Proton Lumo vs VUST
Privacy Guarantees or Model Choice? Pick the Trade-off.
Lumo is the stronger fit when Proton's no-logs design, zero-access encrypted history and Proton-controlled model infrastructure are the priority. VUST is the stronger fit when you want to switch model families, work inside Telegram and hand jobs to specialist bots. They overlap, but they are not interchangeable.
Comparison basis
Official sources and limits
Lumo facts come only from Proton's own materials. VUST facts were checked against the live model picker and routing SSoT. This is a product-shape analysis, not a head-to-head quality benchmark.
Unless a separate method is stated above, this page does not claim a head-to-head product-quality benchmark.
Checked: 2026-07-20
Verdict by criterion
Where each one fits — line by line
Model choice and cross-checking
VUST
Several model families in one Telegram workflow, with Search, Summary, Study and Council flows for task-specific cross-checking.
Proton Lumo
One integrated assistant — the right pick when privacy matters most, not when you want to switch between models.
Current capability parity
VUST
Separate document, OCR and image routes with their own limits rather than one all-in-one assistant.
Proton Lumo
Lumo 2.0 already includes advanced reasoning, image generation, deep web search and long-term memory, and guest chat needs no account.
Where Lumo wins
Documented privacy guarantees
VUST
Claims no equivalent architecture and may route requests to external model providers.
Proton Lumo
Proton states no server-side chat logs, no training on chats and zero-access encrypted history — stronger documented privacy.
Scope
Lumo 2.0 already has reasoning, images, search and memory, and guest chat needs no account. VUST's difference is orchestration, not equivalent privacy.
Three situations, three honest choices
There is no absolute winner: the deciding criterion changes with the job.
Which product fits which decision
- Privacy-first users
- The prompt contains material you do not want retained or used for training
- Lumo has the clearer documented architecture: no server-side chat logs, zero-access encrypted history and Proton-controlled model serving.
- Model comparers
- The quality of one model is uncertain and you want another answer without changing products
- VUST lets you switch model families in one Telegram workflow and use the Council for structured cross-checking.
- Workflow routers
- A general chat is not enough for sourced search, a long document or study practice
- VUST routes those jobs to specialist Search, Summary and Study experiences instead of presenting one assistant as best at everything.
A practical way to choose
- 01
Start with the risk of the input
If privacy guarantees decide whether you can send the prompt at all, Lumo's documented architecture is the meaningful advantage.
- 02
Then inspect the workflow
If the job needs model comparison, sourced Search, document Summary or Study practice, VUST's routing is the meaningful advantage.
- 03
Test one representative task
Run the task you actually repeat. Do not infer quality from a feature list, and do not treat this page as a benchmark result.
Compare models on your own task
Open @vustbot, run one representative prompt, switch model families or route it to a specialist tool. Keep sensitive work in the product whose privacy boundary you accept.
Where the comparison stops
Lumo's privacy advantage is real
Proton documents no logs, no training on chats, zero-access encrypted saved history and models running on Proton-controlled servers. VUST does not claim the same boundary.
VUST's orchestration advantage is different
Multiple model families, specialist bots and Council cross-checking solve a routing problem. They do not cancel Lumo's privacy advantage.
No invented parity
Lumo 2.0 includes image generation, deep web search, reasoning and memory. VUST uses separate routes and providers; the products should be compared by the user's job, not by pretending either side lacks current features.
Frequently asked questions
Is VUST a direct replacement for Proton Lumo?
No. Both answer AI questions, but their product bets differ. Lumo centers privacy, encrypted history and Proton-controlled infrastructure. VUST centers model choice, Telegram-native access and specialist bots. Choose the trade-off, not the word alternative.
Which one is more private?
On documented product guarantees, Lumo has the stronger privacy position: Proton states that it keeps no server-side chat logs, does not train on chats and zero-access encrypts saved history. VUST does not claim an equivalent architecture and may route requests to external model providers.
Does Lumo require a Proton account or a separate app?
No for a guest web chat: Proton says anyone can start on lumo.proton.me without an account. An account is relevant for saved encrypted history and paid features, and mobile or desktop apps are optional. Earlier wording on this page overstated that friction and has been removed.
Why choose VUST instead?
Choose VUST when the job benefits from switching model families, comparing answers, staying in Telegram or moving into specialist Search, Summary and Study flows. That orchestration is the useful difference; it is not a privacy superiority claim.
Can both products work with current information and files?
Yes, but in different shapes. Lumo offers web search and file workflows inside one assistant. VUST separates sourced Search, document Summary and OCR-assisted text extraction into specialist routes. Check the current limits at the point of use because both products evolve.
How was this comparison checked?
Lumo claims were checked against Proton's Lumo 2.0 announcement and privacy documentation on July 20, 2026. VUST claims were checked against the live model picker and current internal routing documentation on the same date. No head-to-head quality benchmark is claimed.
Explore the VUST workflow before deciding.
Ready when you are
Choose by the trade-off, then test the real task.
Lumo for the stronger documented privacy boundary. VUST for model choice, Telegram workflow and specialist routing.