What is a rag (retrieval-augmented generation)?

A technique for improving LLM accuracy by providing the model with relevant external knowledge retrieved from a data source (like a vector database) before it generates a response.

Who uses one?

ML engineers and AI product teams measuring model quality

What does it cost?

Pricing varies. The cheapest provider in our Top 11 starts around $1000/mo. See the cheapest providers ranked.

How do I pick one?

Read the full methodology for our 9.4-point scoring framework, then look at the canonical The 11 Best LLM Evaluation Platforms (2026). If you want a slice of the ranking by price, fit, or compliance, jump to: cheapest · highest-rated · fastest onboarding.

Source: Top 11 The 11 Best LLM Evaluation Platforms (2026), verified May 31, 2026.