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Lumo AI Coupon: Up to 23% Off Plus Plan + Review

Most AI chatbots keep a copy of everything you type. Lumo AI, built by the Proton team behind Proton Mail and Proton VPN, takes the opposite route: your chat history is stored with zero-access encryption, so not even Proton can open it. It runs in your browser and on Android and iOS, and it's made for people who want help with work, money or health questions without feeding that data to an ad business.

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Lumo AI Coupon: Up to 23% Off Plus Plan + Review
Laura Marano Last updated Oct 13, 2026
Lumo AI Plus Yearly costs $119.88 right now instead of $155.88, a 23% saving that works out to $9.99 a month. The price applies automatically through the link below. The Monthly plan stays at $12.99. โœ… Checked Oct 2026 by Laura, with a 30-day money-back guarantee.

Lumo AI Coupons & Pricing

Active coupons

Lumo AI Plus

2 plans ยท best save 23%
Monthly

Monthly

Unlimited Projects | More Max model usage | Unlimited Custom Lumos

$12.99$12.99
Get Deal โ†’

Is this Lumo AI deal legit?

Is it safe?

Yes. The discount comes from Proton itself, and there’s no code to hunt for, because the saving is built into the yearly plan.

Official Proton checkout

You pay on Proton’s own site, not through a reseller or a key shop, so the subscription is tied directly to your Proton account.

Nothing hidden in the price

$119.88 is 12 months at $9.99. Compared with paying $12.99 every month, you keep $36 a year.

30-day money-back guarantee

Lumo Plus comes with a 30-day refund window, so trying the yearly plan isn’t a one-way bet.

Your chats stay yours

Lumo keeps no logs of your conversations, never uses them to train AI models, and stores your history with zero-access encryption under European (GDPR) privacy law.

How to Use the Lumo AI Coupon Code

How to use
  1. Click on the “Get Deal” button above to open Proton’s official Lumo page.
  2. Sign in with your Proton account, or create a free one. You can chat with Lumo as a guest, but Lumo Plus needs an account to attach the subscription to.
  3. Choose Lumo Plus and switch the billing period to 12 months. This step matters: the 23% saving only shows on yearly billing, so the monthly option will still read $12.99.
  4. Check that the total says $119.88, then pay on Proton’s checkout.
  5. Plus features unlock on your account straight away, in the browser and in the mobile apps.
Lumo AI Coupon Code
Lumo AI Coupon Code

Lumo AI Review & Features

Review

What sets Lumo AI apart is that Proton actually explains its privacy model instead of just promising one. Your message is encrypted on your device with a one-time key that only the Lumo server can unlock, so Proton’s own load balancers and queues pass along data they can’t read. Saved history then gets the same zero-access treatment as Proton Mail, locked behind your password. The honest catch, and Proton says it openly, is that the AI has to read your prompt in plain text to answer it.

Lumo AI Main Screenshot Coupon
Lumo AI Main Screenshot Coupon

At that moment you’re relying on Proton’s no-logs promise, not on math. That’s still a much stronger position than mainstream chatbots, and the open-source code means outside experts can check the claims. Day to day, it feels like a normal assistant: you type, it streams an answer, and the encryption stays out of your way.

Key features

  • Image generation: describe a visual and refine it, without your ideas being reused to train someone else’s results.
  • Built-in web search: real-time answers for current questions, with queries never used for ad targeting.
  • Proton Drive linking: connect files and folders to review code, summarize reports or work through documents securely.
  • Projects and Custom Lumos: organize work by client or topic (unlimited on Plus, one project on Free).
  • Thinking mode (Lumo 2.0): a slower, more careful reasoning mode for complex research questions.
  • 11 languages: English, Chinese, Spanish, French, Portuguese, Russian, German, Japanese, Korean, Italian and Dutch.

What we think

Pros
  • No chat logs and no AI training on your conversations, backed by published technical documentation.
  • Open-source code that has been independently audited, so the privacy claims can be checked.
  • Cheaper than the big-name assistants: $9.99/month on yearly billing.
  • A usable free tier, plus anonymous guest access over Tor with no account at all.
Cons
  • Not true end-to-end encryption while the AI is answering. The server reads your prompt in plain text and you trust Proton to discard it.
  • Proton doesn’t publish exact limits for the Free plan, so it’s hard to know when you’d actually need Plus.

mor Lumo AI Screenshots

Which Lumo plan should you pick?

