The reality: A 200 OK on your homepage does not mean users can log in. The fix is a real-browser login monitor that signs in as a test user and asserts the post-login page rendered. Start for free. Login is the single page in your SaaS that breaks the most ways and shows up the least in standard monitoring. Your homepage and your marketing pages are static, cached, and boring. Your login page touches an auth provider, a session store, a CSRF token, a cookie domain, a redirect chain, and often a CAPTCHA. Any one of them can fail while the homepage stays green. Standard uptime monitors point at the homepage and report all clear. The first signal something broke is a support ticket from a frustrated user who cannot get in. This walks through what actually breaks in a SaaS login flow, how the major auth patterns fail, and how to set up a free browser login monitor that signs in as a real user every 15 minutes from the region of your choice and tells you the moment login stops working.…