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Sentry is a mature, dev-first error tracker. Greenslope is Auto-SRE for small teams — release-aware observability with a full incident loop. Both are good products. The question is which shape of problem you're solving.
This page is a positioning narrative, not a feature matrix. It should help you self-select — the right customers pick Greenslope, the right customers pick Sentry, both leave respecting the other.
Sentry, on its own terms.
Sentry is the industry-standard error tracker. It catches exceptions, groups them, attaches breadcrumbs and session context, and surfaces regressions across releases. It has broad language and framework coverage and a generous free tier. Over the last few years it has grown into performance monitoring and session replay too.
Its centre of gravity is still: a developer landing on a bug report, seeing the stack trace, and understanding why the error happened. It’s excellent at that.
When we'd tell you to pick Sentry.
We'd rather you pick the right tool and trust us than adopt Greenslope for a job it isn't the right shape for.
- Your primary reliability artifact is individual exceptions, not system-level degradation across endpoints.
- You want broad language SDK coverage — Rust, Elixir, Kotlin, Swift — where OTel maturity varies.
- Session replay is a first-class requirement for your team's debugging loop.
- You already have a functioning paging and on-call stack; you just need good error telemetry.
- Your team has the SRE discipline to turn errors into reliability practice on its own.
When Greenslope is the better shape of tool.
Greenslope is Auto-SRE for small, shipping-fast engineering teams. If this is you, keep reading.
- You ship on Vercel, Cloudflare, Fly, or similar PaaS and feel the pain of release-driven incidents.
- You want answers, not just alerts — a triage summary tells you what happened, not just that something happened.
- You want traces on day one, not errors plus a separate "add performance" upsell.
- You don't have a dedicated SRE and don't want to hire one before production matters.
- You want the alert → triage → rollback → postmortem loop closed, not four tools stitched together.
- You want EU data residency by default, UK-registered entity, and no US-default posture.
Non-goals — on purpose.
Every product is a set of choices. Here's what we've deliberately decided not to compete on.
Broad SDK matrix
Sentry maintains its own per-language SDKs across dozens of runtimes. Greenslope is OTel-only — anything OTel-compatible works on day one, but we deliberately don't maintain bespoke SDKs.
Session replay
Sentry has it. Greenslope is server-side observability only; frontend RUM and session replay are explicit non-goals.
Free tier
Sentry has a large free tier. Greenslope offers a 14-day, no-credit-card trial but no permanent free tier. Our paid plans are cheaper than most Sentry-Team equivalents at the volumes we serve.
Error-grouping sophistication
Sentry has years of investment in error fingerprinting and release regression detection. We correlate anomalies to releases from traces; if you want deep exception-grouping specifically, Sentry is better.
They aren't always either/or.
Many teams use both. Sentry for exception-level debugging in the IDE flow, Greenslope for incident-level triage and postmortems. You get the stack trace in one tool and the system-wide picture in the other.
Teams that eventually consolidate tend to move from Sentry-only to Greenslope-only as trace-first observability and the closed incident loop cover most of what they were using Sentry for. If you’re weighing that path: try Greenslope for 14 days alongside Sentry. You’ll know within the first real incident whether it replaces the loop for you.
Next step
Try Greenslope free for 14 days. No credit card. You’ll see your first trace within five minutes of finishing setup.