Coval vs Promptfoo: Which is Better in 2026?
Choosing between Coval and 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
- 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
- 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
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
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.
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