LangSmith alternatives
The 8 closest alternatives to LangSmith, which has a free tier. Each one below does roughly the same job from a different angle.
Why people move off LangSmith
- SDK-based integration requires more setup than proxy-based tools like Helicone
- Free tier of 5,000 traces per month is limiting for active development
- UI can feel complex for teams that only need basic cost and latency monitoring
Worth weighing against what it does well: deep native integration with LangChain and LangGraph for zero-config tracing
The 8 best LangSmith alternatives
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LLM observability and cost monitoring for production AI applications
Has a free tier, where LangSmith has a free tier. Overlaps with LangSmith on developer-tools and api.
Best for: Production LLM apps that need cost visibility and per-user tracking; Teams debugging latency spikes and unexpected model failures
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Open-source LLM observability with full self-hosting and production-ready tracing
Has a free tier, where LangSmith has a free tier. Overlaps with LangSmith on developer-tools and api.
Best for: Teams with GDPR or data residency requirements needing a self-hosted solution; Open-source-first organizations that want auditable infrastructure
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AI gateway and observability platform: route, monitor, and control LLM API calls
Has a free tier, where LangSmith has a free tier. Overlaps with LangSmith on developer-tools and api.
Best for: Production LLM apps needing multi-provider redundancy and failover; Teams controlling LLM API access across multiple teams or services
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Speech-to-text API and audio intelligence platform with LLM-powered analysis via LeMUR
Has a free tier, where LangSmith has a free tier.
Best for: Meeting and call recording with automatic summarization and action item extraction via LeMUR; Call center quality analysis and compliance monitoring at scale
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Speech-to-text API and voice agent platform built for real-time low-latency applications
Has a free tier, where LangSmith has a free tier.
Best for: Real-time transcription for customer service calls, sales calls, and meeting recording; Voice agent pipelines where end-to-end latency under one second is required
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Low-latency voice agent platform with emotion-adaptive dialogue for sales and support
Starts at $0.07/mo, where LangSmith has a free tier.
Best for: Outbound sales calls with adaptive tone adjustment based on prospect reaction; Inbound customer support for e-commerce and SaaS with CRM integration
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Developer-focused voice AI platform for building production-grade voice agents via API
Has a free tier, where LangSmith has a free tier.
Best for: Customer support bots handling inbound calls with full CRM integration via function calling; Outbound appointment reminder and confirmation calls with natural conversation flow
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Anthropic's conversational AI with Claude 4 Opus, Sonnet, and Haiku
Has a free tier, with paid plans from $20/mo, where LangSmith has a free tier.
Best for: Knowledge workers doing research, writing, and analysis daily; Developers using Claude's reasoning for code review and architecture discussions
Side by side
| Tool | Pricing | Free tier | Platforms |
|---|---|---|---|
| LangSmith | Free tier | Yes | Web, API |
| Helicone | Free tier | Yes | Web, API |
| Langfuse | Free tier | Yes | Web, API, Self-hosted |
| Portkey | Free tier | Yes | Web, API, Self-hosted |
| AssemblyAI | Free tier | Yes | API, Python SDK, JavaScript SDK, Java SDK, Ruby SDK, Go SDK, C# SDK |
| Deepgram | Free tier | Yes | API, Python SDK, JavaScript SDK, Go SDK, .NET SDK |
| Retell AI | From $0.07/mo | No | API, Web, Phone |
| Vapi | Free tier | Yes | API, Web, Phone |
| Claude (web/app) | Free tier, then $20/mo | Yes | Web, macOS, Windows, iOS, Android |