Portkey vs LangSmith

Side-by-side — pricing, strengths, tradeoffs, and fit.

Portkey

LLM observability and an AI gateway — logging, routing, and guardrails.

LangSmith

Unified platform for evaluating and monitoring LLM applications with HITL capabilities.

At a glance

Free TierEnterprise
◐ Growing·From Usage-based
· Not enough data·From Contact sales

Overview

One-liner

LLM observability and an AI gateway — logging, routing, and guardrails.

One-liner

Unified platform for evaluating and monitoring LLM applications with HITL capabilities.

Maturity

Growing

Maturity

Not enough data

Open source

✕ No

Open source

✕ No

Pricing

Free tier

✓ Available

Free tier with monthly request allowance

Free tier

✕ None

Starts at

Usage-based

Starts at

Contact sales

Model

Usage-based

Model

Flat rate

Enterprise

✓ Available

Enterprise

✕ None

Best for

✓ Best for

Monitoring LLM API calls and costsLogging, metrics, and routing for LLMs
Multi-provider LLM resilienceFallbacks and caching

✓ Best for

Development teams working on complex LLM applications that require detailed performance monitoring and human oversight
Projects where HITL capabilities are crucial for the development lifecycle of AI models
Organizations aiming to enhance collaboration among developers, data scientists, and other stakeholders in the evaluation process

Not ideal for

✕ Not for

—

✕ Not for

Teams needing real-time streaming capabilities (LangSmith is optimized for batch processing)
Budget-constrained projects where cost-efficiency is a primary concern due to its paid model

Strengths

↑ Strengths

AI gateway + observability
Multi-provider routing/fallbacks
Guardrails and caching

↑ Strengths

Unified platform for LLM application evaluation and monitoring
Human In The Loop (HITL) collaboration capabilities
Comprehensive logging and performance tracking features
Integration with LangChain framework for seamless workflow

Weaknesses

↓ Weaknesses

Adds a proxy hop
Younger ecosystem

↓ Weaknesses

Limited language support beyond Python
Expensive at scale for enterprise usage
Vendor lock-in due to proprietary nature
Full Portkey profile →Full LangSmith profile →