Tools
Arize Phoenix vs Langfuse
Arize Phoenix or Langfuse? Their plans monthly and yearly, the capabilities their makers state, security and latest updates, side by side — read from the makers' own pages.
In inglese
In short
- Both: Command line, Self-hosted, API, Traces and evaluates
- Only Langfuse states: Choice of models, Official SDKs
Arize Phoenix
Open-source platform for tracing, evaluating, and improving AI agents and LLM applications.
Plans
AX Free
Free
- 10 issues per month
- 25k spans per month
- 1 GB per month
- 15 days retention
- SaaS deployment
- Unlimited users and evals
AX Pro
- $50 per month
- 25 issues per month
- 50k spans per month
- 10 GB per month
- 30 days retention
- SaaS deployment
- Unlimited users and evals
AX Enterprise
Price on request
- Unlimited issues
- Custom span volume
- Custom ingestion volume
- Custom retention
- SaaS or Self-Hosted deployment
- Unlimited users and evals
Prices checked 2026-09-25 on the maker’s page.
Capabilities
- Command line — “Get Started Locally $ uvx arize-phoenix serve” source
- Self-hosted — “Self-host Phoenix and keep sensitive data on your own infrastructure.” source
- API — “Docs Quickstarts, API reference, and integration guides” source
- Traces and evaluates — “Phoenix shows every step your agent takes so you know what went wrong.” source
Security
- SOC 2 Type II — “Arize AI Announces SOC 2 Type II Certification” source
- SOC 2 — “Arize AI Announces SOC 2 Type II Certification” source
- ISO 27001 — “ISO/IEC 27001 Certified” source
- GDPR — “GDPR Compliant” source
- HIPAA — “HIPAA Compliant” source
- Data kept in the EU — “Arize AI: Support for EU Data Residency” source
Latest updates
- Get Alyx help tailored to your experience
Alyx adapts how it helps based on your experience level in each part of Arize AX.
- Pick up where you left off with Alyx long-term memory
Alyx remembers context across conversations, including preferences, goals, project and asset learnings, team conventions, and decisions.
- Add and annotate entire sessions and traces in annotation queues
Send sessions and traces to an annotation queue and review them at session or trace granularity.
Langfuse
Langfuse traces, evaluates, and monitors AI agents and LLM applications, with prompt management, experiments, and cost analytics.
Plans
Hobby
Free
- 50k units / month included
- 30 days data access
- 2 users
- Community support via GitHub
- All platform features (with limits)
Core
- $29 / month
- $8/100k units
- 100k units / month included
- 90 days data access
- Unlimited users
- In-app support
- Everything in Hobby
Pro
- $199 / month
- $8/100k units
- 100k units / month included
- 3 years data access
- Data retention management
- Unlimited annotation queues
- High rate limits
- Prioritized in-app support
Enterprise
- $2499 / month
- $8/100k units
- 100k units / month included
- Audit Logs
- SCIM API
- Custom rate limits
- Uptime SLA
- Named lead support engineer
Prices checked 2026-09-25 on the maker’s page.
Capabilities
- Command line — “Langfuse CLI Full API access from the terminal for agent workflows, scripts, and CI/CD.” source
- Choice of models — “Test prompts on real production inputs and compare models side-by-side.” source
- Self-hosted — “Self-host at scale” source
- API — “REST APIs for everything” source
- Official SDKs — “Best-in-class SDKs: Native SDKs for Python and JavaScript” source
- Traces and evaluates — “Trace, evaluate, and improve AI agents with one open platform.” source
Security
- SOC 2 Type II — “The production service is based on the same open-source Langfuse codebase, is covered by SOC 2 Type II and ISO 27001 audits, and undergoes annual third-party penetration tests.” source
- SOC 2 — “We take active steps to demonstrate our commitment to data security and privacy such as annual SOC2 Type 2 and ISO27001 audits as well as External Penetration Tests.” source
- ISO 27001 — “The production service is based on the same open-source Langfuse codebase, is covered by SOC 2 Type II and ISO 27001 audits, and undergoes annual third-party penetration tests.” source
- GDPR — “Langfuse is GDPR compliant, and offers data retention, data masking and data deletion capabilities to manage the processing of personal data .” source
- HIPAA — “We offer a DPA , provide a HIPAA-ready region , and adhere to our Privacy Policy .” source
- Data kept in the EU — “Langfuse Cloud – fully-managed SaaS (multi-tenant) with US, EU, Japan, and HIPAA data regions” source
Latest updates
- Langfuse v4 is live: faster at scale, with more ways to search, monitor, and evaluate
Initial table loads drop from seconds to milliseconds, and dashboards over longer time ranges load at least 10x faster.