kitio.aiMLflow vs Union.ai
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. MLflow is completely free, while Union.ai is free trial.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Experiment tracking
- Model registry
- GenAI tracing
- LLM evaluation
- Framework autologging
- Durable, resumable workflows
- Runs in your own cloud
- Distributed training
- Inference gateway
- Multi-cluster scheduling
- Lineage and artifacts
| Feature | MLflow | Union.ai |
|---|---|---|
| Best for | Open-source platform for ML experiments, models and GenAI tracing | Durable AI workflow runtime that runs inside your own cloud |
| Category | Models & APIs | Models & APIs |
| Pricing model | Free | Free trial |
| Starting price | Free | $950/mo |
| Free plan | Yes, fully free | No, trial available |
| Made by | Databricks | Union.ai |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
MLflow is completely free, while Union.ai is free trial.
Free plan
Cheapest paid plan
Top plan
Free trial
2 plans
Team
$950/mo
- Minimum, credited back as usage
- 2 active clusters
- 30-day data retention
- Standard 12x5 support
Enterprise
Custom
- Annual commit credited to usage
- Volume discounts on every meter
- Multi-region and multi-cloud
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
MLflow
- Free and widely adopted
- Covers classic ML and GenAI
- Managed options on many clouds
- Self-hosting needs setup
- UI less polished than SaaS tools
- GenAI features still maturing
Union.ai
- Data never leaves your infrastructure
- Failed steps resume where they stopped
- Plain Python on top of open-source Flyte
- $950 monthly minimum after the first month
- Meant for platform teams, not beginners
- Usage pricing takes effort to estimate
Which one should you choose?
Choose MLflow if you want:
- Free and widely adopted
- Covers classic ML and GenAI
- Managed options on many clouds
Watch out: self-hosting needs setup.
Choose Union.ai if you want:
- Data never leaves your infrastructure
- Failed steps resume where they stopped
- Plain Python on top of open-source Flyte
Watch out: $950 monthly minimum after the first month.
MLflow vs Union.ai FAQ
What is the difference between MLflow and Union.ai?
MLflow: Open-source platform for ML experiments, models and GenAI tracing. Union.ai: Durable AI workflow runtime that runs inside your own cloud. Both are models & apis tools.
Is MLflow or Union.ai cheaper?
MLflow is completely free, while Union.ai is free trial.
Do MLflow and Union.ai have free plans?
MLflow: Yes, fully free. Union.ai: No, trial available.
Who makes MLflow?
MLflow is made by Databricks, based in United States.
Who makes Union.ai?
Union.ai is made by Union.ai, based in United States.
Which should I choose, MLflow or Union.ai?
Choose MLflow if you value free and widely adopted and covers classic ml and genai. Choose Union.ai if you value data never leaves your infrastructure and failed steps resume where they stopped.