Ell
by William Guss · open-source · Last verified 2026-03-17
Lightweight prompt engineering library that treats prompts as functions with automatic versioning and tracing. Provides a simple decorator-based API for managing LLM calls with built-in studio UI.
https://docs.ell.so ↗C
C—Below Average
Adoption: CQuality: B+Freshness: ACitations: DEngagement: F
Specifications
- License
- MIT
- Pricing
- open-source
- Capabilities
- prompt-versioning, automatic-tracing, studio-ui, multi-model-support, prompt-functions
- Integrations
- openai, anthropic
- Use Cases
- prompt-management, prompt-iteration, llm-development, prompt-testing
- API Available
- Yes
- SDK Languages
- python
- Deployment
- self-hosted
- Rate Limits
- N/A (open-source)
- Data Privacy
- Self-hosted, user-managed
- Tags
- prompt-engineering, versioning, llm-calls, developer-tools
- Added
- 2026-03-17
- Completeness
- 100%
Index Score
41.3Adoption
42
Quality
75
Freshness
80
Citations
38
Engagement
0