Langfuse
Open Source LLM Engineering Platform
Spell
Streamline Machine Learning.
FactScore™ 0Updated February 2026
| Langfuse | Spell | |
|---|---|---|
| Rating | 5.0★ | N/A |
| Reviews | 41 | 0 |
| Pros | 18 | 0 |
| FactScore™ | 81.2 | 0 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in Langfuse — Pros
LLM observability Open source Detailed tracing Monitoring capabilities Cost-effective Easy to integrate Free tier SDK availability Seamless integration Debugging tools Fast iterations Insightful analytics Community engagement Detailed analytics Excellent UI Flexible architecture Open API Robust telemetryBoth tools — Pros
—Only in Spell — Pros
No unique pros listedOnly in Langfuse — Cons
—Both tools — Cons
—Only in Spell — Cons
—Details
| Langfuse | Spell | |
|---|---|---|
| Categories | AI Infrastructure Tools, AI Metrics and Evaluation | AI Infrastructure Tools, AI Metrics and Evaluation, Cloud Computing Platforms |
| Platforms | Web | Web |
| Became Popular | August 20, 2023 | January 20, 2019 |
| Website | langfuse.com | www.spell.run |
Who Should Pick Which?
Choose Langfuse if...
- LLM observability
- Open source
- Detailed tracing
Choose Spell if...
- No unique pros listed
With a FactScore™ of 81.2 vs 0, Langfuse leads in community reception. Langfuse uniquely offers LLM observability and Open source, while Spell stands out for No unique pros listed.
What Users Say
Langfuse
Without Langfuse, we would have been flying blind with our drafting agent. This platform is critical not just for measuring performance, but for understanding exactly what context gets pulled into ...
So excited to see Langfuse go live — we've been a happy user for 4 weeks now. Most detailed latency and analytics in the market. Highly recommend for anyone using complex chains or with user-f...
We’ve been unsung Langfuse for 2 months now. It’s easy to integrate and makes it simpler for us to monitor & debug LLM requests during development and beyond.
Spell
No reviews yet
Related Comparisons
Frequently Asked Questions
Which is better, Langfuse or Spell?
Based on FactScore™, Langfuse leads with a score of 81.2 vs 0. Langfuse has a higher rating of 5.0★ compared to N/A★.
What are the pros of Langfuse compared to Spell?
Langfuse uniquely offers: LLM observability, Open source, Detailed tracing, Monitoring capabilities, Cost-effective.
What are the pros of Spell compared to Langfuse?
Spell uniquely offers: No unique pros listed.
Is Langfuse better rated than Spell?
Langfuse is rated 5.0★ from 41 reviews. Spell is rated N/A★ from 0 reviews.
What is the FactScore™ of Langfuse and Spell?
FactScore™ weighs rating and review volume together. Langfuse scores 81.2 and Spell scores 0.
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