Plan comparison
PlanPriceMax model usageMessages & historyImage generationProjectsCustom LumosBest for
Free$0LimitedLimitedLimited1Not includedOccasional private questions
Plus Monthly$12.99/monthMoreMoreMoreUnlimitedUnlimitedTesting Plus for a month or two
Plus Yearly$119.88/year (about $9.99/month)MoreMoreMoreUnlimitedUnlimitedDaily users who want the 23% saving

Lumo AI vs other AI assistants

vs Alternatives
ToolTypePriceFree optionWhere your prompts goBest for
Lumo Plus (our pick for privacy)Private AI chat assistant$119.88/yr Yes, plus guest accessProton’s own servers in Europe; no logs, no AI training, zero-access encrypted historySensitive work, health or money questions
Lorka AI ProMulti-model chat (GPT, Claude, Gemini and more)$69.99/yrTrial access advertised; exact free allowance not confirmedSent on to third-party model providersSwitching between big-name models in one app
MyClawAI chat + hosted AI agent (OpenClaw)$139.30/yr(LITE)Yes, limited guest messagesAI Chat uses routed models; hosted agents run in dedicated, isolated cloud environmentsRunning an always-on personal AI agent
ChatOn AI AssistantMulti-model chat app (mobile + web)$24/yrYes; limited access, with web trial allowancesSent on to third-party model providersCasual everyday AI on your phone, with an AI keyboard
1min.AIMulti-model AI toolkit$32/lifetime (Pro)Yes; Free plan and daily creditsSent on to third-party model providersBulk text, image and audio tasks on a budget

Frequently Asked Questions

Common questions

Do I need a coupon code for the Lumo AI discount?

No. The 23% saving applies automatically when you choose yearly billing for Lumo Plus. There’s no code field to fill in.

Is Lumo AI free?

Yes, Lumo has a free plan with limited messages, chat history, image generations and one Project. No credit card is required, and you can even use it as a guest without a Proton account.

Does Proton see my prompts while Lumo is answering?

Not in transit, but the AI itself reads them. Your message stays encrypted all the way through Proton’s internal systems until it reaches the Lumo server, which decrypts it to generate a reply. The server keeps no log of the request once the answer is sent, and your saved history is encrypted so only you can read it.

Is Lumo good for business use?

Yes, there’s a separate Lumo for Business plan with admin tools to manage team access. Proton says it’s designed to support GDPR and HIPAA compliance, backed by its ISO 27001 and SOC 2 certifications.

Is Lumo better than multi-model apps like Lorka AI or 1min.AI?

For privacy, yes; for model choice, no. Apps like Lorka AI and 1min.AI let you switch between GPT, Claude, Gemini and others, but they pass your prompts on to those providers. Lumo runs its own open-source models on Proton’s servers with no logs, so you trade some model variety for keeping your conversations private.

Can I get a refund on Lumo Plus?

Yes. Lumo Plus comes with a 30-day money-back guarantee, on both the Monthly and Yearly plans. That makes the Yearly plan a low-risk way to lock in the 23% saving: if Lumo doesn’t fit how you work, you can ask for your money back within the first 30 days.

System Requirements & Details

Tech details
FieldValue
PlatformsWeb browser, iOS and Android
AccountOptional on Free (guest access, including over Tor); a Proton account is required for Lumo Plus
LanguagesEnglish, Chinese, Spanish, French, Portuguese, Russian, German, Japanese, Korean, Italian, Dutch
File uploadsPlus supports multiple and large file uploads
IntegrationsLink files and folders from Proton Drive
Other requirementsInternet connection

Is Lumo AI Worth It?

Final overview
8.7Expert Score
Good

Lumo AI Plus is for people who use AI every day and don’t want their questions sitting in a Big Tech database. Its real strength is a privacy model you can actually inspect, from no-logs processing to encrypted history. The caveat is that open-source models may not match the top assistants on the hardest tasks, and light users can stay on the free plan. If you’re committing, take the Yearly plan at $119.88 and save $36 over paying monthly.
(Review by Laura โ€“ tech writer and software reviewer at WinningPC)

Overall
8.8
Functionality
8.7
Ease-of-use
8.8
Customer Support
9

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