A LangSmith Alternative that Takes LLM Observability to the Next Level

Lina Lam's headshotLina Lamยท Mar 27, 2025

Both Helicone and LangSmith are capable, powerful DevOps platforms used by enterprises and developers to develop, deploy, and monitor their LLM applications and gain full visibility into their development.

But which platform is better for production? Let's compare.

Helicone vs. LangSmith, which is better?

What Makes Helicone Different?

1. Helicone is Open-Source

Helicone is fully open-source and free to start. Companies can also self-host Helicone within their infrastructure. This ensures that you have full control over the application, flexibility, and customization tailored to specific business needs.

2. Ease of Integration

Developers often choose Helicone for our simple proxy setup. Simply by changing the base URL, you can start logging everything with any providers.

https://oai.helicone.ai/v1 # new baseURL
https://api.openai.com/v1 # old baseURL

Being a proxy, Helicone offers caching, prompt threat detection, key vault, rate limiting, and other useful gateway features.

However, if you don't want to place Helicone in your critical path, you can use our async logging method.

Latency Impact & Reliability ๐Ÿ’ก

Helicone is built on the edge using Cloudflare Workers to minimize time to response. This adds only ~50 ms for about 95% of the world's Internet-connected population. We're also proud of our 99.99% uptime in the last year.

3. Scalable Usage-Based Pricing

Helicone is more cost-effective than LangSmith for two reasons.

First, we operate on a volumetric pricing model that gets cheaper the more requests you have. Second, our paid tier starts at $20/seat/month, which gets you access to all features in Helicone, compared to $39/seat/month for LangSmith. Our seat-based pricing caps at $200/mo for fast-growing teams needing unlimited seats.

Here's how the pricing scales between Helicone and LangSmith:

Helicone vs. LangSmith Pricing

Logs per monthHeliconeLangSmith
10,000 logsFreeFree
25,000 logs$24.00$7.50
50,000 logs$44.00$20.00
100,000 logs$61.50$45.00
2,000,000 logs$631.50 ๐ŸŸข$995.00 ๐Ÿ”ด
15,000,000 logs$2,321.50 ๐ŸŸข$7,495.00 ๐Ÿ”ด

Good to know ๐Ÿ’ก

If we don't have a feature you need, there's a good chance we are building it already. We're always listening to feedback and adding features that help you get the most out of your LLM applications.

Comparing Helicone and LangSmith

As a platform that focuses on optimizing your entire LLM lifecycle, Helicone isn't just a great alternative to LangSmith. It also outperforms in scalability and reliability compared to tools like Langfuse and Portkey.

HeliconeLangSmith
Best ForTeams looking for a holistic, user-friendly observability solutionTeams integrated with LangChain ecosystem
PricingStarting at $20/user/month. Free trial and multiple tiers availableStarting at $39/user/month. Limited free plan, multiple tiers available
IntegrationProxy-based (popular with developers) or async SDK optionsAsync SDK option only
StrengthsEasy setup, real-time observability features like Sessions, intuitive UI, supports any LLM providerDeep workflow tracing for lang-products, comprehensive evaluation tools
DrawbacksNo built-in support for automatically scoring requests and experimentsComplex for simple tasks, layers of abstraction. Mixed opinions about production readiness, especially among experienced engineers.

LLM Observability and Monitoring

FeatureHeliconeLangSmith
Open-Sourceโœ…โŒ
Self-Hosting
Ability to deploy on your own infrastructure
Highly flexible deployment options due to open-source natureOnly available to enterprise users
Real-Time Observability
Reflect updates instantly
โœ…
See real-time updates on the dashboard as your agent is running
โŒ
No real-time dashboard updates due to caching mechanism
Built-in Caching
Cache common responses to reduce costs
โœ…โŒ
Prompt Management
Tools to version, test, and optimize prompts
โœ…โœ…
LLM Workflow Tracing
Track complex multi-step or agentic workflows
โœ…โœ…
Experimentation
Tools to test and compare different approaches
โœ…โœ…
User Tracking
Monitoring usage patterns by individual users
โœ…๐ŸŸ 
Basic user tracking
Security Features
Key vault, rate limiting, threat detection
โœ…๐ŸŸ 
Basic security features
Supported LLMs
Range of LLM providers compatible with the tool
โœ…
Wide provider support
๐ŸŸ 
Fewer models, optimized for LangChain ecosystem
User Support
Discord support, chat, email, dedicated Slack for Enterprise
โœ…โœ…

Security, Compliance, Privacy

FeatureHeliconeLangSmith
Data Retention
Control how long data is stored
1 month (Free)
3 months (Pro/Team)
Forever (Enterprise)
From 14 to 400 days
(longer retention costs more)
API Key Management
Securely store and manage provider credentials
โœ…โœ…
Rate Limiting
Prevent excessive usage and manage costs
โœ…โŒ
Threat Detection
Identify prompt injection and other security risks
โœ…โŒ
Data Protection
Control sensitive data logging/selective logging
โœ…โœ…
HIPAA-Compliant
Support for healthcare data privacy requirements
โœ…โœ…
GDPR-Compliant
Compliance with EU data protection standards
โœ…โœ…
SOC 2 Certified
Audited security and data handling practices
โœ…โœ…

