Privacy Policy

Last updated: October 23, 2026

This policy explains how Matter, operated by Eddie Wang (“we,” “us,” or “our”), handles personal information when you visit matter.work, download or use the Matter app, Matter Browser Control extension or Matter in Slack, or contact us.

Information we collect

• Account information. Your name, email address, profile image if provided, authentication information, and workspace memberships. If you sign in through another service, we receive the profile information that service shares with us.
• Workspace content. Tasks, notes, documents, messages, prompts, AI responses, files you upload, and other information you add to Matter. Shared content is stored on our servers and made available to people with access to the relevant workspace or space.
• Connected services. Connection details, authorization credentials, and information retrieved from or sent to services you connect, as needed to provide the features you use.
• Technical information. Requests to our website, servers, download service, and update service expose information such as IP address, request time, requested URL, and browser or app details to us and our hosting providers. These requests may be logged for operation, troubleshooting, and security. The website uses available device information to suggest a compatible download.
• Communications. Information you include when you contact us for support or send feedback.

Local data and AI features

The desktop app stores settings, caches, session information, and some agent data on your device. Matter is not an exclusively local service: account and workspace information is synchronized with our servers.

When you use AI features, prompts, conversation history, relevant workspace content, and tool results may be sent to the AI provider you use, such as OpenAI or Anthropic. Agents can also access files, websites, or connected services according to the tools and permissions available to them. Information they retrieve may become part of the conversation or be sent to the provider to complete your request.

Third-party AI and connected-service providers process information under their own terms and privacy policies. Their retention and model-training practices depend on the provider, account type, and settings. Do not submit information you are not authorized to share.

Matter Browser Control

The optional Chrome extension lets your Matter agents work in your browser. Before the first connection, the extension explains browser access and asks you to connect. Once connected, Matter can request the titles and URLs of open tabs to find tabs relevant to your request. In controlled tabs, it can read website content, take screenshots, navigate, and interact with pages using your existing signed-in sessions. Depending on the pages and actions you request, this can include personal information, communications, form entries, authentication information, financial or health information, and browsing activity.

The extension sends browser information to the Matter app through an authenticated connection on your computer. Matter can include this information in the conversation, synchronize it with our servers, and send it to your selected AI provider to perform your request. People with access to that conversation can see its contents. The extension does not independently send browser data to advertising or analytics services. It stores pairing credentials, your consent choice, and tab ownership information in Chrome’s local extension storage.

We use browser data only to provide the browser assistance you request and related operation and security. Matter’s use of information received through Chrome APIs complies with the Chrome Web Store User Data Policy, including its Limited Use requirements. We do not sell browser data, use it for personalized advertising or creditworthiness decisions, or transfer it to data brokers. Transfers are limited to providing the disclosed browser assistance, legal obligations, security and abuse prevention, or a business transfer with your prior explicit consent. Human access is limited to your explicit consent for specific data, aggregated and anonymized internal operations, security purposes, or legal obligations. These browser-data restrictions take precedence over the more general sharing provisions below.

Controlled tabs appear in labeled Matter tab groups. You can stop the agent in Matter, turn off Browser Use for your device, or disable or uninstall the extension in Chrome. Uninstalling the extension removes its local storage but does not delete browser information already included in Matter conversations or held by your AI provider. Conversation information follows the retention and deletion practices described below; contact privacy@matter.work for deletion requests, and consult your AI provider’s controls for information it holds.

Matter in Slack

When a Matter workspace adds Matter to a Slack workspace, we receive and store the Slack workspace’s name and ID, the app’s access token, and the scopes it was granted. To match Slack users to Matter members, we look up a Slack user’s name and confirmed email when they message Matter, and store which Slack user is which Matter member. If you connect a Slack account by signing in with Slack, we receive your Slack name, email and user ID.

Matter reads Slack messages only when a member sends them to Matter: messages in Matter’s direct messages, messages that mention @Matter, messages handed over with Send to Matter, and the answers to Matter’s questions. When someone mentions Matter in a thread, Matter also reads the thread’s earlier messages, which can include other people’s messages, as context for that member’s request. Files attached to those messages are copied into Matter. Messages from people who aren’t members of the connected Matter workspace are ignored: they pass through the delivery queue below and aren’t kept.

These messages, the context and files become part of the member’s conversation with their Matter assistant. They are stored and synchronized like other workspace content, and sent to the member’s AI provider to answer. Matter posts replies, and messages its members ask it to post, back to Slack. Matter doesn’t use Slack data to train AI models, sell it, or use it for advertising.

A received message is kept in a delivery queue until Matter has handled it, then cleared; delivery records are deleted after two days. Conversations stay in the member’s Matter until they or their workspace delete them. When Matter is removed from a Slack workspace, from Matter or from Slack, we delete its access token and the matched accounts. To delete information from Slack held in Matter, contact privacy@matter.work.

How we use information

We use information to provide and synchronize Matter, authenticate users, run AI and integration features, deliver downloads and updates, respond to support requests, troubleshoot problems, prevent abuse, and meet legal obligations.

Where applicable data protection law requires a legal basis, we rely on performing our agreement with you to provide the service; our legitimate interests in keeping the service reliable and secure and responding to requests; compliance with legal obligations; and consent where required. You may withdraw consent by contacting us, without affecting processing that occurred before withdrawal.

When information is shared

We share information with service providers that help operate Matter, including hosting, database, storage, authentication, AI, and integration providers. Our infrastructure includes Cloudflare for website and file delivery and PlanetScale for database hosting. Which AI and integration providers receive content depends on the features and connections you use.

Information may also be shared with collaborators according to workspace access, when you direct us to share it, when reasonably necessary to comply with law or protect rights and safety, or as part of a merger, acquisition, or transfer of the service subject to applicable privacy protections.

We do not sell personal information or share it for cross-context behavioral advertising.

Cookies and tracking

The download website does not use advertising cookies or third-party marketing analytics. Authentication services and the app may use cookies or local storage to maintain sessions and preferences. Third-party sites and connected services have their own practices.

We do not track visitors across unrelated websites for advertising. Our website does not change its behavior in response to a browser’s Do Not Track signal.

Retention and security

We retain account and workspace information while needed to provide the service. Retention also depends on whether content remains in a shared workspace, whether you request deletion, and whether information is needed for security, resolving disputes, or legal obligations. Logs, backups, and information held by third-party providers may have separate retention periods; deletion is not necessarily immediate in every copy.

We use safeguards designed to protect personal information, including access controls and encrypted network connections. No service or storage method can guarantee absolute security.

Your choices and rights

You can edit information and delete content where Matter provides those controls, and disconnect services you no longer want to use. Uninstalling the app does not delete your server-side account or shared workspace content.

Depending on where you live, you may have rights to access, correct, delete, or obtain a copy of your personal information, restrict or object to processing, and withdraw consent. Contact us to make a request. We may need to verify your identity and consider legal exceptions and other people’s rights. You may also complain to your local data protection authority. If your organization manages your workspace, contact its administrator about content it controls.

International processing

Matter and its providers may process information in the United States and other countries, whose privacy laws may differ from those where you live. Where required, international transfers must be covered by appropriate safeguards under applicable law.

Children

Matter is not directed to children under 13, and we do not knowingly collect their personal information. If you believe a child has provided personal information, contact us so we can investigate and address it.

Changes to this policy

We may update this policy as Matter changes. We will post the revised policy here and update the date above. For material changes, we will provide additional notice where required by law.

Contact

For privacy questions or requests to access or delete personal information, contact privacy@matter.work.