LangfuseOpen Source Agent Evals & Observability
vs
PrometheusOpen source monitoring system and time series database
Comparison · Observability · weekly run Nov 3
Langfuse vs Prometheus
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Prometheus is the stronger AI pick in Observability: it has a visibility score of 20.8 versus 1.4 for Langfuse.
Choose Langfuse if…
- AI answers describe it more positively (50% vs 13% positive)
- You need a self-hosted or on-premises option
- You need SOC 2 Type II or ISO 27001 or HIPAA-ready region or GDPR coverage
- Discounted cloud pricing for qualifying early-stage startups
Choose Prometheus if…
- You want the brand AI engines rank higher (20.8 vs 1.4)
- Open-source, standards-driven telemetry
- Mature, widely adopted Prometheus ecosystem
- Strong OpenTelemetry and Prometheus support
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Langfuse | Prometheus |
|---|---|---|
| Visibility score | 1.4% | 20.8% |
| Change vs last week | New | New |
| Rank in Observability | #27 | #7 |
| Share of voice | 0.4% | 6.1% |
| Mentions this run | 2 | 36 |
| Positive in AI answers | 50% | 13% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Langfuse 0pp · Prometheus 0pp over 0 weekly runs.
Engine by engine
Prometheus leads on 3 of 3 engines
ChatGPT
AI Mode
Perplexity
LangfusePrometheus
Head to head in AI answers
0 engine answers name both brands
0Langfuse ranked higher
0Prometheus ranked higher
Features, pricing & fit
| Dimension | Langfuse | Prometheus |
|---|---|---|
| Pricing model | Usage-based | — |
| Entry price | Free; paid from $29 / mo | — |
| Free plan | Yes | — |
| Deployment | Langfuse Cloud in US, EU, Japan and HIPAA regions, or self-hosted under the MIT license | Self-hosted; the server runs as a single binary with no external dependencies. |
| Integrations | 100+ | — |
| Compliance | SOC 2 Type II, ISO 27001, HIPAA-ready region, GDPR | — |
| Support | Community support via GitHub, In-app support, Private Slack or MS Teams channel on Pro and Enterprise plans, Named lead support engineer on Enterprise plans | Community support, Training |
| Founded | — | 2012 |
| Funding | Seed · $4M raised | — |
| Best for | Engineering teams building LLM applications and AI agents that want open-source, self-hostable tracing and evaluation | Teams monitoring cloud native and containerized applications, systems, and services |
Plans side by side
Prometheus
Pricing not available.
Pros and cons
Themes from the AI answers that mention each brand
Langfuse
- Discounted cloud pricing for qualifying early-stage startups
- Well suited to evaluating and debugging LLM or agent behavior
Prometheus
- Open-source, standards-driven telemetry
- Mature, widely adopted Prometheus ecosystem
- Strong OpenTelemetry and Prometheus support
- Low cost and flexible
- Avoids vendor lock-in
- Self-hosting requires setup, storage, upgrades and maintenance
- Needs significant engineering time to scale and maintain
- Infrastructure and maintenance costs still apply
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Langfuse vs Prometheus”, https://slateindex.ai/compare/langfuse-vs-prometheus-grafana, data of Nov 3, 2026. Licence: CC BY 4.0.