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LangChain vs Steer SDK
LangChain is a framework for building LLM apps, not a runtime guardrail layer.
LangChainFramework for building LLM apps and agents
Steer SDKStop Debugging. Start Teaching. The Active Reliability Layer for AI Agents. Which to pick
Pick LangChain if you want…
- End-to-end agent engineering platform
- LLM app development framework
Pick Steer SDK if you want…
- Deterministic guardrails for AI agents
- A free, open-source tool
Side by side
- What it is
- LangChain:LangChain is an open platform for building, testing, deploying, monitoring, and governing LLM agents.
- Steer SDK:Steer SDK is an open-source Python library that adds deterministic guardrails to AI agents to catch hallucinations and enforce reliability.
- Best for
- LangChain:End-to-end agent engineering platform
- Steer SDK:Deterministic guardrails for AI agents
- Who it’s for
- LangChain:Developers and teams building AI agents and LLM-powered applications.
- Steer SDK:Developers building autonomous LLM agents who need runtime safety and observability.
- Pricing
- LangChain:Freemium
- Steer SDK:Open source
- Plans
- LangChain:Developer $0 per seat per month · Plus $39 per seat per month
- Steer SDK:—
- Open source
- LangChain:Yes, 147,359 GitHub stars
- Steer SDK:Yes, 134 GitHub stars
- Works with
- LangChain:—
- Steer SDK:Python, PydanticAI
LangChain features
- Build agents fast. Start with proven patterns, customize harness, context, memory and model choice.
- Trace-based testing. Debug runs with step-by-step tracing and query complex traces instantly.
- Managed deployments. Deploy long-running agents with serverless or dedicated sandboxes and 30+ endpoints.
- Production monitoring. Online evals, dashboards and alerts track quality, cost, latency and errors.
- Feedback loop engine. Automatically detect issues, diagnose root causes and feed fixes back into evals.
- Governance controls. Enforce cost limits, data redaction and human approval via LLM Gateway.
Steer SDK features
- Low-latency sidecar. Adds verification with less than 5 ms overhead by running in-process.
- Fail-safe design. Configurable behavior on internal errors to prioritize uptime.
- Zero data exfiltration. Local-first architecture ensures prompts never leave your network.
- Audit-ready logging. Every blocked response is logged with a deterministic reason code.
- Framework patching. Zero-touch reliability for frameworks like PydanticAI via a central policy file.
- Decorator sidecar. Manual control using @capture decorator to inject taught rules at runtime.
LangChain vs Steer SDK FAQ
Is LangChain or Steer SDK free?+
LangChain has a free plan (Developer); paid plans start at $39/month per user (Plus). Steer SDK is free and open source.
Which is cheaper, LangChain or Steer SDK?+
Steer SDK is free, so it costs less. LangChain starts at $39/month per user (Plus).
Is LangChain or Steer SDK open source?+
Yes, both are open source: LangChain (langchain-ai/langchain on GitHub, MIT license) and Steer SDK (imtt-dev/steer on GitHub, MIT license).
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.