Lumo
by Lumo by Proton · Privacy-first AI chat assistant with zero-access encrypted conversations
BenchRank score
Screenshots of Lumo
Homepage
Overview
Lumo is an AI chat assistant from Proton. Conversations are stored with zero-access encryption, and Proton states it cannot read them or use them to train models; the code is open source. Alongside chat it generates images, analyses data and organises work into Projects, and can pull context from files and folders linked via Proton Drive.
- Best for
- People who want a general AI chat assistant whose conversations the provider cannot read.
- Pricing
- Free plan at £0.00, then Lumo AI Plus at £10.39/month, or £7.99/month billed annually (£95.88 a year).
- Runs on
- iOSAndroid
Strengths and trade-offs
Strengths
- Chats stored with zero-access encryption; Proton cannot read them
- Code is open source, so the privacy claims can be checked
- European service under GDPR; delete your account at any time
- Free plan needs no credit card
Trade-offs
- Free plan limits messages, chat history, images and caps Projects at 1
- Business plan pricing is not published on the pricing page
- Underlying models are unnamed; only 'Max model usage' limits are described
- Only Proton Drive is named for adding file context; no other integrations
How Lumo markets itself
A structured read of the promise, proof and page design on Lumo’s captured homepage.
Homepage capture
“The confidential AI chat assistant”
- Angle: Security / trust-led
- Hero: Form in hero
Pricing
Published plans and prices from Lumo’s own pricing page.
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
MCP support
Whether an agent can drive the product through the Model Context Protocol, and how much setup that takes.
API quality
Public API surface: machine-readable spec, official SDKs, documented auth, errors, rate limits and versioning.
Documentation
Publicly reachable docs — coverage, freshness, code samples and machine readability.
Agent friendliness
How readable the site is to an automated client: llms.txt, structured data, server-rendered content, crawler access.
Pricing transparency
Whether real prices are published, self-serve signup exists, and usage costs are knowable without a sales call.
Customer sentiment
Third-party ratings, shrunk toward the catalogue mean by review volume and corroborated across independent sources.
Changelog
A public, dated record of what shipped and when — the clearest signal that a product is still alive.
Marketing site structure
Whether the site answers a buyer's questions: clear positioning, the pages that matter, and accessibility.
Page speed
How fast the site loads for real visitors: Chrome UX Report 75th-percentile LCP, INP and CLS, with a Lighthouse mobile run standing in where a site has too little traffic for field data.
Operational trust
Status page and incident history, security disclosure, compliance and data-processing documentation.
Measured, but not part of the score
Useful to know, but not a mark for or against the product — so these do not affect the ranking.
Openness
Source availability, self-hosting, data export and open standards. Scored and shown, but not part of the composite — paid SaaS is not worse for being paid SaaS.
Maintenance
Release cadence and repository activity. Scored and shown, but not part of the composite — it is only measurable for open repositories.
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Where this comes from
The Lumo pages BenchRank reads when it scores the product — its documentation, release notes, status and security pages, and its repository where there is one.
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Is this your product?
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