SQRL – Anti-spam rules language Twitter acquired in 2018, open-sourced
Hey all, author here! This is a demo of the rules engine we built to fight spam/abuse on the internet. It was built based on learnings from Facebook & Google, while trying to make a language that makes it simple for anti-spam analysts to quickly (and safely) deploy rules to production. Unfortunately it looks like the Twitter event feed is temporarily down (they're blocking it, possibly as part of shutting down the API on Thursday). I have a cache of events from a little earlier that I'm going to try play through the stream.
SQRL – Anti-spam rules language Twitter acquired in 2018, open-sourced launched on February 6, 2023 with 200 votes, #167 of 3,829 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 3 years on.
In plain words
SQRL is an open-source rules language for detecting and preventing spam and abuse online. Originally developed by Twitter and based on approaches used by Facebook and Google, it enables anti-spam analysts to create and deploy detection rules to production quickly and safely. The tool is designed for developers and security teams working on content moderation.
written from the facts on this page · September 2026
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