Best Letta Alternatives in 2026

#1 alternative

Ollama

Run open LLMs locally with a single command.

#2 alternative

Hugging Face

The open hub for machine learning models, datasets, and demos.

#3 alternative

Groq

Very fast LLM inference on custom LPU hardware.

#4 alternative

Together AI

Inference, fine-tuning, and GPU clusters for open models.

#5 alternative

Replicate

Run and deploy open-source AI models with one API call.

#6 alternative

Weaviate

Open-source AI-native vector database

#7 alternative

Qdrant

High-performance open-source vector search engine

#8 alternative

Chroma

Open-source embedding database for AI apps

#9 alternative

Milvus

Open-source vector database built for scale

#10 alternative

Langfuse

Open-source LLM observability and evaluation

#11 alternative

Dify

Open-source platform for building production-ready LLM apps and agents.

#12 alternative

Helicone

Open-source LLM observability and AI gateway in one line of code.