Galileo
AI evaluation and observability platform that turns evals into production guardrails, now part of Splunk.
Updated · AppBreakup editorial · Web, Self-hosted
Galileo has been acquired. Galileo's documentation says that as of 7 August 2026 Galileo is now Splunk Agent Observability.
Is Galileo free?
No, it's a paid product
- Starting price:
- $100/month per 1.2M spans, billed annually
Checked on Galileo's site Nov 8, 2026
6 alternatives with a free optionSwitch from Galileo to
All 6
BraintrustStarting price: $249/month (Pro)
HoneyHiveFree plan + paid
DatadogStarting price: Infrastructure Pro, $15 per host/month billed annually
- Verified facts
- 5 of 5
- Alternatives ranked
- 6
- Approved reviews
- 0
- Visits sent from here
- 0
About Galileo
Galileo is an evaluation and observability platform for LLM apps and AI agents. It ships with more than 20 ready-made evaluators for RAG, agents, safety and security, lets teams build custom evaluators from expert annotations, and then distils those expensive LLM-as-a-judge checks into its own small Luna models so every production request can be scored cheaply and blocked or rerouted when it fails. An insights engine looks across traces to point out failure patterns and suggest fixes. It can run as SaaS, in a virtual private cloud or on-premises. Cisco completed its acquisition of Galileo in 2026, and the product is now sold as Splunk Agent Observability within Splunk Observability Cloud, priced by span volume and billed annually. The galileo.ai site still offers sign-up and documentation, but buyers should expect to deal with Splunk.
Best for: Enterprises, especially Splunk or Cisco customers, wanting guardrails on all agent traffic.
Galileo pricing (checked Nov 8, 2026)
Each line is quoted from Galileo's own site, with the page it came from.
| Plan or term | What it says | Checked | Source |
|---|---|---|---|
| Starting price | $100/month per 1.2M spans, billed annually | Nov 8, 2026 | galileo.ai |
Pros and cons
What works
- 20+ built-in evaluators for RAG, agents, safety and security
- Luna models make scoring all production traffic affordable
- SaaS, VPC and on-prem deployment options
- Fits into Splunk Observability Cloud for existing Splunk users
Why people leave
- Now sold through Splunk with annual billing, heavier to buy than self-serve rivals
- Not open source
- Product direction now tied to Splunk's roadmap after the Cisco deal
Galileo vs Braintrust, HoneyHive and Datadog
From each app's listing and the prices verified on its own site. A dash means we haven't verified it yet.
| Attribute | Galileo | Braintrust | HoneyHive | Datadog |
|---|---|---|---|---|
| Pricing | Paid | Free plan + paid | Free plan + paid | Free plan + paid |
| Verified price | $100/month per 1.2M spans, billed annually | $249/month (Pro) | — | Infrastructure Pro, $15 per host/month billed annually |
| Free plan | No | Starter, $0/month | 10,000 events/month | Yes, up to 5 hosts with 1-day metric retention |
| Open source | No | No | No | No |
| Self-hostable | No | No | No | No |
| Platforms | Web, Self-hosted | Web | Web, Self-hosted | Web, iOS, Android |
Top Galileo alternatives
See all 6- 1Braintrust68.8
Independent, self-serve eval platform with a free plan and published Pro pricing.
- 2HoneyHive64.8
Free tier plus self-hosted and hybrid Enterprise options, without buying through Splunk.
- 3Datadog64.7
LLM monitoring in the same place as infrastructure and APM for teams on Datadog rather than Splunk.
- 4
Traceloop61.8Open-source OpenTelemetry SDK and built-in quality checks with a free plan.
- 5
Evidently AI57.5Open-source library and platform for LLM evals and monitoring, for teams that want to self-host their evaluation stack.
Why people left Galileo
In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.
No switching stories yet. If you moved away from Galileo, review the app you switched to and tell us why.
Reviews
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Galileo: common questions
What is Galileo?
Galileo: AI evaluation and observability platform that turns evals into production guardrails, now part of Splunk. Best for enterprises, especially Splunk or Cisco customers, wanting guardrails on all agent traffic. Available for Web, and you can host it yourself.
Is Galileo free?
No, Galileo is a paid product. Starting price: $100/month per 1.2M spans, billed annually (checked on Galileo's own site).
How much does Galileo cost?
Galileo is a paid product. Starting price: $100/month per 1.2M spans, billed annually. Checked on Galileo's own site, November 2026.
Is Galileo open source?
No, Galileo is not open source. Open-source alternatives include Evidently AI.
What platforms does Galileo run on?
Galileo is available for Web and Self-hosted.
What are the best alternatives to Galileo?
The highest-ranked Galileo alternatives right now are Braintrust, HoneyHive and Datadog. See the full ranked list for pricing, platforms and verified facts.
Galileo vs Braintrust: what's the difference?
Galileo is a paid product; Braintrust is free with paid plans. Verified prices: Galileo $100/month per 1.2M spans, billed annually, Braintrust $249/month (Pro). Both run on Web.