Lumo is genuinely private. For confidential work, one thing still differs.
This is the fair fight. Proton's Lumo is a real privacy tool from a company that has earned its trust, and neither Lumo nor Hush trains on your data. If you want a private personal assistant, Lumo is a fine, low-cost choice. The single thing that decides it for regulated professional work is what happens to your words after you send them.
Kept, encrypted, versus not kept at all
By Proton's own description, Lumo saves your conversations with zero-access encryption, so that only you can read them and Proton cannot. For most people that is more than enough. But for a professional holding other people's privileged or clinical data, an encrypted copy is still a copy: it can be lost, it can be demanded in disclosure as ciphertext, and it is one more thing to defend.
Hush keeps no conversations or documents. What you send is processed, then it is gone. There is no stored conversation, encrypted or otherwise, to leak, to hand over, or to explain to a client. That is the whole difference, and for confidential work it is the one that matters.
| Hush AI | Lumo (Proton) | |
|---|---|---|
| Trains on your data | Never | Never |
| Keeps a copy of your chats | No conversations or documents kept | Stored, zero-access encrypted |
| Where it runs | Hardware Hush owns, in the UK | Proton's European infrastructure |
| Built for a UK profession's workflow | Yes, drafting + templates | General-purpose assistant |
| One-click audit-log export for your IG lead | ✓ all plans | Not a stated feature |
| Try with no account | ✓ on the homepage | ✓ guest access |
| Free personal tier / lowest price | From £39/month | Free tier, cheaper paid tier |
Rows describe each product from its own public materials as of July 2026 (Proton's Lumo pages at proton.me/lumo). Both products state they never train on your content. Lumo's own pages describe stored, zero-access-encrypted history and a free tier plus a paid tier; check proton.me/lumo for current limits and prices. Spot an error? Tell us and we will correct it within one working day.
What Lumo does better than us
Lumo is cheaper, with a genuinely useful free tier, and it is backed by Proton, one of the most trusted names in privacy, with extras like guest access over Tor. If you are an individual who wants a private assistant for personal writing and thinking, Lumo is excellent value and we will not pretend otherwise. Paying £39 a month for Hush only makes sense when the work is confidential and the stakes are professional.
Where Hush is built for a different job
Hush is not a general chat app with a privacy setting. It is built for UK regulated work: it keeps no conversations or documents, runs on hardware we own in the UK, drafts the documents a practice actually produces, and hands your information-governance lead a one-click audit-log export. When your duty of confidentiality is owed to a client or a patient, "no conversations or documents kept, in the UK, with a trail you own" is what your DPIA and your regulator are asking for.
Not sure where your current tools land? The free AI privacy checker walks you through it, seven questions, no email, no tracking.
Choose Lumo for a low-cost, genuinely private personal assistant from a trusted privacy company, where the data is your own and an encrypted history is exactly what you want.
Choose Hush when you are working with clients', patients' or employees' confidential data under UK professional rules, and you need a tool that keeps no conversations or documents, runs on hardware we own in the UK, drafts under your review, and gives you an audit trail you own.
Test Hush on your real, confidential work.
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Start Free → Run the CheckerFrequently asked questions
Does Lumo by Proton store your conversations?
Yes. By Proton's own account, Lumo saves your conversations with zero-access encryption, so only you can read them and Proton cannot. That is a strong consumer privacy design. Hush AI takes a different posture for regulated work: it keeps no conversations or documents, so there is no stored copy to lose, be compelled to produce, or become a target, even an encrypted one.
Which private AI is right for UK regulated professional work?
For a private personal assistant, Lumo is excellent value and genuinely private. For a solicitor, GP, accountant or HR professional handling other people's confidential data under UK rules, Hush AI is built for the job: no conversations or documents are kept, it runs on hardware Hush owns in the UK, and it ships profession-specific drafting and a one-click audit-log export your information governance lead can file.