sim Alternatives (2026)
The top alternatives to sim are ECC, langchain, ai, deepagents, llama_index, crewAI, semantic-kernel and dspy — ranked open-source Agent Framework agents on The Agentic Leaderboard.
Ranked by overall score on reliability, tool selection quality, autonomous iteration, efficiency, and community mindshare. Updated weekly.
| Rank | Alternative | Score | vs sim |
|---|---|---|---|
| #1 | ECC by affaan-m | 89.2 | +4.3 |
| #9 | langchain by langchain-ai | 86.2 | +1.3 |
| #10 | ai by vercel | 86.1 | +1.2 |
| #11 | deepagents by langchain-ai | 86.1 | +1.2 |
| #19 | llama_index by run-llama | 85.4 | +0.5 |
| #24 | crewAI by crewAIInc | 85.0 | +0.1 |
| #29 | semantic-kernel by microsoft | 84.9 | +0.0 |
| #31 | dspy by stanfordnlp | 84.8 | -0.1 |