Privacy Policy

Last updated December 13, 2023

This privacy notice for Langfuse GmbH (doing business as Langfuse) (“we,” “us,” or “our”), describes how and why we might collect, store, use, and/or share (“process”) your information when you use our services (“Services”), such as when you:

• Visit our website at https://www.langfuse.com, or any website of ours that links to this privacy notice
• Engage with us in other related ways, including any sales, marketing, or events

Questions or concerns? Reading this privacy notice will help you understand your privacy rights and choices. If you do not agree with our policies and practices, please do not use our Services. If you still have any questions or concerns, please contact us at legal@langfuse.com.

Summary of Key Points

This summary provides key points from our privacy notice, but you can find out more details about any of these topics by clicking the link following each key point or by using our table of contents below to find the section you are looking for.

• What personal information do we process? When you visit, use, or navigate our Services, we may process personal information depending on how you interact with us and the Services, the choices you make, and the products and features you use. Learn more about personal information you disclose to us.
• Do we process any sensitive personal information? We do not process sensitive personal information.
• Do we receive any information from third parties? We do not receive any information from third parties.
• How do we process your information? We process your information to provide, improve, and administer our Services, communicate with you, for security and fraud prevention, and to comply with law. We may also process your information for other purposes with your consent. We process your information only when we have a valid legal reason to do so. Learn more about how we process your information.
• In what situations and with which parties do we share personal information? We may share information in specific situations and with specific third parties. Learn more about when and with whom we share your personal information.
• How do we keep your information safe? We have organizational and technical processes and procedures in place to protect your personal information. However, no electronic transmission over the internet or information storage technology can be guaranteed to be 100% secure, so we cannot promise or guarantee that hackers, cybercriminals, or other unauthorized third parties will not be able to defeat our security and improperly collect, access, steal, or modify your information. Learn more about how we keep your information safe.
• What are your rights? Depending on where you are located geographically, the applicable privacy law may mean you have certain rights regarding your personal information. Learn more about your privacy rights.
• How do you exercise your rights? The easiest way to exercise your rights is by submitting a data subject access request, or by contacting us. We will consider and act upon any request in accordance with applicable data protection laws.

Want to learn more about what we do with any information we collect? Review the privacy notice in full.

Table of Contents

1. What Information Do We Collect?
2. How Do We Process Your Information?
3. What Legal Bases Do We Rely on to Process Your Personal Information?
4. When and With Whom Do We Share Your Personal Information?
5. Do We Use Cookies and Other Tracking Technologies?
6. How Do We Handle Your Social Logins?
7. How Long Do We Keep Your Information?
8. How Do We Keep Your Information Safe?
9. Do We Collect Information From Minors?
10. What Are Your Privacy Rights?
11. Controls for Do-Not-Track Features
12. Do United States Residents Have Specific Privacy Rights?
13. Do We Make Updates to This Notice?
14. How Can You Contact Us About This Notice?
15. How Can You Review, Update, or Delete the Data We Collect From You?

1. What Information Do We Collect?

Personal information you disclose to us

We collect personal information that you voluntarily provide to us when you register on the Services, express an interest in obtaining information about us or our products and Services, when you participate in activities on the Services, or otherwise when you contact us.

Personal Information Provided by You. The personal information that we collect depends on the context of your interactions with us and the Services, the choices you make, and the products and features you use. The personal information we collect may include the following:

• names
• email addresses
• usernames
• passwords
• contact preferences
• billing addresses
• debit/credit card numbers
• phone numbers
• mailing addresses

Sensitive Information. We do not process sensitive information.

Payment Data. We may collect data necessary to process your payment if you make purchases, such as your payment instrument number, and the security code associated with your payment instrument. All payment data is stored by Stripe. You may find their privacy notice link(s) here: https://stripe.com/en-gb-de/privacy.

Social Media Login Data. We may provide you with the option to register with us using your existing social media account details, like your Facebook, Twitter, or other social media account. If you choose to register in this way, we will collect the information described in the section called “How Do We Handle Your Social Logins?” below.

