Free Galileo alternatives: 6 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rank

6 of the 6 Galileo alternatives we track can be used for free (free, open source, or with a free plan). Braintrust, HoneyHive and Datadog rank highest, with facts last verified Nov 8, 2026.

Galileo has been acquired. Galileo's documentation says that as of 7 August 2026 Galileo is now Splunk Agent Observability.

Quick comparison

#	App	Pricing	Verified price	Open source	Platforms	Verified facts	Score
1	Braintrust	Free plan + paid	$249/month (Pro)	No	Web	5 of 5	68.8
2	HoneyHive	Free plan + paid	—	No	Web, Self-hosted	5 of 5	64.8
3	Datadog	Free plan + paid	Infrastructure Pro, $15 per host/month billed annually	No	Web, iOS, Android	6 of 7	64.7
4	Traceloop	Free plan + paid	—	No	Web, Self-hosted	7 of 7	61.8
5	Evidently AI	Open source	—	Yes	Self-hosted, Web	4 of 4	57.5
6	Fiddler AI	Free plan + paid	$0.002 per trace	No	Web, Self-hosted	4 of 4	55.9

1. BraintrustTop pick
Best for: AI product teams that treat evals as the main gate before shipping prompt and model changes
Free plan + paidWeb
68.8
score / 100
Why switch from Galileo
Independent, self-serve eval platform with a free plan and published Pro pricing.
Pros
Unlimited users and projects even on the free plan
Strong eval workflow: datasets, scorers and experiment comparison
SDKs in many languages, plus OpenTelemetry support
Startup programme with months of Pro for free
Cons
Free plan keeps data for only 14 days
Big jump from the free tier to the Pro plan price
SAML SSO and self-hosting are Enterprise-only
Core platform is not open source, unlike some rivals
Visit Braintrust Details and reviews
How this score is calculated
Editorial fit ×0.3100
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Braintrust a good Galileo alternative?
Verified facts
5 of 5 verified
Free plan
Starter, $0/month
Checked Nov 8, 2026braintrust.dev(opens source in a new tab)
Starting price
$249/month (Pro)
Checked Nov 8, 2026braintrust.dev(opens source in a new tab)
Users
Unlimited on every plan
Checked Nov 8, 2026braintrust.dev(opens source in a new tab)
Free data retention
14 days
Checked Nov 8, 2026braintrust.dev(opens source in a new tab)
SDKs
Python, TypeScript, Go, Ruby, C# and more
Checked Nov 8, 2026braintrust.dev(opens source in a new tab)
2. HoneyHive
Best for: Enterprises in regulated sectors that need agent tracing and evals with self-hosting options
Free plan + paidWeb, Self-hosted
64.8
score / 100
Why switch from Galileo
Free tier plus self-hosted and hybrid Enterprise options, without buying through Splunk.
Pros
Free plan with full observability and evaluation features
OpenTelemetry-native SDKs with auto-instrumentation for many frameworks
Self-hosted, hybrid and single-tenant deployment on Enterprise
SOC 2 Type II, GDPR and HIPAA compliance
Cons
Free plan is limited to 10,000 events and five users
No published mid-tier plan between free and Enterprise
Hosted free tier only stores data in one US region
Visit HoneyHive Details and reviews
How this score is calculated
Editorial fit ×0.387
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is HoneyHive a good Galileo alternative?
Verified facts
5 of 5 verified
Free plan
10,000 events/month
Checked Nov 8, 2026honeyhive.ai(opens source in a new tab)
Free plan users
Up to 5
Checked Nov 8, 2026honeyhive.ai(opens source in a new tab)
Self-hosting
Enterprise plan
Checked Nov 8, 2026honeyhive.ai(opens source in a new tab)
Compliance
SOC 2 Type II, GDPR, HIPAA
Checked Nov 8, 2026honeyhive.ai(opens source in a new tab)
SDKs
Python and TypeScript, OpenTelemetry
Checked Nov 8, 2026honeyhive.ai(opens source in a new tab)
3. Datadog
Best for: Cloud-heavy teams that want metrics, traces, logs and alerts in one hosted product and can budget for it
Free plan + paidWeb, iOS, Android
64.7
score / 100
Why switch from Galileo
LLM monitoring in the same place as infrastructure and APM for teams on Datadog rather than Splunk.
Pros
Very wide integration catalogue that works with little setup
Metrics, traces and logs are linked in one interface
Mature dashboards, monitors and on-call features
Cons
Per-product, per-host pricing makes bills hard to forecast
Custom metrics and log volume get expensive quickly
No self-hosted option
Visit Datadog Details and reviews
How this score is calculated
Editorial fit ×0.341
Reviews ×0.363
Clicks (90 days) ×0.15100
Freshness ×0.1590
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Datadog a good Galileo alternative?
Verified facts
6 of 7 verified
Starting price
Infrastructure Pro, $15 per host/month billed annually
Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
Free tier
Up to 5 hosts, 1-day metric retention
Source changed Nov 8, 2026datadoghq.com(opens source in a new tab)
Free trial
14 days
Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
Integrations
