Best Comet ML Alternatives with Free Tiers (2026)

9 free alternatives in AI / ML. Sorted by pricing stability.

Current Comet ML Situation

Risk Level: caution
Why: discovered 2026-08-28 — The free tier is now limited to 25k spans per month with 60-day data retention, and focuses on observability and agent testing. There is also a separate 'Free Cloud' plan with different limits (up to 10 team members, 25k spans, 60-day retention) and a 'Free' open-source option. A free pro plan for academics is mentioned as 'New!'.
Category: AI / ML

Recent Pricing Changes (1)

restructured discovered 2026-08-28 high impact
The free tier is now limited to 25k spans per month with 60-day data retention, and focuses on observability and agent testing. There is also a separate 'Free Cloud' plan with different limits (up to 10 team members, 25k spans, 60-day retention) and a 'Free' open-source option. A free pro plan for academics is mentioned as 'New!'.

All Free Alternatives (9)

9 of these carry no recorded demerit and are indistinguishable under every signal we hold; their order rotates daily. 0 are demoted with the reason named, and 0 are listed last because they are not generally available or are not a free offer. How we rank.

Left out of this list: Hugging Face (shares no subtype with this product), Groq (shares no subtype with this product), Google Gemini API (shares no subtype with this product), Mistral AI (shares no subtype with this product), OpenRouter (shares no subtype with this product), Cloudflare Workers AI (shares no subtype with this product), Cerebras (shares no subtype with this product), Cohere (shares no subtype with this product), OpenAI (shares no subtype with this product), Pinecone (shares no subtype with this product), Qdrant (shares no subtype with this product), Deepgram (shares no subtype with this product), Kaggle (shares no subtype with this product), Roboflow (shares no subtype with this product), Scale AI (shares no subtype with this product), AssemblyAI (shares no subtype with this product), Replicate (shares no subtype with this product), Baseten (shares no subtype with this product), Clarifai (we have not classified this record), Neptune.ai (we have not classified this record), Labelbox (shares no subtype with this product), Composio (shares no subtype with this product), DeepAR (none of this category's subtypes apply), Maxim AI (shares no subtype with this product), OCR.Space (shares no subtype with this product), Parseur (shares no subtype with this product), Reducto (shares no subtype with this product), Tavily AI (shares no subtype with this product), paperspace (shares no subtype with this product), Audio Enhancer (none of this category's subtypes apply), Clair (none of this category's subtypes apply), Langtrace (we have not classified this record), Lumenfall.ai (shares no subtype with this product), Mediaworkbench.ai (none of this category's subtypes apply), Othor AI (none of this category's subtypes apply), Pollinations.AI (shares no subtype with this product), ReportGPT (none of this category's subtypes apply), Zenable (none of this category's subtypes apply), Vast.ai (shares no subtype with this product), xAI (shares no subtype with this product), Anthropic API (shares no subtype with this product), GitHub Models (we have not classified this record), NVIDIA NIM (shares no subtype with this product), Ollama Cloud (shares no subtype with this product), LLM7.io (shares no subtype with this product), SiliconFlow (shares no subtype with this product), Zhipu AI (shares no subtype with this product), DeepSeek API (shares no subtype with this product), MiniMax (shares no subtype with this product), Exa (shares no subtype with this product), GPU-Bridge (we have not classified this record), Google Vertex AI Agent Engine (we have not classified this record), Google Vector Search 2.0 (shares no subtype with this product), Google GLM 5 (shares no subtype with this product), Google Gemini Embedding 2 (shares no subtype with this product), Alibaba Cloud Qwen Code (none of this category's subtypes apply), E2B (shares no subtype with this product), Together AI (shares no subtype with this product), Fireworks AI (shares no subtype with this product), Modal (shares no subtype with this product). Each is still listed in its category, with the vendor's own words we read that from on its page. How we decide this.

LangSmith caution discovered 2026-09-01 model change
Free
AI / ML Verified 2026-08-08
Arize AI stable
Free
AI / ML Verified 2026-08-26
Portkey stable
Free
AI / ML Verified 2026-08-12
Arize AX stable
Free
AI / ML Verified 2026-09-02
Langfuse stable
Free
AI / ML Verified 2026-09-01
Weights & Biases caution discovered 2026-09-03 restricted
Free
AI / ML Verified 2026-08-17
Keywords AI stable
Free
AI / ML Verified 2026-09-02
Braintrust stable
Free
AI / ML Verified 2026-08-20
LangWatch stable
Free
AI / ML Verified 2026-08-10
Recompute today's order yourself. The order above is a permutation seeded only on the UTC date and the query key — no vendor name, slug, id or offer field is an input. The algorithm is published, so anyone can reproduce this page's order without asking us.
date
2026-09-06
query_key
alternative-to:Comet ML
seed
6700b43a608752c4a94dd129844503fef049bb0e8817d473d5eded15ffef551d
tie_count
9

Category Trends

See the broader pricing landscape for this category.

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Frequently Asked Questions

What are the best free alternatives to Comet ML?
The best free alternatives to Comet ML include Arize AI (Free), Portkey (Free), Arize AX (Free), Langfuse (Free), Keywords AI (Free).
Is Comet ML's free tier still available?
Comet ML has a free tier (Free), but it's flagged as "caution" because of one specific recorded change, discovered 2026-08-28: The free tier is now limited to 25k spans per month with 60-day data retention, and focuses on observability and agent testing. There is also a separate 'Free Cloud' plan with different limits (up to 10 team members, 25k spans, 60-day retention) and a 'Free' open-source option. A free pro plan for academics is mentioned as 'New!'.
How many free alternatives to Comet ML exist?
There are 9 free alternatives to Comet ML tracked on AgentDeals across the AI / ML category.
Has Comet ML changed their pricing?
Comet ML has 1 recorded pricing change. The most recent was discovered 2026-08-28: The free tier is now limited to 25k spans per month with 60-day data retention, and focuses on observability and agent testing. There is also a separate 'Free Cloud' plan with different limits (up to 10 team members, 25k spans, 60-day retention) and a 'Free' open-source option. A free pro plan for academics is mentioned as 'New!'.

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