All personal information that you provide to us must be true, complete, and accurate, and you must notify us of any changes to such personal information.

Information automatically collected

We automatically collect certain information when you visit, use, or navigate the Services. This information does not reveal your specific identity (like your name or contact information) but may include device and usage information, such as your IP address, browser and device characteristics, operating system, language preferences, referring URLs, device name, country, location, information about how and when you use our Services, and other technical information. This information is primarily needed to maintain the security and operation of our Services, and for our internal analytics and reporting purposes.

Like many businesses, we also collect information through cookies and similar technologies. You can find out more about this in our Cookie Notice: https://app.termly.io/document/cookie-policy/f97945a3-cb02-4db7-9370-c57023d92838.

The information we collect includes:

• Log and Usage Data. Log and usage data is service-related, diagnostic, usage, and performance information our servers automatically collect when you access or use our Services and which we record in log files. Depending on how you interact with us, this log data may include your IP address, device information, browser type, and settings and information about your activity in the Services (such as the date/time stamps associated with your usage, pages and files viewed, searches, and other actions you take such as which features you use), device event information (such as system activity, error reports (sometimes called “crash dumps”), and hardware settings).
• Device Data. We collect device data such as information about your computer, phone, tablet, or other device you use to access the Services. Depending on the device used, this device data may include information such as your IP address (or proxy server), device and application identification numbers, location, browser type, hardware model, Internet service provider and/or mobile carrier, operating system, and system configuration information.
• Location Data. We collect location data such as information about your device’s location, which can be either precise or imprecise. How much information we collect depends on the type and settings of the device you use to access the Services. For example, we may use GPS and other technologies to collect geolocation data that tells us your current location (based on your IP address). You can opt out of allowing us to collect this information either by refusing access to the information or by disabling your Location setting on your device. However, if you choose to opt out, you may not be able to use certain aspects of the Services.

2. How Do We Process Your Information?

We process your personal information for a variety of reasons, depending on how you interact with our Services, including:

• To facilitate account creation and authentication and otherwise manage user accounts. We may process your information so you can create and log in to your account, as well as keep your account in working order.
• To deliver and facilitate delivery of services to the user. We may process your information to provide you with the requested service.
• To respond to user inquiries/offer support to users. We may process your information to respond to your inquiries and solve any potential issues you might have with the requested service.
• To send administrative information to you. We may process your information to send you details about our products and services, changes to our terms and policies, and other similar information.
• To fulfill and manage your orders. We may process your information to fulfill and manage your orders, payments, returns, and exchanges made through the Services.
• To request feedback. We may process your information when necessary to request feedback and to contact you about your use of our Services.
• To protect our Services. We may process your information as part of our efforts to keep our Services safe and secure, including fraud monitoring and prevention.
• To identify usage trends. We may process information about how you use our Services to better understand how they are being used so we can improve them.
• To determine the effectiveness of our marketing and promotional campaigns. We may process your information to better understand how to provide marketing and promotional campaigns that are most relevant to you.
• To save or protect an individual’s vital interest. We may process your information when necessary to save or protect an individual’s vital interest, such as to prevent harm.

3. What Legal Bases Do We Rely on to Process Your Personal Information?

If you are located in the EU or UK, this section applies to you.

The General Data Protection Regulation (GDPR) and UK GDPR require us to explain the valid legal bases we rely on in order to process your personal information. As such, we may rely on the following legal bases to process your personal information:

• Consent. We may process your information if you have given us permission (i.e., consent) to use your personal information for a specific purpose. You can withdraw your consent at any time. Learn more about withdrawing your consent.
• Performance of a Contract. We may process your personal information when we believe it is necessary to fulfill our contractual obligations to you, including providing our Services or at your request prior to entering into a contract with you.
• Legitimate Interests. We may process your information when we believe it is reasonably necessary to achieve our legitimate business interests and those interests do not outweigh your interests and fundamental rights and freedoms. For example, we may process your personal information for some of the purposes described in order to:
• Analyze how our Services are used so we can improve them to engage and retain users
• Support our marketing activities
• Diagnose problems and/or prevent fraudulent activities
• Understand how our users use our products and services so we can improve user experience
• Legal Obligations. We may process your information where we believe it is necessary for compliance with our legal obligations, such as to cooperate with a law enforcement body or regulatory agency, exercise or defend our legal rights, or disclose your information as evidence in litigation in which we are involved.
• Vital Interests. We may process your information where we believe it is necessary to protect your vital interests or the vital interests of a third party, such as situations involving potential threats to the safety of any person.

