# Free Alternative to LangSmith

Published January 1, 2026 · Updated August 10, 2026

The best free alternative to LangSmith ($39/month) is Claude DevTools. Install it with: `brew install --cask claude-devtools`.

## Best Free Alternatives to LangSmith for Mac

LangSmith remains LangChain’s flagship observability product in August 2026: deep agent traces, evals, monitoring, plus newer Deployment, Fleet, Engine, and Sandbox metering. Pricing is still seat-plus-usage. The free Developer tier is $0 with 5,000 base traces per month for a single seat—fine for experiments, easy to blow past in production. Plus is $39 per seat per month with 10,000 base traces included, then pay-as-you-go; compute/storage units bill at $1.50 per LCU and $1.00 per LSU. Enterprise is custom and is the only self-serve path to full enterprise controls. If you are shopping for free or open-source alternatives on a Mac, two tools matter more than marketing lists: Langfuse for real application tracing you can self-host, and Claude DevTools for local Claude Code session forensics. Langfuse is the honest LangSmith stand-in when you need multi-step agent traces, prompts, and evals without $39 seats. Claude DevTools is excellent and free via Homebrew, but it is not a LangSmith replacement for production LangChain apps—it only visualizes Claude Code logs under ~/.claude/. Be honest about the gap: no free tool matches LangSmith’s managed agent deployment stack, consolidated multi-provider cost UX, or turnkey team RBAC. Self-hosting Langfuse shifts cost from seats to ops time. Paying for Plus can still be rational once five engineers share production traces daily.

## Free alternatives

1. [Claude DevTools](https://bundl.run/apps/claude-devtools) — Visualise and analyse Claude Code session executions

   `brew install --cask claude-devtools`

## Verdict

As of August 2026, escape LangSmith’s Plus seat fees with Langfuse if you need application-level observability, and add Claude DevTools if you live in Claude Code. Keep LangSmith when managed agent deployment, enterprise controls, or zero-ops tracing matter more than license cost.

## FAQ

### is there a free version of langsmith

Yes. LangSmith’s Developer plan is free at $0/seat with 5,000 base traces per month and community support, limited to one seat. Production teams usually outgrow that quickly and move to Plus at $39/seat/month plus usage (LCU $1.50, LSU $1.00) or Enterprise.

### can claude devtools replace langsmith completely

No. Claude DevTools cannot replace LangSmith for multi-framework production monitoring. It only visualizes local Claude Code sessions. Use Langfuse (or keep LangSmith) for application traces; use Claude DevTools for coding-session forensics.

### how do i export traces from langsmith before canceling

LangSmith allows you to export trace data through the web interface. Navigate to your project settings, locate the Data Export section, and download traces in JSON or CSV format. Do this before canceling your subscription, as access to historical data is typically revoked upon cancellation. Exported data can be stored for compliance purposes or imported into other observability tools that support standard trace formats.

### what is the best free llm observability tool for mac

For production-style traces on a Mac developer workstation, self-hosted Langfuse is the best free alternative to LangSmith in August 2026. For Claude Code only, Claude DevTools is free via Homebrew and requires zero instrumentation. Neither fully replaces LangSmith’s managed Deployment/Fleet/Engine suite.

### does langsmith free tier have usage limits

Yes, the LangSmith Developer (free) tier is limited to 5,000 traces per month. A trace represents a single LLM call or agent execution step, so complex multi-turn conversations or agent workflows can consume this quota rapidly. Additional limits include 30-day data retention and no team collaboration features. Once you exceed 5,000 traces, you must either wait for the monthly reset or upgrade to a paid plan to continue logging.

### how does claude devtools work without api integration

Claude DevTools does not require API keys or code changes because it reads Claude Code's local session logs. The Claude CLI automatically writes detailed execution records to your local filesystem (typically ~/.claude/sessions/). Claude DevTools parses these existing log files and reconstructs the session timeline in a visual interface. This architecture means zero configuration—simply install the app and it discovers your session history automatically. The trade-off is that it only works with local Claude Code sessions, not remote API calls or deployed applications.

### is claude devtools safe to use with proprietary code

Yes, Claude DevTools processes everything locally on your Mac. Unlike cloud-based observability platforms, your code, session logs, and execution traces never leave your machine. The app reads files from your local filesystem and presents them in a native UI without any network transmission. This makes it suitable for debugging sessions involving proprietary or sensitive codebases. Always verify the app's permissions during installation, but its architecture inherently protects code privacy.

### can i use langsmith and claude devtools together

Yes, these tools serve different purposes and can complement each other. Use LangSmith for production monitoring of LangChain/LangGraph applications with real-time dashboards and team collaboration. Use Claude DevTools for deep analysis of Claude Code coding sessions where you need to understand file access patterns and context window usage. Many developers maintain LangSmith for their production AI services while using Claude DevTools for their daily development workflow with Claude Code, optimizing costs by minimizing LangSmith seat licenses.

### what observability features are missing in free alternatives

Free alternatives typically lack several enterprise features found in LangSmith: real-time hosted dashboards accessible to entire teams, automated evaluation datasets with scoring, A/B testing capabilities for prompt variants, multi-framework support (LangChain, OpenAI, custom APIs), role-based access control and security compliance features, and consolidated cost tracking across multiple LLM providers. Free tools also generally offer limited data retention and no SLA guarantees.

### will switching from langsmith save money for small teams

Often yes for small teams: five Plus seats are $195/month before trace overages. Self-hosted Langfuse removes seats but adds infra and ops. Claude DevTools alone only saves money if your pain is Claude Code debugging, not production agent monitoring.

### is langfuse a real free alternative to langsmith in 2026

Yes for observability. Langfuse’s MIT core is free to self-host with traces, prompts, datasets, and evals. LangSmith still wins on managed agent deployment products and LangChain-native convenience. Cloud Langfuse has its own paid tiers if you do not self-host.

## Sources

- [LangSmith Plans and Pricing](https://www.langchain.com/pricing)
- [LangSmith Observability Docs](https://docs.langchain.com/langsmith/observability)
- [Langfuse — open-source LLM engineering](https://langfuse.com/)
- [Langfuse: LangSmith Alternative Guide](https://langfuse.com/resources/engineering/langsmith-alternative)
- [Claude DevTools GitHub](https://github.com/matt1398/claude-devtools)
- [Homebrew Cask: claude-devtools](https://formulae.brew.sh/cask/claude-devtools)
- [Claude Code Documentation](https://code.claude.com/docs/)

## Related

- [Claude DevTools vs CodexMonitor](https://bundl.run/compare/claude-devtools-vs-codexmonitor)
- [Claude DevTools vs supacode](https://bundl.run/compare/supacode-vs-claude-devtools)

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