LangSmith
AI Agent & LLM Observability Platform
VS
PlayHT
Permanently shut down on December 31, 2025.
Detailed comparison
Criteria
LangSmith
PlayHT
Pricing
Freemium
Enterprise
Plans & pricing
Developer: Free, Team: $39/mo, Enterprise: Custom
Free Plan: Free, Creator Plan: $31.2/yr, Creator Plan (Monthly): $39/mo, Unlimited Plan: $49/yr, Unlimited Plan (Monthly): $99/mo, Pro Plan: $99/mo, Enterprise Plan: Custom
Free trial
No
Yes
Audience
b2b
b2b
Platforms
Web
—
API
Yes
No
Open Source
Proprietary
Proprietary
Integrations
Pagerduty
—
Categories
Data Science, Dev Tools
Audio, Voice
Popularity
Very High
Very High
Description
LangSmith is a complete AI agent and LLM observability platform. It offers tracing and real-time monitoring to help developers debug agents, find fail...
PlayHT, an advanced AI voice platform, was acquired by Meta and permanently shut down on December 31, 2025. It previously offered high-quality, ultra-...
Pricing
LangSmith
Freemium
PlayHT
Enterprise
Plans & pricing
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
PlayHT
Free Plan: Free, Creator Plan: $31.2/yr, Creator Plan (Monthly): $39/mo, Unlimited Plan: $49/yr, Unlimited Plan (Monthly): $99/mo, Pro Plan: $99/mo, Enterprise Plan: Custom
Free trial
LangSmith
No
PlayHT
Yes
Audience
LangSmith
b2b
PlayHT
b2b
Platforms
LangSmith
Web
PlayHT
—
API
LangSmith
Yes
PlayHT
No
Open Source
LangSmith
Proprietary
PlayHT
Proprietary
Integrations
LangSmith
Pagerduty
PlayHT
—
Categories
LangSmith
Data Science, Dev Tools
PlayHT
Audio, Voice
Popularity
LangSmith
Very High
PlayHT
Very High
Description
LangSmith
LangSmith is a complete AI agent and LLM observability platform. It offers tracing and real-time monitoring to help developers debug agents, find fail...
PlayHT
PlayHT, an advanced AI voice platform, was acquired by Meta and permanently shut down on December 31, 2025. It previously offered high-quality, ultra-...
Key differentiators
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
PlayHT
- Advanced AI voice platform
- Ultra-realistic text-to-speech
- Voice cloning capabilities
Other comparisons
FAQ: LangSmith vs PlayHT
LangSmith: AI Agent & LLM Observability Platform. PlayHT: Permanently shut down on December 31, 2025.. Both tools take different approaches to address similar needs.
LangSmith offers a freemium plan, while PlayHT is a contact tool.
The best choice between LangSmith and PlayHT depends on your specific needs. Compare their features, pricing, and target audience on this page to find the tool that best fits your use case.
Both are primarily designed for individuals. The choice depends on which specific features you need.
Based on our data, LangSmith currently enjoys greater popularity. However, popularity isn't the only factor — compare features to find the right tool for your needs.