LangSmithAI Agents
vs
Retell AIAI Voice Agents That Automate Phone Calls
Comparison · AI Agents · weekly run Nov 3
LangSmith vs Retell AI
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
LangSmith is the stronger AI pick in AI Agents: it has a visibility score of 3 versus 2 for Retell AI.
Choose LangSmith if…
- You want the brand AI engines rank higher (3 vs 2)
- You need ISO 27001 (Engine feature) coverage
- strong production observability
- tracing, debugging and response evaluation
Choose Retell AI if…
- You need a self-hosted or on-premises option
- You need ISO 27001 coverage
- Highly rated by developers and SMBs
- One of the highest customer star ratings
AI visibility side by side
Latest weekly run · Nov 3
| Metric | LangSmith | Retell AI |
|---|---|---|
| Visibility score | 3% | 2% |
| Change vs last week | New | New |
| Rank in AI Agents | #31 | #42 |
| Share of voice | 0.9% | 0.5% |
| Mentions this run | 6 | 3 |
| Positive in AI answers | 17% | — |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
LangSmith 0pp · Retell AI 0pp over 0 weekly runs.
Engine by engine
LangSmith leads on 1 of 3 engines
ChatGPT
AI Mode
Perplexity
LangSmithRetell AI
Head to head in AI answers
0 engine answers name both brands
0LangSmith ranked higher
0Retell AI ranked higher
Features, pricing & fit
| Dimension | LangSmith | Retell AI |
|---|---|---|
| Pricing model | — | Usage-based |
| Entry price | — | Contact sales |
| Free plan | — | Yes |
| Deployment | Cloud, Bring Your Own Cloud, and Self-hosted | Cloud platform, with enterprise on-premises deployment available |
| Compliance | SOC 2 Type II, HIPAA, GDPR, ISO 27001 (Engine feature) | HIPAA, SOC 2 Type II, GDPR, ISO 27001 |
| Support | — | Community and email support, 24/7 omnichannel support with dedicated portal (Enterprise), Dedicated implementation support (Enterprise), Named account manager (Enterprise) |
| Founded | — | 2023 |
| Headquarters | San Francisco, California | Redwood City, California |
| Employees | — | 51–200 |
| Funding | Series B | Seed · $5M raised |
| Best for | — | Businesses that run high call volumes in healthcare, insurance, financial services, logistics and similar fields, and teams that want to build and change voice agents themselves. |
Plans side by side
LangSmith
Pricing not available.
Retell AI
Pay as you go$0per minute, $0.07-$0.31 for voice agents
EnterpriseCustomcustom pricing
Pros and cons
Themes from the AI answers that mention each brand
LangSmith
- strong production observability
- tracing, debugging and response evaluation
Retell AI
- Highly rated by developers and SMBs
- One of the highest customer star ratings
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “LangSmith vs Retell AI”, https://slateindex.ai/compare/langsmith-vs-retell-ai, data of Nov 3, 2026. Licence: CC BY 4.0.