The 3 Best DeepEval Alternatives in 2026

Promptfoo runs declarative test suites against your prompts, models and agents from the command line or CI, and compares outputs side by side across providers. Its red-teaming mode generates adversarial probes for jailbreaks, prompt injection, PII leaks and harmful output, which is why security teams use it. The core is MIT-licensed (about 26K GitHub stars) and the Community edition is free forever, including 10K red-team probes a month and self-hosting. Enterprise and On-Premise add team sharing, continuous monitoring, SSO and a compliance dashboard at custom prices. OpenAI agreed to acquire Promptfoo in March 2026 and said the open-source project would continue.

• Free and open source (MIT)
• Best-known red-teaming suite for LLM apps
• Config-file tests that run in CI

Ragas is the standard toolkit for measuring retrieval-augmented generation. It scores whether answers are grounded in the retrieved context (faithfulness), whether retrieval found the right passages (context precision and recall) and whether the answer addresses the question, using LLM-based and traditional metrics. It can also generate synthetic test sets from your own documents, so you do not have to hand-write questions. It is Apache-2.0 licensed with about 16K GitHub stars, integrates with LangChain, LlamaIndex and observability tools, and is free. Agent-specific evals are listed as coming soon.

• The reference metrics for RAG quality
• Generates test sets from your documents
• Free and open source

Coval tests voice and chat agents the way self-driving teams test cars: it runs your agent against many simulated callers, personas and scenarios before launch, scores every conversation, then monitors live calls in production with alerts and human review queues. It has a REST API, CLI and MCP server, and states SOC 2 Type II, HIPAA and GDPR compliance. Starter is $100/month (100 simulation minutes, 1,000 monitored calls, $0.40 per extra simulation minute), Growth $500/month (1,000 simulation minutes, 10,000 monitored calls) and Enterprise from $4,500/month. Plans include unlimited seats and a 7-day trial that requires a card.

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