In legal terms, we are generally the “data controller” under European data protection laws of the personal information described in this privacy notice, since we determine the means and/or purposes of the data processing we perform. This privacy notice does not apply to the personal information we process as a “data processor” on behalf of our customers. In those situations, the customer that we provide services to and with whom we have entered into a data processing agreement is the “data controller” responsible for your personal information, and we merely process your information on their behalf in accordance with your instructions. If you want to know more about our customers’ privacy practices, you should read their privacy policies and direct any questions you have to them.

If you are located in Canada, this section applies to you.

We may process your information if you have given us specific permission (i.e., express consent) to use your personal information for a specific purpose, or in situations where your permission can be inferred (i.e., implied consent). You can withdraw your consent at any time.

In some exceptional cases, we may be legally permitted under applicable law to process your information without your consent, including, for example:

• If collection is clearly in the interests of an individual and consent cannot be obtained in a timely way
• For investigations and fraud detection and prevention
• For business transactions provided certain conditions are met
• If it is contained in a witness statement and the collection is necessary to assess, process, or settle an insurance claim
• For identifying injured, ill, or deceased persons and communicating with next of kin
• If we have reasonable grounds to believe an individual has been, is, or may be victim of financial abuse
• If it is reasonable to expect collection and use with consent would compromise the availability or the accuracy of the information and the collection is reasonable for purposes related to investigating a breach of an agreement or a contravention of the laws of Canada or a province
• If disclosure is required to comply with a subpoena, warrant, court order, or rules of the court relating to the production of records
• If it was produced by an individual in the course of their employment, business, or profession and the collection is consistent with the purposes for which the information was produced
• If the collection is solely for journalistic, artistic, or literary purposes
• If the information is publicly available and is specified by the regulations

4. When and With Whom Do We Share Your Personal Information?

Vendors, Consultants, and Other Third-Party Service Providers

We may share your data with third-party vendors, service providers, contractors, or agents (“third parties”) who perform services for us or on our behalf and require access to such information to do that work. We have contracts in place with our third parties, which are designed to help safeguard your personal information. This means that they cannot do anything with your personal information unless we have instructed them to do it. They will also not share your personal information with any organization apart from us. They also commit to protect the data they hold on our behalf and to retain it for the period we instruct. The third parties we may share personal information with are as follows:

• Advertising, Direct Marketing, and Lead Generation
  • HubSpot
  • Loops
• Allow Users to Connect to Their Third-Party Accounts
  • Google account, GitHub, AzureAD
• Cloud Computing Services
  • Supabase
  • Vercel
  • Google Cloud Platform
  • AWS
• Communicate and Chat with Users
  • Slack
  • Crisp Chat
• Invoice and Billing
  • Stripe
• Product metrics
  • Posthog, Inc.
• Application logging for internal use
  • BetterStack, Inc.
• Application monitoring for internal use
  • Functional Software, Inc. d/b/a Sentry
  • Datadog, Inc.

We also may need to share your personal information in the following situations:

• Business Transfers. We may share or transfer your information in connection with, or during negotiations of, any merger, sale of company assets, financing, or acquisition of all or a portion of our business to another company.

5. Do We Use Cookies and Other Tracking Technologies?

We may use cookies and similar tracking technologies (like web beacons and pixels) to access or store information. Specific information about how we use such technologies and how you can refuse certain cookies is set out in our Cookie Notice: https://app.termly.io/document/cookie-policy/f97945a3-cb02-4db7-9370-c57023d92838.

