LangSmith vs SigNoz: Which Should You Choose in 2026?
Choosing between LangSmith and SigNoz comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
LangSmith
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
Best for you if:
- • You need ai observability features specifically
- • Debug LLM applications with detailed agent tracing.
- • Monitor key business metrics with live dashboards and alerts.
SigNoz
Open-source APM and observability
Best for you if:
- • You want the higher-rated option (8.4/10 vs 0.0/10)
- • You need monitoring features specifically
- • SigNoz is an open-source observability platform for metrics and traces
- • It provides APM, logs, and distributed tracing in one tool
| At a Glance |  LangSmith | |
|---|---|---|
Price | Free + Paid | Free + Paid |
Best For | AI Observability | Monitoring |
Rating | —/100 | 84/100 |
| Feature | LangSmith | SigNoz |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| Editorial Score | — | 84 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | AI ObservabilityDebugging | MonitoringLog Management |
Understanding the Differences
Both LangSmith and SigNoz solve similar problems, but they approach them differently.LangSmith positions itself as "debug, monitor, and optimize your llm applications and ai agents with comprehensive observability." while SigNozfocuses on "open-source apm and observability". These differences matter depending on what you're trying to accomplish.
When to Choose LangSmith
LangSmith makes sense if you're looking for a budget-friendly option with a free tier solution.
When to Choose SigNoz
SigNoz is worth considering if you need a flexible option with both free and paid tiers tool. Scoring 84/100, it edges ahead in our evaluation.
Who Should Use What?
Bootstrapped or small team?
When every dollar counts, LangSmith lets you get started without pulling out your credit card.
We'd pick: LangSmith
Growing fast?
Your team doubled last quarter and you need tools that won't break when you add 50 more people. SigNoz is built for teams that are leveling up.
We'd pick: SigNoz
Enterprise with complex needs?
You need SSO, compliance certifications, and a support team that picks up the phone. Both have enterprise tiers—compare their security features.
We'd pick: SigNoz
Still not sure? Answer these 3 questions
How much can you spend?
Tight budget? Start free with LangSmith, upgrade when you're ready.
Do you care what other users think?
Both have similar review counts. Read a few before you commit.
Expert opinion or crowd wisdom?
Our team rated SigNoz higher (84/100). But the community has upvoted SigNoz more (0 votes). Pick your source of truth.
Key Takeaways
What SigNoz Does Better
- Higher overall score (84/100)
- Our recommendation for most use cases
Consider LangSmith If
- You want to start free and scale later
- Its specific features better match your workflow
- You prefer its interface or design approach
The Bottom Line
If we had to pick one, we'd go with SigNoz (84/100). But the honest answer is that "better" depends on your situation. SigNoz scores higher in our analysis, but LangSmith might be the right choice if its specific strengths align with what you need most. Take advantage of free trials to test both before committing.
Frequently Asked Questions
Is LangSmith or SigNoz better?
Based on our analysis, SigNoz scores higher with 84/100. LangSmith isfreemium while SigNoz is freemium. The best choice depends on your specific needs and budget. We recommend testing both with free trials if available.
Can I switch from LangSmith to SigNoz easily?
Migration difficulty varies. Check if both tools support data export/import in compatible formats. Some tools offer migration assistance or have integration partners who can help with the transition.
Do LangSmith and SigNoz offer free trials?
Most software in this category offers free trials or free tiers. LangSmith is freemium with a free tier.SigNoz is freemium with a free tier. Visit their websites for current trial offers.