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COLVO vs Promptfoo

Promptfoo describes itself as “AI security testing: "Ship agents, not vulnerabilities" - automated testing that finds and fixes AI risk in development”. COLVO answers a narrower question: did your agent’s refund or cancellation actually happen correctly in Stripe — tested before release, guarded and verified live.

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At a glance

Different questions — often used together.

COLVOPromptfoo
What it isTesting and live guarding for AI agents that refund, cancel or change customer accounts — judged by the provider state, not the reply.AI security testing: "Ship agents, not vulnerabilities" - automated testing that finds and fixes AI risk in development. source ↗
Main features
  • Sandbox with a simulated Stripe account per attempt, with injected faults
  • 22 refund and cancellation scenarios, CI gate
  • Guard: mandates, human approval, idempotent execution
  • Independent re-read of Stripe after every action
  • Automated red teaming for agents and RAG apps source ↗
  • Evaluations of prompts, models and RAG pipelines source ↗
  • Guardrails against jailbreaks and adversarial attacks in real time source ↗
  • Code scanning for LLM vulnerabilities in IDE and CI/CD source ↗
  • MCP proxy to secure Model Context Protocol traffic source ↗
Checks the payment provider’s state after an agent actionYes — every action is re-read and marked verified, mismatch or unverifiableNot described on their public pages
Holds a live action for human approvalYes — above a threshold set in the mandate, before anything reaches StripeNot described on their public pages
Open sourceHosted service; SDKs on npm and PyPIPartly — open-source libraries plus a commercial platform
PricingFree · Test €19 · Guard €99 per month (pricing)Community edition free (up to 10k probes/month); Enterprise and On-Premise are custom pricing. source ↗
Best forTeams whose agents move money or change subscriptions, and who need proof it went rightDevelopers and security teams who want to red-team and evaluate LLM apps and agents for vulnerabilities before shipping.

Facts about Promptfoo come only from their own public pages (linked above), last verified on Sep 30, 2026. “Not described on their public pages” means we did not find it there — not that it is impossible. Promptfoo is a trademark of Promptfoo, Inc.. Spotted something out of date? Tell us and we will fix it.

When to pick which

Use both when your agent writes to money.

Keep Promptfoo for what it is built for. Add COLVO where a wrong action costs money: it tests refunds and cancellations in a sandbox that fails on purpose, then guards and verifies the live calls.

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