crail

Best LLM & Agent Infrastructure for startups

Last verified:

Best overall: Braintrust
Cheapest: Arize Phoenix
Self-serve, no sales call: Arize Phoenix
  1. 1. Braintrust88/100 agent-readiness

    Eval-first observability and experimentation platform for building and monitoring high-quality LLM/agent apps.

  2. 2. Arize Phoenix86/100 agent-readiness

    Open-source LLM tracing, evaluation, and experimentation platform built on OpenTelemetry, by Arize AI.

  3. 3. Helicone85/100 agent-readiness

    Open-source LLM observability platform and AI gateway for monitoring, evaluating, and optimizing LLM apps.

  4. 4. Langfuse85/100 agent-readiness

    Open-source LLM engineering platform for tracing, evals, prompt management, and observability of LLM apps and agents.

  5. 5. Weights & Biases Weave84/100 agent-readiness

    W&B Weave is Weights & Biases' toolkit for tracing, evaluating, and monitoring LLM apps and agents in production.

FAQ

What's the best LLM & Agent Infrastructure tool for startups?

Based on Crail's agent-readiness score, Braintrust ranks highest among tools serving startups (88/100), among 10 vendors tracked in this category that fit startups.

Which is cheapest to start with?

Arize Phoenix has a free tier.

Can I buy without talking to sales?

Yes — Arize Phoenix can be purchased self-serve without a sales call.