Langfuse vs Weights & Biases
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Weights & Biases is the stronger AI pick in MLOps Platforms: it has a visibility score of 29.7 versus 0.3 for Langfuse, and ranks ahead in 100% of the answers that name both.
Choose Langfuse if…
- You need a self-hosted or on-premises option
- You need ISO 27001 or HIPAA-ready region or GDPR coverage
- Discounted cloud pricing for qualifying early-stage startups
- Well suited to evaluating and debugging LLM or agent behavior
Choose Weights & Biases if…
- You want the brand AI engines rank higher (29.7 vs 0.3)
- AI answers describe it more positively (53% vs 50% positive)
- You need ISO/IEC 27001:2022 or ISO/IEC 27017:2015 or ISO/IEC 27018:2019 coverage
- Polished, developer-first experiment tracking
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Langfuse | Weights & Biases |
|---|---|---|
| Visibility score | 0.3% | 29.7% |
| Change vs last week | New | New |
| Rank in MLOps Platforms | #51 | #6 |
| Share of voice | 0.2% | 7% |
| Mentions this run | 1 | 47 |
| Positive in AI answers | 50% | 53% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Langfuse 0pp · Weights & Biases 0pp over 0 weekly runs.
Engine by engine
Weights & Biases leads on 3 of 3 engines
Head to head in AI answers
1 engine answers name both brands
| Prompt | Engine | Langfuse | Weights & Biases |
|---|---|---|---|
| Top MLOps platform options for B2B SaaS companies | AI Mode | #10 | #6 |
Features, pricing & fit
| Dimension | Langfuse | Weights & Biases |
|---|---|---|
| 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 | Data residency and isolated compute and storage are supported |
| Integrations | 100+ | — |
| Compliance | SOC 2 Type II, ISO 27001, HIPAA-ready region, GDPR | ISO/IEC 27001:2022, ISO/IEC 27017:2015, ISO/IEC 27018:2019, SOC 2 Type II |
| 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 | — |
| Funding | Seed · $4M raised | $50M round led by Daniel Gross and Nat Friedman |
| Best for | Engineering teams building LLM applications and AI agents that want open-source, self-hostable tracing and evaluation | — |
Plans side by side
Weights & Biases
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
Weights & Biases
- Polished, developer-first experiment tracking
- Strong LLM observability and evaluation
- Hyperparameter optimization and sweeps
- Good collaboration features for teams
- Highly rated by users, about 4.5/5 on G2
- Pricing is unclear and usage-based charges may apply
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Langfuse vs Weights & Biases”, https://slateindex.ai/compare/langfuse-vs-weights-biases, data of Nov 2, 2026. Licence: CC BY 4.0.