Confer vs Lumo
Price, platforms and features side by side. The table says where each price was read and when.
Confer
End-to-end encrypted AI assistant from the creator of Signal
Lumo
Proton's private AI assistant with zero-access encrypted chats
Where they differ
- Confer starts at $34.99 (Confer Membership, US App Store; billing period not shown). Lumo starts at $9.99 per month, billed yearly ($119.88), or $12.99 billed monthly.
- Only Lumo lists an Android app.
- Confer is end-to-end encrypted, according to its own site.
- Lumo is open source, according to its own site.
At a glance
| Confer | Lumo | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | $34.99 (Confer Membership, US App Store; billing period not shown) | $9.99 per month, billed yearly ($119.88), or $12.99 billed monthly |
| Free plan | Free to start with no credit card: up to 5 chats and a daily message limit. Attachments, connectors and folder custom instructions are Member features. | Free plan, usable without a Proton account: limited Max model usage, messages, chat history and image generations, 1 Project, web search and uploads of individual small files. |
| Free trial | None listed | None listed |
| Web | ||
| iOS | ||
| Android | ||
| Made by | Confer Enterprises, Inc | Proton AG |
| Price read from | apps.apple.com | proton.me |
| Checked | Oct 6, 2026 | Oct 5, 2026 |
Who each one suits
Confer
- Discussing health, money or work without leaving a readable server-side record
- People who trust Signal's approach and want the same for AI chat
- Gmail, Google Drive and Google Calendar users who want private connectors
Lumo
- People who want an assistant that cannot read or reuse their chats
- Proton users who already keep files in Proton Drive
- Trying a private assistant without creating an account
Worth knowing
Confer
- The membership is listed at $34.99 as an in-app purchase on the US App Store with no billing period shown, and the website shows no price before sign-in.
- The free plan is capped at 5 chats and a daily message limit; attachments, connectors and folder custom instructions need a membership.
- It is available on the web and iPhone only. The App Store listing says the app is only for iPhone and requires iOS 26 or later.
- Confer runs on an open-weight model that it selects; its site does not list models from OpenAI, Anthropic or Google.
Lumo
- The free plan limits Max model usage, messages, chat history, image generations and uploads, and allows 1 Project; Proton gives no exact numbers.
- The download menu lists iOS and Android apps and a web app; no desktop app is listed.
- Business use is sold separately, as Lumo Professional or as part of Proton Workspace.
Key features
Confer
- End-to-end encrypted history
- Chat history, folders, memories and attachments are encrypted with keys derived from a passkey, so the server stores only ciphertext. Recovery keys can unlock the data on your other devices.
- Private inference
- Prompts travel over an encrypted channel into a confidential VM. The client checks the hardware attestation against a public transparency log, and the code for that environment is published.
- Web search, images and file work
- Answers can draw on web search with sources and on attached photos and files, and Confer can create or edit documents, spreadsheets, presentations and images or run code.
- Memory you control
- Persistent memory carries context from one conversation to the next. You can review, edit and delete what it remembers, and import conversations from ChatGPT.
- Folders with files and instructions
- Folders group conversations, carry their own custom instructions and hold PDFs, Word documents, spreadsheets and other files that every chat in the folder can reference.
- Client-side connectors
- Connectors for Gmail, Google Drive and Google Calendar run on your device: access tokens are stored encrypted and the results do not pass through Confer's servers in readable form.
Lumo
- Zero-access encrypted chats
- Conversations are stored with zero-access encryption so that only you can read them; Proton says it cannot access them.
- No training on your chats
- Proton states that conversations are never used to train AI models, to target ads or to build a personal profile.
- Web search
- Built-in web search brings real-time information into answers. It is included in the free plan.
- Files and Proton Drive
- Link files and folders from Proton Drive to give Lumo context. The free plan uploads individual small files; Plus allows multiple large files.
- Image generation
- Turns a description into an image and lets you refine it through follow-up prompts.
- Open-source code
- Lumo's code is published as open source, which Proton says lets anyone verify that it is private and secure.
Plans
Confer
Free$0
Up to 5 chats at a time and a daily message limit. Attachments, connectors and custom instructions for folders are reserved for Members.
Confer Membership$34.99
in-app purchase on the US App Store; period not shown
Removes the cap on chats and adds attachments, connectors for Gmail, Google Calendar and Google Drive, and custom instructions for folders.
Lumo
Free$0
Limited Max model usage, messages, chat history and image generations, with 1 Project. No credit card required.
Lumo AI Plus$9.99
per month, billed yearly ($119.88); $12.99 billed monthly
More Max model usage, messages, chat history and image generations, unlimited Projects and Custom Lumos, with a 30-day money-back guarantee.
Ways to pay less
Confer
No public discounts listed.
Lumo
- Annual discount
23% off with yearly billing
Proton's pricing page lists Lumo AI Plus at $9.99 a month when billed yearly ($119.88 every 12 months) against $12.99 billed monthly, labeled as 23% off.
