Arize Phoenix: Open-source platform from Arize AI for tracing and evaluating LLM applications based on OpenTelemetry, self-hosted. These 4 tools cover the same task (LLM monitoring). They are ranked by how many of Arize Phoenix's strongest markets they share, then by how complete their profile is.
Which Arize Phoenix alternative fits which situation
Can store customer data in the EU, headquartered in Germany.
Picked from our profile data, which we check against vendor pages. No vendor paid for a placement.
What Arize Phoenix does
Arize Phoenix is an open-source observability and evaluation tool for LLM applications. Developers trace model calls, score outputs and compare prompt or model versions on their own infrastructure.
Tracing of model calls, retrieval and tool use via OpenTelemetry and OpenInference
Evaluation with LLM-as-a-judge, code checks or human labels
Datasets, experiments and a prompt playground for comparing versions
Phoenix is an open-source project used worldwide that can be run in any self-managed environment. Starting price: from $50 per month.
Before you switch: Check the Elastic License 2.0, which allows internal use but restricts offering Phoenix as a managed service to third parties. Traces can contain user prompts and personal data, so define retention and access. Self-hosting means your team operates the database and updates.
PromptLayer is a platform for managing prompts as versioned assets, testing them and monitoring how they perform in production. It lets product, marketing or content experts change prompts without waiting for an engineering release.
Key functions
Versioned prompts that applications fetch without a new deployment
Evaluations with datasets, human review and automated grading
Monitoring of cost, latency and tokens per prompt version
Compared with Arize Phoenix
Can store data in the EU; Arize Phoenix states no EU option.
Starts lower: from $49 per month, Arize Phoenix from $50 per month.
Strong in the same markets as Arize Phoenix: United States.
Check before buying: Production traces can contain user inputs, so decide what is logged and where it is stored. EU hosting, SSO and self-hosting are Enterprise features; smaller plans run in the US cloud. Check request and evaluation limits of the Free and Pro plans against your volume.
Braintrust helps AI product teams evaluate and observe agents: they run experiments against datasets before release, monitor traces in production and turn failures into new test cases.
Key functions
Experiments compare models and prompts with LLM, code or human scoring
Loop generates improved prompts, scorers and datasets
Natural language analysis of production traces with pattern detection
Compared with Arize Phoenix
Starts higher: from $249 per month, Arize Phoenix from $50 per month.
Strong in the same markets as Arize Phoenix: United States.
Check before buying: Data retention is 14 days on Starter and 30 days on Pro, so plan exports if you need longer history. Overage for data and scores is billed on top. SAML SSO is available on Enterprise only. Ask for data location and a data processing agreement, since neither is published.
Galileo evaluates and monitors generative AI applications and agents, from offline tests to production guardrails, for AI engineering teams that need to measure and control model quality.
Key functions
More than 20 out-of-the-box evaluations for RAG, agents, safety and security
Luna models evaluate all traffic at low latency and cost
Protect turns evaluation scores into runtime guardrails and agent controls
Compared with Arize Phoenix
Strong in the same markets as Arize Phoenix: United States.
Check before buying: The SaaS service processes data in the United States, so check the transfer basis for EU personal data or consider VPC or on-premises deployment on Enterprise. SSO is Enterprise-only. A public data processing agreement was not found, so request one.
Langfuse is an open-source platform for teams building LLM applications, combining prompt management with tracing, evaluations and analytics. It can be used as a managed cloud with US, EU or Japan regions or self-hosted for free.
Key functions
Versioned prompts with labels such as production, cached in the SDK
Playground for testing prompts in the browser
Experiments on datasets with scoring of results
Compared with Arize Phoenix
Can store data in the EU; Arize Phoenix states no EU option.
Headquartered in Germany, Arize Phoenix in United States.
Names 2 security certificates, Arize Phoenix 0.
Starts lower: from $29 per month, Arize Phoenix from $50 per month.
Check before buying: Choose the EU region if traces contain personal data from EU users, and sign the data processing addendum, which ClickHouse now publishes and which names Langfuse Cloud. Subprocessors are listed on the ClickHouse subprocessor page. SSO requires the Teams add-on on Pro or Enterprise. When traces include employee prompts, check co-determination rules in Germany.
All 4 alternatives by buying criteria
Arize Phoenix alternatives by price, trial, hosting and security
Not stated means we found no statement on the vendor's site. Data as of each profile's last check.
The market around Arize Phoenix: 5 tools for this task
80 % Publish a price (4/5)
80 % Free plan (4/5)
0 % Free trial (0/5)
40 % EU hosting option (2/5)
20 % Headquartered in Europe (1/5)
60 % Single sign-on (3/5)
Arize Phoenix is among the tools that publish a price. More than half of the vendors here publish prices, so you can compare list prices before the first demo.
Source: ai-toolfinder.com dataset, full profiles only.
Why teams look beyond Arize Phoenix
Arize Phoenix quotes prices on request. 3 of the alternatives below have a published pricing model.
Arize Phoenix states no EU hosting option. 2 alternatives can store data in the EU.
3 alternatives are strong in at least one of the same countries as Arize Phoenix, so local support and compliance should be comparable.
Arize Phoenix and the top 3 alternatives at a glance
It depends on your country and company size. In our data, PromptLayer, Braintrust and Galileo share the most strong markets with Arize Phoenix, so they are the closest fit if you work where Arize Phoenix is strong. Filter the list by country and size to narrow it down.
Is there a free alternative to Arize Phoenix?
PromptLayer, Braintrust and Langfuse offer a free plan or a free trial according to the vendors. Check the limits of free plans before you rely on them for employee data.
Which Arize Phoenix alternatives can host data in the EU?
PromptLayer and Langfuse can store customer data in the EU, according to the vendors. Ask for the data processing agreement (Art. 28 GDPR) and the list of subprocessors.
Which Arize Phoenix alternatives publish their prices?
PromptLayer, Braintrust and Langfuse show prices on their websites, for example PromptLayer from $49 per month and Braintrust from $249 per month. The others quote after a demo.
Are there European alternatives to Arize Phoenix?
Langfuse is headquartered in Europe. A European seat does not guarantee EU hosting, so check the data processing agreement and the list of subprocessors.
Which Arize Phoenix alternatives support single sign-on?
PromptLayer, Braintrust and Langfuse support single sign-on according to the vendors. Some include it only in higher plans, see the table above.
PromptLayer