Best Union.ai Alternatives in 2026

#1 alternative

ClearML

Open-source MLOps platform for experiments, pipelines, and model management

#2 alternative

Unsloth

Open-source library for fast, memory-efficient LLM fine-tuning

#3 alternative

Axolotl

Open-source framework that makes LLM fine-tuning reproducible from a single YAML config

#4 alternative

Predibase

Platform for fine-tuning and serving open-source LLMs (now part of Rubrik)

#5 alternative

OpenPipe

Turn expensive prompts into cheap fine-tuned models (now part of CoreWeave)

Enterprise platform to build and tune LLMs on your own data

#7 alternative

Retool

Build internal tools and AI apps fast with drag-and-drop plus code

#8 alternative

LangGraph

Graph-based orchestration for stateful, controllable LLM agents.

#9 alternative

Labelbox

Data-labeling platform and on-demand labeling services for AI

#10 alternative

Roboflow

End-to-end platform to build and deploy computer vision models

#11 alternative

AutoGen

Microsoft's multi-agent conversation framework (now in maintenance mode).

#12 alternative

Encord

Data platform for annotating and curating multimodal data for AI