Mixpanel

User signal (79 comments; top 25 shown, nearly all HackerNews) is dominated by a security incident: Mixpanel detected a smishing campaign that led to unauthorized access, and OpenAI — which used Mixpanel for frontend web analytics on platform.openai.com — notified API users and publicly stated 'After reviewing this incident, OpenAI has terminated its use of Mixpanel.' Users heavily criticize Mixpanel's own disclosure as vague: no detail on what systems were accessed, what data was exposed, timeline, or scale. One commenter calls it 'a textbook example of how not to handle this situation'; another says the passive framing ('a recent security incident') feels 'dismissive and inhuman.' A former customer reports receiving the notification email months after closing their account, raising data-retention questions (companies 'tend to hang on to all kinds of data'). Privacy mechanics drew scrutiny: Mixpanel tags users with a device ID, then back-ports your internal customer ID once they convert, so it holds identified user-journey data — 'suspect' to one commenter, and a driver of GDPR-driven churn. Pricing is a recurring complaint: one startup user says the free package jumped to '$x,000 per month' after expiry (though Mixpanel later changed pricing); another calls it 'the most obscure pricing model of any SAAS,' claiming a paid upgrade actually DOWNGRADED them from 20M to 10K events/month, prompting immediate cancellation. Many threads show users actively evaluating alternatives (Plausible, PostHog, Umami, OpenPanel, UXWizz) over privacy and cost. Positives are sparse but real: Mixpanel's docs are cited approvingly for group analytics in B2B SaaS ('it's a lot more important to understand which customers are using which features, not which users').

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