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Phospho
Open-source text analytics on LLM app messages, clustering and scoring conversations to surface what users actually do.
| Category | Observability & Tracing |
| OpenTelemetry-native | No (proprietary SDK/format) |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | freemium |
| Pricing notes | OSS core; hosted tier with free plan |
| Framework integrations | openai-sdk, langchain, mistral |
| Funding / ownership | Y Combinator alum |
Pricing/feature source: https://phospho.ai
Frequently asked questions
Is Phospho open source?
Yes. Licensed under Apache-2.0.
Can I self-host Phospho?
Yes — Phospho can run in your own infrastructure.
Is Phospho OpenTelemetry-native?
No — Phospho relies on a proprietary SDK/format rather than native OpenTelemetry.
How much does Phospho cost?
Freemium. OSS core; hosted tier with free plan