Sentry is the error-monitoring platform UK engineering teams use to catch bugs in production before customers notice. It captures stack traces, session replays, and performance data across 100+ languages and frameworks, with alerting routed to Slack or PagerDuty. The free tier covers 5,000 errors/month; Team starts at $26/month. It's GDPR compliant with EU data residency options. Sentry integrates with GitHub, Vercel, and most CI pipelines. For UK startups it's the standard choice for observability — setup takes minutes and the time-to-first-value is immediate.
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