Langfuse vs Relay.app
Langfuse 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 | Langfuse | Relay.app |
|---|---|---|
| Vendor | Langfuse | Relay.app |
| Rating | ★ 4.6 | ★ 4.6 |
| Pricing | Freemium | Freemium |
| Platforms | Web, API, Self-host | Web |
| Key features | Open-source traces for LLM apps, Prompt versioning & playground, Datasets and evals | Human approvals, AI steps, Pretty flows |
| Headquarters | Berlin, Germany | San Francisco, USA |
| Founded | 2022 | 2023 |
| Open source | Yes | No |
Key differences
- Langfuse and Relay.app share the same user rating (4.6★).
- Both Langfuse and Relay.app use a Freemium model.
- Langfuse is open source (its code is public), while Relay.app is proprietary.
- Langfuse runs on Web, API, Self-host; Relay.app runs on Web.
Frequently asked questions
Is Langfuse or Relay.app better?
Langfuse and Relay.app are rated equally (4.6★) by users, so the better choice depends on your needs — see the feature and platform comparison above.
Which is cheaper, Langfuse or Relay.app?
Both Langfuse and Relay.app use a Freemium pricing model.
Are Langfuse and Relay.app open source?
Langfuse is open source, while Relay.app is proprietary.