Retrace
Retrace is an AI-powered Development tool — The execution replay engine for AI agents - record, replay, fork and share agent runs. Best for: Development. Pricing: Freemium (GateOnAI Score: 60/100).
The execution replay engine for AI agents - record, replay, fork and share agent runs.
Retrace is an execution replay engine that records every LLM call, tool call, cost and error made by an AI agent. By adding a single decorator to a Python or TypeScript agent—compatible with LangChain, CrewAI and LlamaIndex—the SDK captures each step, allowing you to replay a run, fork from the exact point of failure, modify inputs or prompts, and re‑execute to verify a fix before deployment. The platform provides a UI for live streaming of traces, step‑by‑step replay, and interactive RCA analysis, including span timings, costs and error details. It also offers automated quality checks such as groundedness gaps, statistical drift detection, budget or loop limits, and guardrails that can halt or block problematic actions in real time. Users can search raw JSON spans or use semantic search to locate bugs quickly, and share trace tapes for collaboration. Retrace’s free tier includes up to 1,000 recorded traces per month, with no infrastructure to manage beyond signing in with GitHub.
Summary written from Retrace's own website on 22 Oct 2026. Check the vendor's website for current details.
How to evaluate Retrace before you buy
What GateOnAI has on record
- Pricing model: Free plan and paid plans
- GDPR: The provider's page linked here refers to the GDPR (checked automatically) (source)
- EU data hosting: Not recorded on GateOnAI - ask the vendor
- Website check: Online at our check on 3 Nov 2026
Questions to ask the vendor
- Will you sign a GDPR data processing agreement (Article 28) and share your list of sub-processors?
- Where is our data stored and processed, and is it used to train your models?
- What does the free plan include, and what does the plan we need cost per user?
- Can we export all our data, and how is it deleted when we cancel?
- (Development) Is our code used to train models, and can we opt out?
- (Development) Who owns the generated code, and do you offer protection against licence or copyright claims?
Full checklist: 43 questions to ask an AI vendor · Alternatives to Retrace · Compare Retrace with Cursor
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