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Langfuse vs Phase
Langfuse provides LLM observability, not secret management.
Which to pick
Pick Langfuse if you want…
- LLM observability & analytics
- Integrations with Python, TypeScript or Go (on Langfuse's list, not Phase's)
Pick Phase if you want…
- Encrypted secret management with AI agent integration
- Integrations with GitHub Actions, GitLab CI or Bitbucket Pipelines (on Phase's list, not Langfuse's)
Side by side
- What it is
- Langfuse:Langfuse is an open-source platform for tracing, evaluating and monitoring LLM applications and AI agents.
- Phase:Open source, end-to-end encrypted platform for managing application secrets and environment variables.
- Best for
- Langfuse:LLM observability & analytics
- Phase:Encrypted secret management with AI agent integration
- Who it’s for
- Langfuse:Developers building, debugging and scaling LLM-based apps and agents.
- Phase:Developers, DevOps teams and AI agents needing secure secret storage and rotation.
- Pricing
- Langfuse:Freemium
- Phase:Freemium
- Plans
- Langfuse:Hobby Free · Core $29 per month · Pro $199 per month · Enterprise $2499 per month
- Phase:Free $0 · Pro $10 / month / user per month · Enterprise $25 / month / user per month
- Open source
- Langfuse:Yes, 35,097 GitHub stars
- Phase:Yes, 924 GitHub stars
- Works with
- Langfuse:Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift
- Phase:GitHub Actions, GitLab CI, Bitbucket Pipelines, CircleCI, Jenkins, Vercel, Cloudflare, Railway
Langfuse features
- Hierarchical Traces. Capture every LLM call, tool invocation and retrieval step with filters for user, session, cost and latency.
- Prompt Management. Version, fetch, release and cache prompts separately from code with one-click deployments.
- Evaluation Engine. Run LLM-as-judge, heuristic or human-review evaluations on production data or experiments.
- Experiments & Datasets. Define test cases, run experiments and create golden datasets for continuous improvement.
- Dashboards & Alerts. Monitor cost, latency and quality via custom dashboards and automated alerts.
- Human Annotation. Collaborative human-in-the-loop workflows with annotation queues.
- Extensive Integrations. Supports Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift and 100+ agent frameworks and model providers.
- Self-hosted & Cloud Options. Available as hosted SaaS or self-hosted under MIT license.
Phase features
- End-to-end encryption. All secrets are encrypted client-side using XCHACHA20-POLY1305, X25519 and ARGON2ID.
- AI Agent Integration. Agents can request dynamic secrets, perform actions and have their activity audited.
- RBAC & Teams. Granular role-based access control and team-based permission scoping per environment.
- Secret Rotation & Dynamic Secrets. Automated rotation of credentials and on-demand short-lived secrets with lease management.
- Global Secret Search. Client-side searchable index of secrets across apps, environments and folders.
- Offline CLI Mode. CLI caches encrypted secrets locally for use when the network is unavailable.
- Integrations & Sync. Sync secrets to CI/CD pipelines, cloud providers, Kubernetes, Docker, Terraform and more.
- Audit Logs & Versioning. Full CRUD audit trail with point-in-time recovery and version history.
Langfuse vs Phase FAQ
Is Langfuse or Phase free?+
Langfuse has a free plan (Hobby); paid plans start at $29/month (Core). Phase has a free plan; paid plans start at $10/month per user (Pro).
Which is cheaper, Langfuse or Phase?+
Langfuse starts at $29/month (Core) and Phase starts at $10/month per user (Pro); the plans are billed differently, so compare what's included.
Is Langfuse or Phase open source?+
Yes, both are open source: Langfuse (langfuse/langfuse on GitHub) and Phase (phasehq/console on GitHub).
Do Langfuse and Phase integrate with the same tools?+
Their integration lists don't overlap: Langfuse lists Python, TypeScript, Go, Java and 10 more; Phase lists GitHub Actions, GitLab CI, Bitbucket Pipelines, CircleCI and 10 more.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.