Lumo
by Lumo by Proton · Privacy-first AI chat assistant with zero-access encrypted conversations
36.7 — BenchRank score out of 100
Screenshots of Lumo
Homepage Pricing page
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
Pricing
Published plans from Lumo’s own pricing page, in GBP. Usage charges and add-ons may apply on top.
| Plan | Monthly | Annual (per month) | Includes |
|---|---|---|---|
| Lumo AI Plus | £10.39per month | £7.99 |
|
| Free | Free | — |
|
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
- MCP support
- 0 out of 100
- API quality
- 0 out of 100
- Documentation
- 0 out of 100
- Agent friendliness
- 68 out of 100
- Pricing transparency
- 85 out of 100
- Customer sentiment
- 80 out of 100
- Changelog
- 40 out of 100
- Marketing site structure
- 75 out of 100
- Operational trust
- 40 out of 100
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
- 30 out of 100
- Maintenance
- 15 out of 100
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