LangSmith
AI Agent & LLM Observability Platform
VS
Spark Mail
Smart. Focused. Email.
Detailed comparison
Criteria
LangSmith
Spark Mail
Pricing
Freemium
Freemium
Plans & pricing
Developer: Free, Team: $39/mo, Enterprise: Custom
Free: Free, Plus: $10/mo, Spark +AI: $20/mo, Enterprise: Custom
Free trial
No
No
Audience
b2b
b2c
Platforms
Web
Desktop, Ios, Android
API
Yes
No
Open Source
Proprietary
Proprietary
Integrations
Pagerduty
—
Categories
Dev & Tech, information technology & services, Apps
Communication, information technology & services, Email management
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...
Spark helps you take your inbox under control. It allows you to instantly see what’s important and quickly clean up the rest.
Pricing
LangSmith
Freemium
Spark Mail
Freemium
Plans & pricing
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
Spark Mail
Free: Free, Plus: $10/mo, Spark +AI: $20/mo, Enterprise: Custom
Free trial
LangSmith
No
Spark Mail
No
Audience
LangSmith
b2b
Spark Mail
b2c
Platforms
LangSmith
Web
Spark Mail
Desktop, Ios, Android
API
LangSmith
Yes
Spark Mail
No
Open Source
LangSmith
Proprietary
Spark Mail
Proprietary
Integrations
LangSmith
Pagerduty
Spark Mail
—
Categories
LangSmith
Dev & Tech, information technology & services, Apps
Spark Mail
Communication, information technology & services, Email management
Popularity
LangSmith
Very High
Spark Mail
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...
Spark Mail
Spark helps you take your inbox under control. It allows you to instantly see what’s important and quickly clean up the rest.
Features
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
Spark Mail
Smart Inbox
AI Assistant
Gatekeeper
Priority Email
Home Screen
Calendar & Meeting Notes
Key differentiators
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
Spark Mail
- AI Assistant & Smart Inbox
- Prioritize important emails
- Inbox control & decluttering
Other comparisons
FAQ: LangSmith vs Spark Mail
LangSmith: AI Agent & LLM Observability Platform. Spark Mail: Smart. Focused. Email.. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. LangSmith is freemium and Spark Mail is freemium.
The best choice between LangSmith and Spark Mail 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.
LangSmith is primarily designed for individuals, while Spark Mail is built for individuals.
LangSmith offers: Cost tracking, Online LLM-as-judge and code evals, Tool and agent trajectory monitoring, Webhook and Pagerduty alerts. Spark Mail offers: Smart Inbox, AI Assistant, Gatekeeper, Priority Email.
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.