Privacy Policy

Last updated: January 5, 2026

Introduction

This privacy policy explains how Lune Inc. ("Endstack," "we," or "us") collects, uses, and protects your information when you use our website (Endstack.com) and services. This policy applies to all users of our products and services and should be read in conjunction with our Terms of service ("Terms"), which contain additional important information about how we handle your data and content.

Data Collection and Use

Information We Collect

• Account Information
• Email address
• Name
• Payment information for paid plans
• Account preferences and settings

For detailed information about account management and your responsibilities regarding account information, please see the "User accounts and content" section of our Terms.

Service Usage Data

If during onboarding you opt into "Help improve Endstack", we may use the following obfuscated and anonymized data to improve our services:

• Generated autocomplete suggestion content
• Accepted and denied autocomplete suggestion feedback

This is completely optional, and all data collected is anonymized.

The following data will be collected for all users:

• Autocomplete suggestion acceptance rate

No Google Gmail API data is ever directly collected and stored for this purpose.

For detailed information about data usage, training, and learning, please see the "Data usage, training, and learning" section of our Terms.

Third Party Integrations

Endstack requests the googleapis.com/auth/gmail.readonly scope in order to get read only access your emails.

Your email data is only processed once during onboarding, in order to improve the quality of autocomplete suggestions. This data is never stored in our servers.

Cloud and Local Storage

Computer usage data that is periodically extracted for autocomplete suggestion generation will never be stored or logged in our servers. The only time it leaves your device is during autocomplete suggestion generation, when parts of this data is included in the context for autocomplete suggestion generation, where it will be securely routed through our servers directly to Google.

For detailed information about how Google handles API request data, see their Privacy policy.

Automatically Collected Information

• IP addresses
• Browser type and version
• Device information
• Operating system
• Access times and dates
• Pages visited

Analytics and Tracking

We use the following analytics and tracking tools:

• Vercel Analytics
  • We use Vercel Analytics for product analytics and user behavior tracking
  • For details about Vercel Analytics's data handling, please see their Privacy policy

Cookies and Tracking Technologies

We use cookies and similar tracking technologies to:

• Maintain your session
• Remember your preferences
• Analyze product usage
• Improve our services
• You can control cookie preferences through your browser settings.

How We use Your Information

We use collected information as detailed in our Terms of service (see "Data usage, training, and learning" section) for the following purposes:

Provide and improve our services, including:

• Product functionality improvements
• Service quality enhancements

Support and Operations:

• Provide customer support
• Process payments
• Send service updates

Security and Maintenance

• Maintain product security
• Analyze usage patterns
• Debug technical issues
• Prevent abuse and fraud

Google Gmail API data is never stored or logged in our servers and stays completely on your local machine. We do not use your email data for any AI training purposes ever.

For complete details about our data usage practices, please refer to the "Data usage, training, and learning" section in our Terms of service at endstack.com/terms.

Data Sharing and Processing

Third-party Service Providers We share data with trusted service providers as outlined in our Terms. For specific information about:

• Data processing practices
• Enterprise plan protections
• Service provider requirements
• Custom handling agreements

Please see the "Data usage, training, and learning" section of our Terms.

Your Rights

You have the right to:

• Access your personal data
• Request data correction
• Request data deletion
• Export your data
• Opt out of certain processing
• Withdraw consent

Contact support@endstack.com to exercise these rights.

Security Measures

We implement industry-standard security measures:

• Encrypted data transmission
• Secure data storage
• Access controls
• Regular security audits

As detailed in the "Data usage, training, and learning" section of our Terms, we may use certain data to improve our services and train our AI systems. Important exceptions and limitations apply.

Please refer to our Terms for complete information about:

• Types of data used for training
• Enterprise plan exceptions
• Data handling practices
• Your rights regarding data usage

No Google Gmail API data is ever used for training and learning purposes, nor is it ever directly stored or logged in our servers. See our Terms for more details.

Data Protection and Security

Our security measures and data protection practices complement the warranty disclaimers and liability limitations detailed in our Terms. For specific information about:

• Product security
• Data handling
• Risk allocation
• Liability limitations

Please see the "Disclaimer of warranties" and "Limitation of liability" sections in our Terms.

User Content Visibility

The autocomplete suggestions that are generated using our services are private and only accessible to you and Endstack's authorized employees, contractors, and partners as necessary to provide support and maintain product functionality.

Liability Protections

Our product includes technical measures to protect the privacy and security of user content. However, we cannot be held liable for any issues that may arise from users deliberately circumventing our product limitations or protections to access private content.

Users are responsible for maintaining the confidentiality of their account information and for any activities that occur under their account, whether or not authorized by the user. We disclaim all liability for any damages, loss of profits, or other harm resulting from unauthorized access to user content.

Our warranty disclaimers and liability limitations, as detailed in our Terms of Service, apply to all aspects of our product and services, including the security and privacy of user data.

Children's Privacy

Our services are not intended for users under 18. We do not knowingly collect data from children.

International Data Transfers

We may transfer data internationally within our service provider network. We ensure appropriate safeguards are in place for these transfers.

Legal Framework

This privacy policy is part of and subject to our Terms. In case of any conflict between this privacy policy and our Terms, the Terms shall prevail.

Changes to This Policy

We may update this policy periodically. Changes will be handled in accordance with the process outlined in our Terms regarding policy updates.

Contact Details

General Contact Information:

Company name: Lune Inc.

Email: support@endstack.com

Website: https://endstack.com

Contact Us For

Privacy questions: support@endstack.com

Support: support@endstack.com

DMCA and legal issues: support@endstack.com

General feedback: support@endstack.com

Response Times

We aim to respond to privacy-related inquiries within 7 business days

For urgent matters related to data protection or security incidents, please mark your email as "URGENT - Privacy concern"

Additional Resources

Terms of service: https://endstack.com/terms

For the fastest response, please use the appropriate email address for your inquiry and include relevant account information when contacting us.