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LangChain vs Steer SDK
Short answer: Pick LangChain if you want end-to-end agent engineering platform; pick Steer SDK if you want deterministic guardrails for AI agents. LangChain has a free plan, paid from $39/month per user; Steer SDK is free and open source.
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
- Starting price
- LangChain:$39/month per user (Plus)
- Steer SDK:Free
- Free plan or trial
- LangChain:Free plan (Developer) · Free trial
- Steer SDK:Free to use
- 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
What is the difference between LangChain and Steer SDK?+
LangChain is a framework for building LLM apps, not a runtime guardrail layer.
Should I use LangChain or Steer SDK?+
Pick LangChain if you want end-to-end agent engineering platform or LLM app development framework. Pick Steer SDK if you want deterministic guardrails for AI agents or a free, open-source tool.
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.