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Best LLM & Agent Infrastructure for small businesses

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Crail tracks 10 LLM & Agent Infrastructure vendors that list small businesses as a fit. These are the 5 that rank highest once the list is weighted for small businesses, and each one is shown with the published entry price, what that tier actually includes, and whether you can try it first — the facts that decide the shortlist at this size, rather than the same summary on every page.

How this list is weighted for small businesses

  • 60% of the vendor's Crail agent-readiness score
  • 15 points for a published free tier
  • 15 points for being buyable self-serve, without a sales call
  • up to 10 points for a low entry price (free tier, then a cheapest paid tier under $30, then under $75)

Startups and small businesses share the price-and-self-serve weighting; midmarket and enterprise share the compliance weighting. The full rules are on the methodology page.

Best overall: Braintrust

Lowest published paid price: Langfuse

1. Braintrust88/100 agent-readiness

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

  • Pricing model: freemium
  • Entry paid tier: Pro at $249/month, $249 credits, 5 GB processed data/month, 50,000 scores, 30-day retention
  • Free trial: none published, but there is an ongoing free tier
  • Buy self-serve: yes

2. Arize Phoenix86/100 agent-readiness

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

  • Pricing model: freemium
  • Entry paid tier: Arize AX Pro at $50/month, 50k trace-spans/month
  • Free trial: none published, but there is an ongoing free tier
  • Buy self-serve: yes

3. Helicone85/100 agent-readiness

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

  • Pricing model: freemium
  • Entry paid tier: Pro at $79/month, First 10,000 requests included, then usage-based
  • Free trial: 7 days
  • Buy self-serve: yes

4. Langfuse85/100 agent-readiness

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

  • Pricing model: hybrid
  • Entry paid tier: Core at $29/month, 100k units/month
  • Free trial: none published, but there is an ongoing free tier
  • Buy self-serve: yes

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.

  • Pricing model: freemium
  • Entry paid tier: Pro at $60/month, 10 seats included, 100 GB storage/month, 1.5 GB Weave ingestion/month
  • Free trial: none published, but there is an ongoing free tier
  • Buy self-serve: yes

FAQ

How is this LLM & Agent Infrastructure ranking calculated for small businesses?

This is not the raw agent-readiness leaderboard. Crail scores the 10 LLM & Agent Infrastructure vendors it tracks that fit small businesses, using 60% of the vendor's Crail agent-readiness score; 15 points for a published free tier; 15 points for being buyable self-serve, without a sales call; up to 10 points for a low entry price (free tier, then a cheapest paid tier under $30, then under $75). Braintrust ranks first on both measures: it holds the highest raw agent-readiness score on this list (88/100) and the top score once the small businesses weighting is applied.

What does the cheapest paid plan on this list cost?

Published monthly entry prices on this list run from $29/month (Langfuse, Core tier) to $249/month (Braintrust, Pro tier).

Can a small business trial these before committing?

Helicone (7-day trial). Braintrust, Arize Phoenix, Helicone, Langfuse and Weights & Biases Weave offer an ongoing free tier instead, which is the usual way in to this list.