6. How Do We Handle Your Social Logins?

Our Services offer you the ability to register and log in using your third-party social media account details (like your Facebook or Twitter logins). Where you choose to do this, we will receive certain profile information about you from your social media provider. The profile information we receive may vary depending on the social media provider concerned, but will often include your name, email address, friends list, and profile picture, as well as other information you choose to make public on such a social media platform.

We will use the information we receive only for the purposes that are described in this privacy notice or that are otherwise made clear to you on the relevant Services. Please note that we do not control, and are not responsible for, other uses of your personal information by your third-party social media provider. We recommend that you review their privacy notice to understand how they collect, use, and share your personal information, and how you can set your privacy preferences on their sites and apps.

7. How Long Do We Keep Your Information?

We will only keep your personal information for as long as it is necessary for the purposes set out in this privacy notice, unless a longer retention period is required or permitted by law (such as tax, accounting, or other legal requirements). No purpose in this notice will require us keeping your personal information for longer than one (1) month past the termination of the user’s account.

When we have no ongoing legitimate business need to process your personal information, we will either delete or anonymize such information, or, if this is not possible (for example, because your personal information has been stored in backup archives), then we will securely store your personal information and isolate it from any further processing until deletion is possible.

8. How Do We Keep Your Information Safe?

We have implemented appropriate and reasonable technical and organizational security measures designed to protect the security of any personal information we process. However, despite our safeguards and efforts to secure your information, no electronic transmission over the Internet or information storage technology can be guaranteed to be 100% secure, so we cannot promise or guarantee that hackers, cybercriminals, or other unauthorized third parties will not be able to defeat our security and improperly collect, access, steal, or modify your information. Although we will do our best to protect your personal information, transmission of personal information to and from our Services is at your own risk. You should only access the Services within a secure environment.

9. Do We Collect Information From Minors?

We do not knowingly solicit data from or market to children under 18 years of age. By using the Services, you represent that you are at least 18 or that you are the parent or guardian of such a minor and consent to such minor dependent’s use of the Services. If we learn that personal information from users less than 18 years of age has been collected, we will deactivate the account and take reasonable measures to promptly delete such data from our records. If you become aware of any data we may have collected from children under age 18, please contact us at legal@langfuse.com.

10. What Are Your Privacy Rights?

In some regions (like the EEA, UK, Switzerland, and Canada), you have certain rights under applicable data protection laws. These may include the right (i) to request access and obtain a copy of your personal information, (ii) to request rectification or erasure; (iii) to restrict the processing of your personal information; (iv) if applicable, to data portability; and (v) not to be subject to automated decision-making. In certain circumstances, you may also have the right to object to the processing of your personal information. You can make such a request by contacting us by using the contact details provided in the section “How Can You Contact Us About This Notice?” below.

We will consider and act upon any request in accordance with applicable data protection laws.

If you are located in the EEA or UK and you believe we are unlawfully processing your personal information, you also have the right to complain to your Member State data protection authority or UK data protection authority.

If you are located in Switzerland, you may contact the Federal Data Protection and Information Commissioner.

Withdrawing your consent:

If we are relying on your consent to process your personal information, which may be express and/or implied consent depending on the applicable law, you have the right to withdraw your consent at any time. You can withdraw your consent at any time by contacting us by using the contact details provided in the section “How Can You Contact Us About This Notice?” below or updating your preferences.

However, please note that this will not affect the lawfulness of the processing before its withdrawal nor, when applicable law allows, will it affect the processing of your personal information conducted in reliance on lawful processing grounds other than consent.

Opting out of marketing and promotional communications:

You can unsubscribe from our marketing and promotional communications at any time by clicking on the unsubscribe link in the emails that we send, or by contacting us using the details provided in the section “How Can You Contact Us About This Notice?” below. You will then be removed from the marketing lists. However, we may still communicate with you — for example, to send you service-related messages that are necessary for the administration and use of your account, to respond to service requests, or for other non-marketing purposes.

Account Information

If you would at any time like to review or change the information in your account or terminate your account, you can:

• Log in to your account settings and update your user account.
• Contact us using the contact information provided.

