Promote Sign in Sign up

Personal assistant 2026 Rank: #1391

Lumo by Proton ✓

AI that talks with you, not about you.

Source rating 5.0 (2) 1.6k views 79.7M/mo traffic 5 saves Freemium
Data Security No Data Harvesting No-third-party-sharing
More categories (4)
Privacy-Focused Zero Access Encryption Adherence To GDPR Personal assistant
Visit website Sign in to save

Free + from $9.99/mo

Privacy Terms

Verdict

A quick read before you dig into the full page.

Best if
AI that talks with you, not about you
Skip if
Swiss ownership could limit service availability
Pick this when
Privacy-focused

Considering Notis instead? Compare side by side

Overview

Lumo is a privacy-focused AI assistant developed by Proton. Distinguished by its commitment to data privacy and security, Lumo ensures that all chat conversations remain confidential and are not tracked or recorded.

Furthermore, it does not retain any user data on its servers. This aim is achieved through zero-access encryption, meaning user conversations can only be decoded and read on the originating device and are invisible to all other entities, including Proton.

Lumo embodies transparency and trustworthiness; its code is fully open source, allowing independent verification of its private and secure nature. Moreover, it assures that user data will not be used for training the model.

This privacy-centric AI assistant gives its users full control over their data, promising not to share it with third parties such as advertisers or governments.

Adherence to GDPR is guaranteed as Lumo is a European service, with provisions for users to delete their data anytime. Lumo is a creation of the team behind privacy-first services like Proton Mail and Proton VPN, and is owned by a Swiss nonprofit.

Unlike most Big Tech AI, Lumo does not base its functionality on data harvesting, steadfastly valuing user privacy over profit.

Lumo by Proton website

Access & connections

Where you can use Lumo by Proton.

Platforms

Web

Capabilities

What this tool accepts, produces, and is strongest at.

Input

  • Text

Output

  • Text

Pros & cons

Pros

  • Privacy-focused
  • Emphasizes data security
  • Confidential chat conversations
  • Zero-access encryption
  • User data not retained
  • Open source code
  • Allows data control
  • No training with user data
Show 8 more
  • Guaranteed GDPR adherence
  • Allows user data deletion
  • Proton foundation
  • Committed to trustworthiness
  • No third-party data sharing
  • Swiss nonprofit ownership
  • No data harvesting
  • Operates with privacy over profit

Cons

  • Requires JavaScript to run
  • Unable to use user data for model improvement
  • Possibly limited functionality due to privacy focus
  • Data not shared for potential benefits
  • Dependent on user device for data decode
  • User data deletion could affect service experience
  • No third-party integrations due to privacy policy
  • May be less advanced due to no data harvesting
Show 2 more
  • Full user data control may be overwhelming for some
  • Swiss ownership could limit service availability

Compare alternatives

Similar tools in the catalog — with a clear reason to open each one.

Free + from $13/mo

Full comparison

Why look Typically cheaper

Full comparison

Free + from $17/mo

Full comparison

Why look Typically cheaper

Full comparison

Free + from $20/mo

Full comparison

Free + from $15

Full comparison

Releases 1

Initial release July 13, 2026 Current
Initial release of Lumo by Proton.

FAQ 12

What is Lumo by Proton?
Lumo is a privacy-focused AI assistant developed by Proton. It is designed to ensure a high degree of data privacy and security, without tracking or recording chat conversations.
How does Lumo ensure data privacy and security?
Lumo ensures data privacy and security through a principle known as zero-access encryption. This means that all chat conversations can only be decoded and read on the originating device and remain invisible to all other entities, including Proton. Lumo does not retain any user data on its servers, ensuring that all chat conversations can't be seen, shared, or used to profile users.
What is zero-access encryption and how does Lumo utilize it?
Zero-access encryption is a form of encryption where the encrypted data can only be decoded and read on the originating device. Lumo utilizes this to ensure that your saved conversations remain private and secure. Neither Proton nor anyone else can decode or read them.
Why does Lumo claim to be trustworthy?
Lumo is considered trustworthy due to its commitment to transparency. Its code is fully open source, allowing any person to independently verify its privacy and security features. Furthermore, Lumo assures that it will not use user data for training its model.
Is Lumo's code open source?
Yes, Lumo's code is fully open source. This allows anyone to independently verify its private and secure nature.
Why won't Lumo use my data for training its model?
Lumo won't use your data for training its model as part of its commitment to privacy and data security. Lumo ensures that user data is not utilized in a way that could compromise user confidentiality or privacy.
How does Lumo give control of data to the users?
Lumo gives control of data to the users by ensuring that their data is not shared with third parties such as advertisers or governments. It also adheres to GDPR, allowing users to delete their data anytime.
Does Lumo share user data with third parties?
No, Lumo does not share user data with third parties. This includes advertisers, governments, or any other entities.
How does Lumo adhere to GDPR?
Lumo adheres to GDPR as it is a European service. It gives users the right to control their data, including the ability to delete their data at any time.
How can I delete my data from Lumo?
You can delete your data from Lumo at any time, thanks to its adherence to GDPR regulations. This is a part of the data control Lumo offers its users.
What/who is the team behind Lumo?
Lumo is created by the team behind privacy-first services Proton Mail and Proton VPN. It is owned by a Swiss nonprofit dedicated to advancing privacy and not making money from user data.
Why does Lumo not base its functionality on data harvesting?
Lumo does not base its functionality on data harvesting in order to uphold its commitment to user privacy and security. Unlike Big Tech AI, Lumo prioritizes user privacy rather than profiting from user data.
Lumo by Proton Free + from $9.99/mo
Visit website