Google has discontinued Project Mariner, an experimental web automation tool that was designed to perform tasks for users across different websites. The shutdown was completed on May 4th, 2026, according to a message now displayed on the Project Mariner landing page.

Project Mariner was part of Google's experimental features program, aimed at exploring new ways for artificial intelligence to interact with web-based applications and services on behalf of users. The tool represented Google's efforts to develop more sophisticated AI agents capable of navigating and performing actions across various online platforms.

The landing page for Project Mariner now displays a brief message thanking users for their participation in the experimental program and confirming the May 4th shutdown date. No specific reasons were provided for the discontinuation of the service.

The closure of Project Mariner reflects the experimental nature of many AI-powered tools currently being developed by major technology companies. Such pilot programs often serve as testing grounds for new technologies before companies decide whether to integrate them into broader product offerings or discontinue them based on performance and user adoption metrics.