---
title: "Coval vs Promptfoo: Which is Better in 2026? | App Stack Builder"
description: "Coval vs Promptfoo compared for 2026 — pricing, free tiers, features, pros & cons. See which ai evals & agent testing tool is the better fit for your startup."
source: https://appstackbuilder.com/compare/coval-vs-promptfoo
retrieved: 2026-10-14
---

![](https://www.google.com/s2/favicons?domain=coval.ai&sz=128)

vs

![](https://www.google.com/s2/favicons?domain=promptfoo.dev&sz=128)

# Coval vs Promptfoo: Which is Better in 2026?

AI Evals & Agent Testing

Choosing between [Coval](https://appstackbuilder.com/tools/coval) and [Promptfoo](https://appstackbuilder.com/tools/promptfoo)? Both are popular ai evals & agent testing tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.

Quick verdict

Promptfoo is the safer pick if budget matters — it has a free tier, while Coval does not. Choose Coval when its specific features justify the cost.

## Coval vs Promptfoo — Side by Side

|                | Coval                                              | Promptfoo                                     |
| -------------- | -------------------------------------------------- | --------------------------------------------- |
| Category       | AI Evals & Agent Testing                           | AI Evals & Agent Testing                      |
| Pricing        | From $100/mo                                       | Free · paid plans by quote                    |
| Starting price | From $100/mo                                       | Free tier available                           |
| Free tier      | —                                                  | ✓                                             |
| Rating         | 4.4                                                | 4.6                                           |
| Best for       | AI Evals & Agent Testing — agent-testing, voice-ai | AI Evals & Agent Testing — evals, red-teaming |

## Pros & Cons

![](https://www.google.com/s2/favicons?domain=coval.ai&sz=128)

[Coval](https://appstackbuilder.com/tools/coval)

* ✓Built for voice agents, with realistic simulated callers
* ✓Testing and production monitoring in one
* ✓Published prices and unlimited seats
* ✗No free tier; the trial needs a card
* ✗Simulation minutes run out quickly at scale
* ✗Mostly voice-focused

![](https://www.google.com/s2/favicons?domain=promptfoo.dev&sz=128)

[Promptfoo](https://appstackbuilder.com/tools/promptfoo)

* ✓Free and open source (MIT)
* ✓Best-known red-teaming suite for LLM apps
* ✓Config-file tests that run in CI
* ✗Owned by OpenAI since 2026, so roadmap may follow OpenAI's platform
* ✗YAML configs get long for complex agents
* ✗Team features are Enterprise-only

## Key Features Compared

### Coval

* ✓1,000 simulation minutes
* ✓10,000 monitored calls
* ✓$0.25 per extra simulation minute
* ✓25 concurrent simulations

### Promptfoo

* ✓All eval features and providers
* ✓Red teaming: 10K probes / month
* ✓Self-hosting
* ✓CI integration

### Choose Coval if…

* ✓Built for voice agents, with realistic simulated callers
* ✓Testing and production monitoring in one
* ✓Published prices and unlimited seats

[Coval review & pricing ](https://appstackbuilder.com/tools/coval)

### Choose Promptfoo if…

* ✓You want to start free — Promptfoo has a free tier and Coval does not.
* ✓Free and open source (MIT)
* ✓Best-known red-teaming suite for LLM apps
* ✓Config-file tests that run in CI

[Promptfoo review & pricing ](https://appstackbuilder.com/tools/promptfoo)

## Frequently Asked Questions

Is Coval better than Promptfoo?⌄

Promptfoo is the safer pick if budget matters — it has a free tier, while Coval does not. Choose Coval when its specific features justify the cost.

What is the difference between Coval and Promptfoo?⌄

Coval — Simulation and monitoring for voice AI agents: test against simulated callers and personas before launch, then score live calls. Promptfoo — Open-source CLI for testing prompts, agents and RAG apps, with built-in red teaming for jailbreaks, prompt injection and data leaks. Both are ai evals & agent testing tools; the comparison table above breaks down pricing, free tiers, and what each is best for.

Coval vs Promptfoo: which is cheaper?⌄

Coval pricing: From $100/mo. Promptfoo pricing: Free · paid plans by quote. Confirm current pricing on each tool's official site, as plans change.

Which is rated higher, Coval or Promptfoo?⌄

In our catalog, Coval rates 4.4 out of 5 and Promptfoo rates 4.6 out of 5, so Promptfoo has a slight edge on reviews.

See more options in our guide to the [best ai evals & agent testing tools for startups](https://appstackbuilder.com/categories/ai-evals).

## Still not sure which to pick?

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