Every few months, a popular tool that used to work without an account quietly adds a login wall. Postman did it. Figma tightened its free tier. Notion started blocking exports. The pattern is consistent: tools get funding, growth targets appear, and suddenly "free" means "free with an account we can market to." Open source browser tools break this cycle structurally. Not as a policy, not as a promise — structurally. When the code is public and runs in your browser, there's nothing to log in to, no server-side session to create, and no business model that requires knowing who you are. The distinction matters. A proprietary tool that skips signup today can add one tomorrow. An open source tool where encryption happens in JavaScript you can read cannot quietly start logging your keystrokes without someone noticing. Why Open Source and No-Login Go Together The login requirement almost always serves a business purpose. Account creation enables email marketing. Session tracking enables behavioral analytics.…