X Legal Campaign Shuts Down Nitter and XCancel

SAN FRANCISCO — X Corp.’s campaign against unauthorized data scraping and third-party front-ends has taken down major open-source tools that let people view public posts on X without logging in or being tracked. The company is owned by billionaire Elon Musk.

Nitter, created in 2019 as a lightweight, open-source alternative front-end for Twitter, now X, was designed to strip out client-side JavaScript, telemetry, advertisements, and tracking cookies. It allowed non-registered users to read public posts and generate RSS feeds without creating an account or contributing to the platform’s monetizable active user metrics.

Third-party mirror sites, including XCancel, used Nitter’s software architecture to provide indirect access to public posts. XCancel later announced on its homepage, “Due to a new development in the ongoing legal proceedings, the service is suspended,” adding, “We can’t share more details.”

The immediate suspension followed legal pressure from X Corp. In August, the company sent Nitter a cease-and-desist notice alleging “unlawful use and circumvention of X’s Application Programming Interface (API) and associated data.” The notice said Nitter and related services violated platform terms by scraping content and bypassing authentication controls intended to protect site data.

Both Nitter and XCancel briefly halted operations after receiving the letter in August, then resumed service in early September. They went offline again after X Corp. took further legal steps. On Sept. 11, Nitter’s primary code repository on GitHub was placed in read-only mode and archived, preventing additional code updates to the open-source project. XCancel subsequently posted its notice suspending operations immediately.

The platforms had already faced technical obstacles before the latest legal action. To bypass API paywalls, Nitter historically used web scraping and automated session tokens, known as guest tokens, generated by X’s servers for unauthenticated visitors. In July 2023, X introduced login requirements and daily rate limits on post viewing to stop unauthorized web crawlers from scraping platform content.

By January 2024, X had completely disabled the public guest token generation mechanism, disrupting Nitter instances worldwide before the legal demands were delivered. X Corp. also updated its Terms of Service in August 2023 to expressly prohibit automated scraping, data extraction, and crawling without prior written permission. The company cited unauthorized data collection for artificial intelligence training models and server overload from automated traffic.

The broader restrictions followed Musk’s $44 billion acquisition of Twitter in October 2022. Since taking ownership, Musk has overseen systematic changes aimed at limiting data access by non-paying third parties and automated systems. In February 2023, X terminated free public access to its Application Programming Interfaces (v1.1 and v2).

The company replaced the free tiers with paid plans starting at $100 per month for basic access and reaching $42,000 per month for enterprise-level data streams. That change forced long-standing third-party client applications, including Tweetbot and Twitterrific, to close permanently.