Privacy Policy

Last Updated: December 29, 2025

Overview

Experimentation Local Interface (ELI) is a local development tool that helps developers create and test web experiments. This privacy policy explains how the extension handles your data.

Data Collection

ELI does not collect, transmit, or store any personal data or browsing information.

Local Storage Only

The extension uses Chrome's local storage API to store the following preferences locally on your device:

• Selected project and variant
• Auto-inject preference
• Projects directory path

This data is stored locally in your browser and is never transmitted to any external server or service.

Local Development Server

ELI communicates with a local development server running on http://localhost:8000 on your machine. This communication:

• Only occurs on your local machine
• Never transmits data to external servers
• Is used solely to fetch your local project files

Permissions

ELI requires the following permissions:

• scripting: To inject your experiment scripts into web pages for testing
• activeTab: To access the current tab for script injection
• tabs: To reload pages and manage tabs during development
• storage: To save your preferences locally
• <all_urls>: To allow script injection on any website you're testing
• http://localhost:8000/*: To communicate with your local development server

These permissions are required for the extension's core functionality and are not used to collect or transmit any data.

Third-Party Services

ELI does not use any third-party analytics, tracking, or data collection services.

Contact

If you have questions about this privacy policy, please contact us through the extension's GitHub repository.

Changes to This Policy

We may update this privacy policy from time to time. The "Last Updated" date at the top of this policy will reflect any changes.