Native Flight Recorder

Crash observability that starts before the crash.

CircleBox captures pre-crash mobile context with fixed-memory ring buffers. Designed for high-scale apps where every byte and millisecond matters.

<256KBMemory Overhead

ZeroNetwork Default

50+Events Buffered

● LIVE

247thermal_state_changedserious

248memory_pressurewarn

249network_transitionwifi → none

250native_exception_prehookfatal

Platform Support

Release-ready packages

Use CircleBox standalone or compose with your existing observability stack.

Architecture

Designed for low bandwidth and low overhead production operation.

Native ring buffer records thermal, memory, battery, connectivity, lifecycle, permission, and jank signals with fixed memory.

Crash-time prehook writes pending report atomically, then recovers on next app start for deterministic export flow.

Generate JSON, CSV, gzip, and summary artifacts. Keep full forensic payloads and lightweight operational snapshots.

Optional cloud upload (Worker + R2 + regional Supabase) and optional Sentry/PostHog forwarding via companion adapters.

Why CircleBox

Optimized for context depth, not just exception counting.

Capability	CircleBox	Generic Crash Tools
Native environmental crash context (ring buffer)	✓ Built-in	Partial, app-level breadcrumbs
Crash-time pending report recovery after hard crash	✓ Built-in pending export recovery	Varies by SDK
Dependency-free core SDKs	✓ Yes, adapters are optional	Often tied to vendor backend
Cloud ingest and downloadable raw reports	✓ Worker + R2 + dashboard	Vendor-managed only

Deployment Options

Local exports, no backend requirement. Immediate mobile crash context for QA and debugging.

Recommended

Managed ingest, regional routing, signed raw downloads, and searchable crash timelines.

Forward CircleBox narratives into Sentry/PostHog where teams already run alerting.

Get started with CircleBox today. Open source core, powerful cloud.