Your chats are not training material
Proton states that Lumo does not use your conversations to train its AI models.
THE THOUGHTFUL TECH EDIT · PROTON LUMO
A clearer head.
A more private chat.
The email you need to write. The week you need to untangle. The idea you want to explore. Meet Lumo, Proton’s AI assistant built around privacy.
Affiliate disclosure: We may earn a commission if you purchase through our links. This is an independent Financial Diet Blog guide. How we earn
Explore the free option or review Plus on Proton. Current features, limits and billing terms are shown there.
A LITTLE SPACE TO THINK
What is on
your mind today?
Start small. A better question can be the first step toward a calmer day.
- Turn a rough note into a clear email ↗
- Break a busy week into manageable steps ↗
- Think through a purchase before spending ↗
Ideas from our editors. Open Lumo to start an actual conversation.
AI ASSISTANCE, WITH PRIVACY IN MINDFROM THE MAKERS OF PROTON MAILFREE & PAID OPTIONS
WHY LOOK AT LUMO?
Your questions deserve
a little more privacy.
Choosing an AI tool is also a choice about how your information is handled. Lumo’s published approach puts that question up front.
Read Proton’s security explanation ↗Protection for saved conversations
Proton describes zero-access encryption for stored chat history: decryption keys are protected through your account credentials.
Know what the security model means
The model must process readable text to answer. Proton distinguishes encrypted transmission to the model from encryption of stored history, and says the model server does not retain chat logs.
MAKE IT USEFUL FROM THE FIRST QUESTION
Less staring at a blank box.
More getting started.
Pick an everyday task. Copy the prompt, open Lumo, and adapt it to what you need.
These examples are prepared by our editors. This page does not send a question to an AI service.
YOUR STARTING POINT
Find the words. Keep your voice.
Good for the email you have been putting off. Add your own details after checking the draft.
Ready when you are.
Take your next step with Lumo
SMALL TASKS. A LITTLE MORE HEADSPACE.
One useful answer
can move the day along.
Imagine finishing work with an unanswered email, a list of errands and a purchase you still need to research. Start with one task: ask for a clearer draft, a simple plan or a comparison checklist.
Give the result a careful read. Keep what helps, change what does not, and verify the details before you act. The goal is a useful starting point that supports your own judgment.
Illustrative scenario, not a claim of measured time savings or hands-on product testing.
A SUBSCRIPTION SHOULD EARN ITS PLACE
Start with your needs.
Then choose your plan.
Our buying advice: try a few real tasks before adding another recurring payment. Upgrade when the extra capacity is something you will actually use.
Lumo Free
Proton offers a free tier with usage limits.
- A way to explore the service before paying.
- Try the tasks that matter most to you.
- Review the current allowances on Proton.
A practical starting point for occasional use.
Explore Lumo’s free optionLumo Plus
The paid option expands usage and access to features. Exact allowances are set by Proton.
- Consider it if free limits interrupt useful work.
- Check the total charge and billing interval.
- Review renewal and cancellation terms.
Choose it for repeat value, not a headline discount.
Review current Plus plansThis guide does not quote a fixed price. Currency, tax, billing cycle, availability and plan limits may vary or change.
THE FINANCIAL DIET VIEW
A thoughtful addition
to your digital routine.
Worth exploring if…
You want help drafting, organizing or thinking through everyday questions, and you care about the provider’s approach to privacy.
Keep your judgment in the loop
AI can make mistakes. Verify facts, calculations and sources. Follow your workplace’s rules before sharing business information, and use qualified advice for significant financial, legal or health decisions.
A FEW THINGS TO KNOW
Before your first chat.
Is this Proton’s official website?
No. Financial Diet Blog is an independent publication and affiliate. Our buttons use our partner link to take you to Proton’s service or offer. Proton handles accounts, subscriptions and support.
Does “private” mean the AI cannot read my question?
No. The model needs to process your question to answer it. Proton’s security model explains how requests are protected in transit and how saved history is encrypted. Read that explanation to decide whether the service fits your needs.
Can I try Lumo before paying?
Proton lists a free option alongside Plus. Check its current limits and availability, then try a representative task before deciding whether a subscription is worthwhile.
Are the prompt examples live AI answers?
No. They are editable prompts written by our editors. Copy one and open Lumo to use it there. We do not collect the text you type into the prompt box.
Will using the link guarantee a discount?
No. We do not promise a special price. Review the offer, billing period, total charge and renewal conditions shown by Proton before subscribing.
MAKE SPACE FOR YOUR NEXT GOOD IDEA
Bring your questions.
Find a clearer starting point.
Explore a privacy-focused way to put AI to work in everyday life.
Discover what Lumo can doAffiliate link · Opens Proton’s offer in a new tab
SOURCES & TRANSPARENCY
Read the details for yourself.
Based on Proton’s published descriptions, checked November 2, 2026. Privacy statements are the provider’s claims, not an independent security audit. Our task examples and subscription advice are editorial guidance.
Explore Proton LumoAffiliate link · Check current plans on Proton