Upon your request to terminate your account, we will deactivate or delete your account and information from our active databases. However, we may retain some information in our files to prevent fraud, troubleshoot problems, assist with any investigations, enforce our legal terms and/or comply with applicable legal requirements.

Cookies and similar technologies:

Most Web browsers are set to accept cookies by default. If you prefer, you can usually choose to set your browser to remove cookies and to reject cookies. If you choose to remove cookies or reject cookies, this could affect certain features or services of our Services. For further information, please see our Cookie Notice: https://app.termly.io/document/cookie-policy/f97945a3-cb02-4db7-9370-c57023d92838.

If you have questions or comments about your privacy rights, you may email us at legal@langfuse.com.

11. Controls for Do-Not-Track Features

Most web browsers and some mobile operating systems and mobile applications include a Do-Not-Track (“DNT”) feature or setting you can activate to signal your privacy preference not to have data about your online browsing activities monitored and collected. At this stage no uniform technology standard for recognizing and implementing DNT signals has been finalized. As such, we do not currently respond to DNT browser signals or any other mechanism that automatically communicates your choice not to be tracked online. If a standard for online tracking is adopted that we must follow in the future, we will inform you about that practice in a revised version of this privacy notice.

12. Do United States Residents Have Specific Privacy Rights?

What categories of personal information do we collect?

We have collected the following categories of personal information in the past twelve (12) months:

We will use and retain the collected personal information as needed to provide the Services or for:

• Category A - As long as the user has an account with us
• Category B - As long as the user has an account with us
• Category C - As long as the user has an account with us
• Category F - As long as the user has an account with us
• Category H - As long as the user has an account with us
• Category I - As long as the user has an account with us

We may also collect other personal information outside of these categories through instances where you interact with us in person, online, or by phone or mail in the context of:

• Receiving help through our customer support channels;
• Participation in customer surveys or contests; and
• Facilitation in the delivery of our Services and to respond to your inquiries.

How do we use and share your personal information?

Learn about how we use your personal information in the section, “How Do We Process Your Information?”.

We collect and share your personal information through:

• Targeting cookies/Marketing cookies
• Beacons/Pixels/Tags

Will your information be shared with anyone else?

We may disclose your personal information with our service providers pursuant to a written contract between us and each service provider. Learn more about how we disclose personal information to in the section, “When and With Whom Do We Share Your Personal Information?”.

We may use your personal information for our own business purposes, such as for undertaking internal research for technological development and demonstration. This is not considered to be “selling” of your personal information.

We have not sold or shared any personal information to third parties for a business or commercial purpose in the preceding twelve (12) months. We have disclosed the following categories of personal information to third parties for a business or commercial purpose in the preceding twelve (12) months:

• Category A. Identifiers

The categories of third parties to whom we disclosed personal information for a business or commercial purpose can be found under “When and With Whom Do We Share Your Personal Information?“.

13. Do We Make Updates to This Notice?

We may update this privacy notice from time to time. The updated version will be indicated by an updated “Revised” date and the updated version will be effective as soon as it is accessible. If we make material changes to this privacy notice, we may notify you either by prominently posting a notice of such changes or by directly sending you a notification. We encourage you to review this privacy notice frequently to be informed of how we are protecting your information.

14. How Can You Contact Us About This Notice?

If you have questions or comments about this notice, you may email us at legal@langfuse.com or contact us by post at:

Langfuse GmbH
Gethsemanestraße 4 c/o Deichmann, 10437 Berlin, Germany
Berlin, Berlin 10437
Germany

If you are a resident in the European Economic Area, we are the “data controller” of your personal information. We have appointed Langfuse GmbH to be our representative in the EEA. You can contact them directly regarding our processing of your information, by email at legal@langfuse.com, by visiting https://langfuse.com, by phone at +49 0152 08459573, or by post to:

Langfuse GmbH c/o Deichmann
Gethsemanestr. 4
Berlin, Berlin 10437
Germany

15. How Can You Review, Update, or Delete the Data We Collect From You?

Based on the applicable laws of your country, you may have the right to request access to the personal information we collect from you, change that information, or delete it. To request to review, update, or delete your personal information, please fill out and submit a data subject access request.