AssemblyAI
AI models to transcribe and understand speech
VS
LangSmith
AI Agent & LLM Observability Platform
Detailed comparison
Criteria
AssemblyAI
LangSmith
Pricing
Freemium
Freemium
Plans & pricing
Free: Free, Enterprise: Custom
Developer: Free, Team: $39/mo, Enterprise: Custom
Free trial
Yes
No
Audience
b2b
b2b
Platforms
Web, Api
Web
API
Yes
Yes
Open Source
Proprietary
Proprietary
Integrations
—
Pagerduty
Categories
Voice, Dev Tools
Data Science, Dev Tools
Popularity
Very High
Very High
Description
AssemblyAI offers industry-leading Speech AI models and APIs to accurately transcribe speech to text and extract valuable insights from voice data. De...
LangSmith is a complete AI agent and LLM observability platform. It offers tracing and real-time monitoring to help developers debug agents, find fail...
Pricing
AssemblyAI
Freemium
LangSmith
Freemium
Plans & pricing
AssemblyAI
Free: Free, Enterprise: Custom
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
Free trial
AssemblyAI
Yes
LangSmith
No
Audience
AssemblyAI
b2b
LangSmith
b2b
Platforms
AssemblyAI
Web, Api
LangSmith
Web
API
AssemblyAI
Yes
LangSmith
Yes
Open Source
AssemblyAI
Proprietary
LangSmith
Proprietary
Integrations
AssemblyAI
—
LangSmith
Pagerduty
Categories
AssemblyAI
Voice, Dev Tools
LangSmith
Data Science, Dev Tools
Popularity
AssemblyAI
Very High
LangSmith
Very High
Description
AssemblyAI
AssemblyAI offers industry-leading Speech AI models and APIs to accurately transcribe speech to text and extract valuable insights from voice data. De...
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...
Features
AssemblyAI
Speech-to-Text
Speaker Diarization
Automatic Language Detection
Automatic Text Formatting
Audio Intelligence
LangSmith
Cost tracking
Online LLM-as-judge and code evals
Tool and agent trajectory monitoring
Webhook and Pagerduty alerts
Message threading for multi-turn chat interactions
Templates for error analysis
Key differentiators
AssemblyAI
- Industry-leading Speech AI
- Advanced audio intelligence
- Real-time transcription & insights
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
Other comparisons
FAQ: AssemblyAI vs LangSmith
AssemblyAI: AI models to transcribe and understand speech. LangSmith: AI Agent & LLM Observability Platform. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. AssemblyAI is freemium and LangSmith is freemium.
The best choice between AssemblyAI and LangSmith 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.
AssemblyAI offers: Speech-to-Text, Speaker Diarization, Automatic Language Detection, Automatic Text Formatting. LangSmith offers: Cost tracking, Online LLM-as-judge and code evals, Tool and agent trajectory monitoring, Webhook and Pagerduty alerts.
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.