LangSmith vs Relay.app
LangSmith and Relay.app are both AI Platforms tools in our directory. This side-by-side comparison covers pricing, user ratings, supported platforms, key features and open-source status so you can decide which one fits your needs.
Side-by-side comparison
| Attribute | LangSmith | Relay.app |
|---|---|---|
| Vendor | LangChain | Relay.app |
| Rating | ★ 4.4 | ★ 4.6 |
| Pricing | Freemium | Freemium |
| Platforms | Web, API | Web |
| Key features | Full trace visibility for chains & agents, Dataset + evaluation workflows, Prompt playground with versioning | Human approvals, AI steps, Pretty flows |
| Headquarters | San Francisco, USA | San Francisco, USA |
| Founded | 2023 | 2023 |
| Open source | No | No |
Key differences
- Relay.app has a higher user rating (4.6★ vs 4.4★).
- Both LangSmith and Relay.app use a Freemium model.
- LangSmith runs on Web, API; Relay.app runs on Web.
Frequently asked questions
Is LangSmith or Relay.app better?
By user rating, Relay.app scores higher (4.6★ vs 4.4★). Both are capable AI Platforms tools, so review the feature comparison for your use case.
Which is cheaper, LangSmith or Relay.app?
Both LangSmith and Relay.app use a Freemium pricing model.
Are LangSmith and Relay.app open source?
No — neither LangSmith nor Relay.app is open source.