OrcaReplay is an open-source record-and-replay engine that allows developers to capture, debug, and fork AI agent executions.
It attaches to agents as a local proxy to record model calls, shell commands, and file operations, enabling deterministic offline replay and cross-model testing.
- 01
Deterministic offline replay with network egress blocked
- 02
Cross-model forking from any execution checkpoint
- 03
Capture of shell exit codes, file system changes, and MCP traffic
- 04
Causal graph visualization of agent decisions
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No-patch integration via environment variables and local proxy
Open Source
The tool is open-source (Apache-2.0). Replay is free and offline. Live model comparisons via orca compare incur standard API costs for the models used.
Best for
Debugging complex, multi-step AI agent workflows and comparing model performance on identical execution paths.
Not ideal for
Interactive terminal sessions where user input is not captured on the wire, or sandboxing untrusted code (it is not a secure sandbox).
A powerful, developer-focused observability tool that brings time-travel debugging to AI agents, effectively bridging the gap between high-level logs and granular machine behavior.
Launched September 1, 2026, with ongoing support for major coding agents like Claude Code, Codex, and Hermes, and the introduction of TLS interception for opaque API traffic.
As of
Is OrcaReplay free?+
Yes - OrcaReplay is Open Source. The tool is open-source (Apache-2.0). Replay is free and offline. Live model comparisons via orca compare incur standard API costs for the models used.
Is OrcaReplay open source?+
Yes - OrcaReplay is open source. The tool is open-source (Apache-2.0). Replay is free and offline. Live model comparisons via orca compare incur standard API costs for the models used.
Who is OrcaReplay best for?+
Debugging complex, multi-step AI agent workflows and comparing model performance on identical execution paths.
Who is OrcaReplay not ideal for?+
Interactive terminal sessions where user input is not captured on the wire, or sandboxing untrusted code (it is not a secure sandbox).
What are the best OrcaReplay alternatives?+
The closest OrcaReplay alternatives on ai.dosa.dev are Pieces for Developers, agenttrace, Vibe Kanban - all listed under Developer Productivity & Workflow.
Who makes OrcaReplay?+
OrcaReplay is developed by Continuum AI (OrcaRouter team). It is listed in the Developer Productivity & Workflow category on ai.dosa.dev.
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