LangSmith
AI Agent & LLM Observability Platform
VS
Unreal Speech
Cheapest Text-to-Speech API
Detailed comparison
Criteria
LangSmith
Unreal Speech
Pricing
Freemium
Freemium
Plans & pricing
Developer: Free, Team: $39/mo, Enterprise: Custom
Free: Free, Basic: $4.99/mo, Starter: $10/mo, High Volume API: $49/mo, Advanced API: $499/mo, Pro: $1499/mo, Enterprise: $4999/mo
Free trial
No
No
Audience
b2b
b2b
Platforms
Web
Web, Api
API
Yes
Yes
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...
Unreal Speech offers a production-ready Text-to-Speech (TTS) API designed to cut costs significantly. It delivers ultra-low latency, streaming audio i...
Pricing
LangSmith
Freemium
Unreal Speech
Freemium
Plans & pricing
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
Unreal Speech
Free: Free, Basic: $4.99/mo, Starter: $10/mo, High Volume API: $49/mo, Advanced API: $499/mo, Pro: $1499/mo, Enterprise: $4999/mo
Free trial
LangSmith
No
Unreal Speech
No
Audience
LangSmith
b2b
Unreal Speech
b2b
Platforms
LangSmith
Web
Unreal Speech
Web, Api
API
LangSmith
Yes
Unreal Speech
Yes
Open Source
LangSmith
Proprietary
Unreal Speech
Proprietary
Integrations
LangSmith
Pagerduty
Unreal Speech
—
Categories
LangSmith
Data Science, Dev Tools
Unreal Speech
Audio, Voice
Popularity
LangSmith
Very High
Unreal Speech
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...
Unreal Speech
Unreal Speech offers a production-ready Text-to-Speech (TTS) API designed to cut costs significantly. It delivers ultra-low latency, streaming audio i...
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
Unreal Speech
Ultra-low Latency (300ms streaming)
Up to 11x Cheaper than Competitors
48 Natural-Sounding Voices
Multi-language Support (8 languages)
Per-Word Timestamps
High Volume Generation (up to 7B chars/month)
Key differentiators
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
Unreal Speech
- Ultra-low latency (300ms)
- Up to 11x cheaper than competitors
- High volume & scalability
Other comparisons
FAQ: LangSmith vs Unreal Speech
LangSmith: AI Agent & LLM Observability Platform. Unreal Speech: Cheapest Text-to-Speech API. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. LangSmith is freemium and Unreal Speech is freemium.
The best choice between LangSmith and Unreal Speech 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.
LangSmith offers: Cost tracking, Online LLM-as-judge and code evals, Tool and agent trajectory monitoring, Webhook and Pagerduty alerts. Unreal Speech offers: Ultra-low Latency (300ms streaming), Up to 11x Cheaper than Competitors, 48 Natural-Sounding Voices, Multi-language Support (8 languages).
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.