clarified that your prompts will never be used to train future models. This contrasts with most mainstream AIs, which quietly improve their models using your interactions.

Proton believes AI shouldn’t learn at the cost of your privacy, and that’s a fundamental shift from the data-hungry norm.

No trackers, no shadow functions, no secrets

Lumo doesn’t hide its behavior in closed-source code or sneak in trackers. Its models are fully auditable, meaning security experts can inspect and verify what it’s doing.

Unlike services that disguise their telemetry tools or conceal how data is used, Proton puts it all on the table. It’s AI without surveillance, metadata, fingerprinting, and secure, respectful tech.

Lumo runs from Proton’s EU data centers

Where your data is processed matters. Lumo operates solely from European-based Proton data centers, giving users confidence that their info isn’t bouncing through unknown or risky locations.

This allows Proton to maintain strict control over physical security and server infrastructure. That’s a rare level of ownership and accountability in AI, another reason Lumo earns its privacy-first reputation.

You choose whether Lumo searches the web

Unlike other AIs that automatically ping the web (and log it), Lumo’s web search is opt-in. By default, Lumo operates locally. However, if you enable online search, it only uses privacy-friendly search engines to gather information.

Even then, your search data isn’t linked to you. This gives you flexibility without ever compromising privacy.

Proton transitioned to a nonprofit in 2024

In June 2024, Proton became a nonprofit foundation, enshrining privacy as its mission, not a side product. Lumo reflects that shift. It’s not built to harvest data or maximize ad revenue.

Every decision, from encryption to open source, is aligned with the organization’s nonprofit values. If you’ve ever wanted a reason to trust that a company isn’t putting profit over privacy, this structural change speaks volumes.

Proton never sells or shares user data

Proton has made a public pledge: no data selling, no surveillance, ever. That applies across all its services: Mail, VPN, Drive, and now Lumo.

There are no hidden contracts or third-party data partnerships. You’re not the product here; you’re the customer. With Lumo, even your anonymous usage is shielded from analytics abuse.

You can verify Lumo’s privacy claims

Because Lumo is open-source, developers, privacy watchdogs, or everyday users can inspect its code to confirm no hidden data grabs or backdoors. This transparency is rare in AI, where most tools operate behind closed doors.

Proton also publishes regular transparency reports and undergoes independent third-party audits, reinforcing its no-logs promise.

And with some VPNs hiding more than they protect, transparency matters more than ever. Google also warns of malware in popular VPN tools.

Lumo sets a new standard for AI privacy

Lumo isn’t just another chatbot. It’s a blueprint for what AI should be: transparent, secure, and centered on users, not data mining. In a digital world where every click, query, and keystroke can be monetized, Lumo dares to stand apart.

It doesn’t just promise privacy, it enforces it through open-source code, zero-access encryption, and no server-side logging.

For those tired of handing over data in exchange for convenience, Lumo offers a rare alternative: AI that works for you, not the advertisers. It’s privacy, redefined.

And it’s not the only one raising the bar. Proton VPN just leveled up, too. Proton VPN gets a major upgrade on all platforms.

What do you think about Proton’s AI assistance, which allows you to keep your data and information? Please share your thoughts and drop a comment

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This slideshow was made with AI assistance and human editing.