A LangSmith Alternative that Takes LLM Observability to the Next Level

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.
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 ๐ก
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:
Logs per month | Helicone | LangSmith |
---|---|---|
10,000 logs | Free | Free |
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 ๐ข | $995.00 ๐ด |
15,000,000 logs | $2,321.50 ๐ข | $7,495.00 ๐ด |
Good to know ๐ก
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.
Helicone | LangSmith | |
---|---|---|
Best For | Teams looking for a holistic, user-friendly observability solution | Teams integrated with LangChain ecosystem |
Pricing | Starting at $20/user/month . Free trial and multiple tiers available | Starting at $39/user/month . Limited free plan, multiple tiers available |
Integration | Proxy-based (popular with developers) or async SDK options | Async SDK option only |
Strengths | Easy setup, real-time observability features like Sessions, intuitive UI, supports any LLM provider | Deep workflow tracing for lang-products, comprehensive evaluation tools |
Drawbacks | No built-in support for automatically scoring requests and experiments | Complex for simple tasks, layers of abstraction. Mixed opinions about production readiness, especially among experienced engineers. |
LLM Observability and Monitoring
Feature | Helicone | LangSmith |
---|---|---|
Open-Source | โ | โ |
Self-Hosting Ability to deploy on your own infrastructure | Highly flexible deployment options due to open-source nature | Only available to enterprise users |
Real-Time Observability Reflect updates instantly | โ
See real-time updates on the dashboard as your agent is running | โ No real-time dashboard updates due to caching mechanism |
Built-in Caching Cache common responses to reduce costs | โ | โ |
Prompt Management Tools to version, test, and optimize prompts | โ | โ |
LLM Workflow Tracing Track complex multi-step or agentic workflows | โ | โ |
Experimentation Tools to test and compare different approaches | โ | โ |
User Tracking Monitoring usage patterns by individual users | โ | ๐ Basic user tracking |
Security Features Key vault, rate limiting, threat detection | โ | ๐ Basic security features |
Supported LLMs Range of LLM providers compatible with the tool | โ
Wide provider support | ๐ Fewer models, optimized for LangChain ecosystem |
User Support Discord support, chat, email, dedicated Slack for Enterprise | โ | โ |
Security, Compliance, Privacy
Feature | Helicone | LangSmith |
---|---|---|
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 | โ | โ |
Rate Limiting Prevent excessive usage and manage costs | โ | โ |
Threat Detection Identify prompt injection and other security risks | โ | โ |
Data Protection Control sensitive data logging/selective logging | โ | โ |
HIPAA-Compliant Support for healthcare data privacy requirements | โ | โ |
GDPR-Compliant Compliance with EU data protection standards | โ | โ |
SOC 2 Certified Audited security and data handling practices | โ | โ |
Self-Hosting and Deployment Options
Option | Helicone | LangSmith |
---|---|---|
Manual Installation Direct installation on servers | โ | โ |
Kubernetes Container orchestration deployment. Helm charts available | โ | โ |
Docker Compose Multi-container deployment | โ | โ |
External Databases Connection to existing database systems | โ | โ |
Licensing Licensing model for self-hosting | โ
No license required | โ
Enterprise license required |
UI Comparison: Helicone vs LangSmith
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 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.
๐ก 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: |
---|---|
๐น The easiest possible setup | โฌฅ Deep integration with LangChain or LangGraph |
๐น Robust out-of-the-box security features (key vault, rate limiting, threat detection) | โฌฅ Detailed testing and evaluation tools |
๐น A tool your entire team can easily use (technical and non-technical) | โฌฅ A Python-first, developer-heavy workflow |
๐น Support for multiple LLM providers | โฌฅ 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!