Prefactor

by PrefactorMelbourne, Australia; remote-first teamNo ratings yet

Evaluate live agent runs and intervene when actions need review

Linked from prefactor.tech · checked 30 Oct

Tool type: Runtime agent evaluation and control platform
Made for: Teams operating production AI agents
Runs on: TypeScript and Python SDKs, API and dashboard
Last checked: 30 Oct 2026; 2 product sources

What it does

Prefactor records and evaluates AI agent activity during execution. Teams use SDKs or APIs to capture calls, tool actions and other steps, then apply evaluations for task quality, cost and risk. Policies can hold an action for human approval or block it rather than only showing a score after the run.

The platform supports development and production monitoring, with agent versioning and controls for moving changes between environments. It is useful for teams that need to connect an evaluation result to a runtime decision. Charges are based on recorded spans, with retention and agent limits varying by plan; evaluation scores still depend on the checks and thresholds a team configures.

What it can do

Runtime tracing
Live evaluations
Risk checks
Human approvals
Policy enforcement
Agent versioning
Environment promotion

Works with

LangChain
Vercel AI SDK
LiveKit
OpenClaw

Before you choose

A span is a recorded agent step; busy multi-step agents can create substantial usage.
LLM judges and custom evaluations need validation for the intended task.

Listed under

Get started

Create a workspace and instrument the agent with an SDK.
Define evaluations, risk checks and intervention policies.
Review live runs and tune the checks against actual outcomes.

Create a Prefactor account

Plans and prices

Prices in USD

Dev includes 5,000 spans/month, up to three agents and seven-day retention. Startup is $49/month with 15,000 spans, then $0.0025/span. Monthly Scaleup is $199 with 100,000 spans, then $2.50/1,000; annual terms differ.

Startup monthly$49/mo

Scaleup monthly$199/mo

Source: prefactor.tech/pricing, checked 30 Oct 2026. Prices can change; check before you buy.

Sources for this overview

Product pages, documentation, and pricing checked 30 Oct 2026. Each source supports part of the overview; availability and prices can change.

Prefactor | Agent Evaluation Runtime ↗prefactor.tech
AI Agent Observability & Evaluation Pricing | Prefactor ↗prefactor.tech

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What’s changed

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Signals

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Data and security

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Training on your files, compliance, hosting and the models behind it. Free with an account.

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Where this comes from

How we research

Company website: prefactor.tech: product, pricing and policy pages
YC directory mirror: Batch and company name
Social accounts: Accounts the company links, and its posts on X
Human review: Checked by a person
knowledge_base
manual_review

Last checked 30 Oct 2026. Every field keeps its source and date; unknown means we couldn’t confirm it.