Galileo alternatives

3 tools to consider instead of Galileo, shown against it.

Galileo Patronus AI Braintrust Arize Phoenix
Vendor Galileo Patronus AI Braintrust Data Arize AI
Pricing model Usage-based Usage-based Usage-based Open source + paid options
Free tier Yes Yes Yes Yes
Deployment Cloud, Self-hosted Cloud, Self-hosted Cloud, Self-hosted Cloud, Self-hosted
Open source No No No Yes (Apache-2.0)
Best for Teams that want real-time guardrails intervening on production traffic, not just after-the-fact dashboards. Teams that want ready-made, scored evaluators for safety and accuracy risks rather than building custom scoring from scratch. Teams that want evaluation and experimentation as the primary workflow, with production monitoring layered on top. Developers who want a free, local, open-source tracing and eval library during development before committing to a hosted platform.
Pricing

Free tier includes a monthly trace allowance with unlimited users and custom evals; Pro is a flat monthly fee for a higher trace cap; Enterprise is custom with unlimited traces and choice of hosting.

Free $0/month
Pro $100/month, billed yearly
Enterprise Custom

Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget.

Free Developer tier includes limited projects/experiments and $10 in evaluator credits; evaluator API calls are billed per 1,000 calls (small vs. large models priced differently); Enterprise is custom with unlimited usage and on-prem/VPC deployment.

Developer $0
Evaluator API add-on $10 per 1,000 small-model calls; $20 per 1,000 large-model calls
Enterprise Custom

Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget.

Free Starter tier includes a small credit and data allowance with per-unit overage; Pro adds a larger allowance plus a monthly platform fee; Enterprise is custom with on-prem/hosted deployment options.

Starter $0/month
Pro $249/month
Enterprise Custom

Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget.

Phoenix itself is free, open-source, and local-first with no hosted fees; Arize AX, the company's separate commercial production-monitoring platform, has its own free, Pro, and Enterprise plans metered by trace spans and data ingestion.

Phoenix (open source) Free
Arize AX Free $0
Arize AX Pro $50/month
Arize AX Enterprise Custom

Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget.

Features
  • Tracing for LLM and agent applications
  • Real-time production guardrails against hallucinations and unsafe outputs
  • Custom evaluation metrics at scale
  • Analytics dashboards for trend detection across traces
  • Role-based access control
  • Hosted, VPC, or on-prem deployment on Enterprise
  • Pre-built evaluator models for hallucination, PII leakage, and toxicity detection
  • Custom evaluator building
  • Dataset-based experiments and model/prompt comparison
  • Evaluation API priced per call
  • Synthetic eval-dataset generation on Enterprise
  • On-prem/VPC deployment on Enterprise
  • Dataset-based experiments comparing prompt/model changes
  • Custom scoring functions applied both offline and in production
  • Production tracing and logging
  • Prompt playground for iterating against real examples
  • Side-by-side experiment comparison views
  • Role-based access control on paid tiers
  • OpenTelemetry-based tracing for LLM and agent applications
  • Built-in LLM-as-judge and heuristic evaluators
  • Local-first, notebook-friendly workflow
  • Prompt iteration and comparison tools
  • Dataset-based experiments
  • Optional upgrade path to Arize AX for hosted production monitoring

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