Category
MLOps & Fine-Tuning
Tune and ship custom models.
5 tools·2 with free plan·3 with free trial
Top picks
01
The AI developer platform for experiment tracking and LLMOps.
Weights & Biases is a mature, widely adopted platform that now covers both classic ML experiment tracking (Models) and LLM observability and evaluation (Weave). The free tier is genuinely useful for individuals and research, and Weave's one-decorator tracing is low-friction. Watch the non-commercial restriction on the free tier, the new 2026 usage-metered billing that makes costs harder to predict, and CoreWeave ownership, which raises questions about infrastructure neutrality and lock-in.
freemium·~$50/user/mo
02
Platform for fine-tuning and serving open-source LLMs (now part of Rubrik)
Important status note: Predibase was acquired by Rubrik, announced in June 2025 (reported at roughly $100M-$500M), and is being integrated into Rubrik's agentic AI and data-security stack. That makes it a strong technical platform for fine-tuning and serving open-source LLMs, but no longer an independent company. Anyone evaluating Predibase should verify current product availability, packaging, and pricing directly with Rubrik, since offerings may be transitioning post-acquisition.
paid·Contact sales (verify current status with Rubrik)
03
Turn expensive prompts into cheap fine-tuned models (now part of CoreWeave)
Status note: OpenPipe was acquired by CoreWeave in 2025 and its platform has been migrating into CoreWeave and Weights & Biases. The core idea (distill expensive prompts into cheaper fine-tuned models, plus RL for agents) is strong and well regarded, but OpenPipe is no longer an independent vendor. If you are evaluating it today, treat it as part of the CoreWeave/W&B ecosystem and confirm current product availability, migration path, and pricing directly with them.
paid·Usage-based; verify current status with CoreWeave/W&B
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Frequently asked questions
- What's the best mlops & fine-tuning tool?
- Weights & Biases currently leads in community votes. Weights & Biases is a mature, widely adopted platform that now covers both classic ML experiment tracking (Models) and LLM observability and evaluation (Weave). The free tier is genuinely useful for individuals and research, and Weave's one-decorator tracing is low-friction. Watch the non-commercial restriction on the free tier, the new 2026 usage-metered billing that makes costs harder to predict, and CoreWeave ownership, which raises questions about infrastructure neutrality and lock-in.
- Are there free options?
- 2 tools in this category offer a free plan. Another 3 have a free trial.
- How do you rank these tools?
- Tools are ranked by a combination of community upvotes, editorial review, and feature breadth. Our editors review pricing and capabilities quarterly.
- Can I suggest a tool we're missing?
- Yes — submit it here. Our team reviews submissions weekly.