Understand your Node.js applications with confidence.
From runtime behavior to retained objects and source code, understand exactly why memory keeps growing.
See exactly where objects are created, what keeps them alive, and why they never leave memory.
Drop the agent into your app. Deploy. Watch your memory behavior appear in real time — no config changes, no infrastructure to manage.
works with Express · NestJS · Fastify · any Node.js runtime
Rytena samples heap and GC behavior in-process, continuously. When retention patterns deviate from your baseline — a growing buffer, an unbounded array, a listener leak — you get an alert before it turns into an OOM.
Instead of a graph and a metric, Rytena resolves the retention path back to the exact allocation site — file, line, and the reference chain keeping the object alive. No guessing, no snapshot diffing, no war room.
Rytena identifies the pattern responsible — unbounded caches, dangling closures, orphaned timers — and suggests the correction inline. You resolve the underlying cause once instead of patching the same class of leak every quarter.
Every leak leaves a trail — a new set of objects that survived when they shouldn't have. Rytena diffs snapshots automatically, so you see exactly what grew, what stayed, and what's holding the reference.
One agent. Zero native dependencies. Drops into any Node.js process — regardless of your framework, runtime, or deployment target.
View integrationsInstall the agent. Deploy. See what was invisible before.
free while in beta · no credit card required