Self-Hosting and Deployment Options

OptionHeliconeLangSmith
Manual Installation
Direct installation on servers
โœ…โŒ
Kubernetes
Container orchestration deployment. Helm charts available
โœ…โœ…
Docker Compose
Multi-container deployment
โœ…โœ…
External Databases
Connection to existing database systems
โœ…โœ…
Licensing
Licensing model for self-hosting
โœ…
No license required
โœ…
Enterprise license required

UI Comparison: Helicone vs LangSmith

Helicone Dashboard Image

We believe that observability should be simple and intuitive at Helicone, that's why we designed our platform to be easy to use and understand. It's reflected in both our UI and workflow that are designed to make you more productive as a developer.

What's great is that you don't need to be a data analyst to understand the dashboard. It's designed for a wide range of technical experiences.

Integration Example

Helicone's proxy integration requires minimal code changes. Here's an example of integration with OpenAI:

import OpenAI from "openai";

const openai = new OpenAI({
  apiKey: OPENAI_API_KEY,
  baseURL: "https://oai.helicone.ai/v1",
  defaultHeaders: { "Helicone-Auth": `Bearer ${HELICONE_API_KEY}` }
});

See docs for Anthropic, Gemini and more.

LangSmith Dashboard

LangSmith Dashboard Image

LangSmith specializes in tracing complex AI workflows, particularly those built with LangChain (built by the same team). LangSmith organizes everything into:

  • Runs: Individual operations (like a single LLM call)
  • Threads: Groups of related operations that fulfill a user request
  • Projects: Collections of traces for different parts of your application

LangSmith's interface is more technical than Helicone's but provides somewhat deeper visibility into complex workflows.

๐Ÿ’ก Please note:

LangSmith's dashboard is customizable if you want to build your own analytics from scratch. If you want a pre-built dashboard with the most important LLM metrics, Helicone might be a better choice for you.

Integration Approach

LangSmith uses an async SDK-based approach. This involves using function decorators to trace your code. For example:

from langsmith import traceable

@traceable
def process_query(question):
    # Application logic
    return response

This method requires more code changes and is more technical but gives you detailed insights into each function.

Which platform should you choose?

We hear our customers say that their experience of monitoring LLM application in Helicone is intuitive and integrates well into any LLM observability tech stack. LangSmith is a great tool, and there are some things we would recommend them over Helicone for, such as if you're an enterprise that is in the LangChain ecosystem.

We've distilled the key features of Helicone and LangSmith into a table to help you decide which platform is best for your needs:

Choose Helicone if you need:Choose LangSmith if you need:
๐Ÿ”น The easiest possible setupโฌฅ Deep integration with LangChain or LangGraph
๐Ÿ”น Robust out-of-the-box security features (key vault, rate limiting, threat detection)โฌฅ Detailed testing and evaluation tools
๐Ÿ”น A tool your entire team can easily use (technical and non-technical)โฌฅ A Python-first, developer-heavy workflow
๐Ÿ”น Support for multiple LLM providersโฌฅ Comfort with a closed-source solution

We recommend trying out both platforms to see which one is better for you. If you have any questions, please don't hesitate to reach out!

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Frequently Asked Questions

How hard is it to add Helicone or LangSmith to my existing app?

Helicone can be added by changing a single line of code (for the proxy approach) or using their SDK for background async logging. LangSmith requires adding decorators to your functions and using their SDK throughout your code.

Will these tools help me save money on my LLM costs?

Helicone has built-in caching that can significantly reduce costs by reusing responses for similar requests. LangSmith doesn't have any features particularly geared towards cost saving besides basic cost tracking.

Can I host these tools on my own servers?

Yes, both offer self-hosting. Helicone gives you more options (manual setup, Kubernetes, Docker, cloud deployment) and can be hosted for free, while LangSmith focuses on Kubernetes and Docker and requires an Enterprise subscription.

Do I need to be a developer to understand the dashboards?

Helicone's dashboard is designed to be accessible to both technical and non-technical users. LangSmith has a more technical focus and assumes some development knowledge.

Which one has better security?

Helicone offers more security features, including key management, rate limiting, and protection against prompt injection attacks. LangSmith provides basic security controls like access management.

Can these tools handle high traffic?

Helicone is built on a highly distributed cloud infrastructure designed for massive scale. LangSmith is more centralized, however, and may face challenges with extremely high volumes.

Do they work with all LLM providers?

Helicone works with virtually all LLM providers, while LangSmith supports a more limited number of providers but works better within the LangChain ecosystem.


Questions or feedback?

Are the information out of date? Please raise an issue or contact us, we'd love to hear from you!