1,000+
Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
Enterprise plan
$23 per host/month billed annually
Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
APM plan
From $31 per host/month
Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
Free plan
Yes, up to 5 hosts with 1-day metric retention
Checked Nov 8, 2026datadoghq.com(opens source in a new tab)
4. TraceloopAcquired
Best for: Teams that want vendor-neutral OpenTelemetry tracing for LLM apps, including air-gapped setups
Free plan + paidWeb, Self-hosted
61.8
score / 100
Why switch from Galileo
Open-source OpenTelemetry SDK and built-in quality checks with a free plan.
Pros
Open-source OpenLLMetry SDK works with many observability backends
Generous free plan of 50,000 spans a month
On-prem and air-gapped deployment for Enterprise
SDKs for Python, TypeScript, Go and Ruby
Cons
Free plan keeps data for only 24 hours
Joining ServiceNow adds uncertainty about the standalone product
No published price between free and Enterprise
Visit Traceloop Details and reviews
How this score is calculated
Editorial fit ×0.377
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Traceloop a good Galileo alternative?
Verified facts
7 of 7 verified
Status
Joining ServiceNow
Checked Nov 8, 2026traceloop.com(opens source in a new tab)
Free plan
Yes, $0/month up to 50K spans and 5 seats
Checked Nov 8, 2026traceloop.com(opens source in a new tab)
SDK license
Apache-2.0
Checked Nov 8, 2026github.com(opens source in a new tab)
Self-hosting
On-prem and air-gapped
Checked Nov 8, 2026traceloop.com(opens source in a new tab)
Languages
Python, TypeScript, Go, Ruby
Checked Nov 8, 2026traceloop.com(opens source in a new tab)
Enterprise plan
Custom pricing for over 50K spans/month
Checked Nov 8, 2026traceloop.com(opens source in a new tab)
Free trial
14 days
Checked Nov 8, 2026traceloop.com(opens source in a new tab)
5. Evidently AI
Best for: ML and data teams who want code-first LLM evals and model drift monitoring on their own infrastructure
Open sourceSelf-hostableSelf-hosted, Web
57.5
score / 100
Why switch from Galileo
Open-source library and platform for LLM evals and monitoring, for teams that want to self-host their evaluation stack.
Pros
Apache 2.0 licensed, with no paid tier needed for the core features
Covers both classic ML drift monitoring and LLM and agent evaluation
Over 100 built-in metrics, plus custom checks and LLM-as-judge
Evaluations run as tests, so they slot into CI pipelines
Cons
Code-first Python library, so non-engineers will struggle to set up checks
You run and maintain the self-hosted platform yourself
Lighter on prompt management and production tracing than LLM-first tools
Visit Evidently AI Details and reviews
How this score is calculated
Editorial fit ×0.363
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Evidently AI a good Galileo alternative?
Verified facts
4 of 4 verified
License
Apache 2.0
Checked Nov 8, 2026github.com(opens source in a new tab)
Built-in metrics
100+
Checked Nov 8, 2026evidentlyai.com(opens source in a new tab)
Self-hosting
Yes
Checked Nov 8, 2026docs.evidentlyai.com(opens source in a new tab)
Covers
LLMs, RAG, agents and ML models
Checked Nov 8, 2026evidentlyai.com(opens source in a new tab)
6. Fiddler AI
Best for: Regulated enterprises that need agent observability, guardrails and AI governance in one platform
Free plan + paidWeb, Self-hosted
55.9
score / 100
Why switch from Galileo
Enterprise model monitoring covering both classic ML and LLMs, with guardrails and explainability in one platform.
Pros
Monitors both predictive ML models and LLM agents in one place
Guardrails run on its own models, so checks don't add outside LLM API costs
Can be deployed as SaaS, in your VPC or on-premises
Governance and compliance features aimed at regulated industries
Cons
Free plan covers guardrails only, not full observability
Not open source, unlike Evidently or Langfuse
Enterprise features and on-prem deployment need a sales contract
Visit Fiddler AI Details and reviews
How this score is calculated
Editorial fit ×0.357
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Fiddler AI a good Galileo alternative?
Verified facts
4 of 4 verified
Free plan
Real-time guardrails
Checked Nov 8, 2026fiddler.ai(opens source in a new tab)
Developer plan
$0.002 per trace
Checked Nov 8, 2026fiddler.ai(opens source in a new tab)
Deployment
SaaS, VPC or on-premise
Checked Nov 8, 2026fiddler.ai(opens source in a new tab)
Guardrail latency
Under 80 ms
Checked Nov 8, 2026fiddler.ai(opens source in a new tab)

Quick comparison

1. BraintrustTop pick

Pros

Cons

Verified facts

2. HoneyHive

Pros

Cons

Verified facts

3. Datadog

Pros

Cons

Verified facts

4. TraceloopAcquired

Pros

Cons

Verified facts

5. Evidently AI

Pros

Cons

Verified facts

6. Fiddler AI

Pros

Cons

Verified facts