Arize AX free tier includes Platform for agent observability, evaluation and improvement… Not verified — we refused the change we last considered recording, on 2026-11-08. Compare with 7 alternatives in AI / ML.

Arize AX Free Tier 2026

Subtypes in AI / ML: llm_observability — records the prompts, responses, latency, cost and tool calls an application sent to a model, for reading afterwards; llm_evaluation — scores model or agent output against a dataset, a rubric or a judge model on runs you trigger. We read that on 2026-09-01 from https://arize.com/pricing, where it says: “Trace, evaluate, and improve your agents” How we use this.

Limits, pricing history, and 7 alternatives. Verified October 2026. Last updated 2026-11-08.

Arize AX's free tier offers Platform for agent observability, evaluation and improvement… We are not rating this offer today; this page's Last read note says why.

One of 89 AI / ML services we track. See our full AI / ML Free Tier Comparison →

Tier

Free

Free Tier Details

Platform for agent observability, evaluation and improvement. AX Free costs $0 with no credit card required: 25k trace spans per month, 1 GB ingestion per month, 15 days of retention, unlimited users and evals, 10 Signal issues per month, the Alyx agent and community support. AX Pro is $50 per month with 50k spans and 10 GB of ingestion per month and 30 days of retention. Arize also offers Phoenix, which is ELv2 licensed and can be self-hosted, and 2 Phoenix Cloud instances for free.

From arize.com/pricing, read 2026-11-08:

AX Free For builders Free Start for free No credit card required Signal 10 issues per month Trace spans 25k spans per month Ingestion volume 1 GB per month Retention 15 days Deployment SaaS Users Unlimited Evals Unlimited

When You'll Outgrow Arize AX's Free Tier

When your usage exceeds the free tier limits, you'll need to upgrade.
At that point, the 7 alternatives in AI / ML are each listed with the free tier they offer, so you can compare what they give you against what you have outgrown.

Pricing Change History (0 recorded)

No recorded pricing changes for Arize AX. We publish no change we refused to record, so treat the empty history as a statement about our records, not about this vendor's pricing.

View all 513 pricing changes across all vendors →

Alternatives in AI / ML

How Arize AX compares against every one of the 7 we list, not against a selection of them. A surface with room for every member of a tied set may rotate their order. A surface with room for only some of them names none of them, because which ones it named would be the claim, and a claim seeded on the date is not the one we serve tomorrow. How we decide this.

Service	Free Tier	Stability
Arize AX	Free	unrated
Comet ML	Free Comet makes Opik, for LLM and agent observability and evaluation, and an MLOps platform for ML experiment tracking. Opik is open source and free to self-host.	stable
Langfuse	Free Open-source LLM engineering platform for tracing, evaluating and debugging AI applications. The Langfuse Cloud Hobby plan is free with no credit card: 50k units a month (each trace, observation and score counts as one unit), 30 days of data access, 2 users, community support via GitHub, and all…	stable
Braintrust	Free Evals, prompt playground, and data management for Gen AI. Starter plan (free): 1 GB processed data/month, 10k scores/month, 14 days data retention.	stable
Keywords AI	Free Rebranded to Respan; keywordsai.co redirects to respan.ai. Free plan: full platform, 100k logs, 1k scores, 5 datasets, 2 evaluators, 5 prompts.	source unconfirmed
LangSmith	Free LLM observability and evaluation platform by LangChain — Developer plan is $0/seat/month with up to 5k base traces/month, then pay-as-you-go. LCU is $1.50/unit and LSU is $1.00/unit.	unrated — change unconfirmed
LangWatch	Free A LLMOps platform helping AI teams measure, monitor, and optimize LLM applications for reliability, cost-efficiency, and performance. With a powerful DSPy component, we enable seamless collaboration between engineers and non-technical teams to fine-tune and productionize GenAI products.	unrated
Portkey	Free Control panel for Gen AI apps featuring an observability suite & an AI gateway. Send & log up to 10,000 requests for free every month.	unrated

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), Brave Search API (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), Weights & Biases (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), Google Colab (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), SerpApi (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), xAI (shares no subtype with this product), Anthropic API (shares no subtype with this product), GitHub Models (shares no subtype with this product), 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 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), ElevenLabs (we have not classified this record), Stability AI (we have not classified this record), Daytona (shares no subtype with this product), Blaxel (shares no subtype with this product), Novita Sandbox (shares no subtype with this product), Runloop (shares no subtype with this product), Mem0 (shares no subtype with this product), Zep (shares no subtype with this product), Letta (we have not classified this record), Supermemory (shares no subtype with this product), Cognee (shares no subtype with this product), Serper (shares no subtype with this product), Linkup (shares no subtype with this product), Parallel (shares no subtype with this product), Jina AI (shares no subtype with this product), You.com (shares no subtype with this product), Hetzner Inference API (shares no subtype with this product), Cloudflare AI Search (we have not classified this record), Valyu (shares no subtype with this product). Each is still listed in AI / ML, with the vendor's own words we read that from on its page. How we decide this.

See full comparison →

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 list above is every one of the 7 entries in that order, not a prefix of it. The algorithm is published, so anyone can reproduce this page's order without asking us.

date: 2026-11-14
query_key: alternatives:AI / ML:Arize AX
seed: 523721558e0d538d47175f0e1cb9ca7f5c6611ceb116a577e8468f21d0752ce0
tie_count: 5

Watch Arize AX for Pricing Changes

We do not push notifications. Every change we record is readable the moment it lands, and the JSON answer carries an ETag — send it back as If-None-Match and an unchanged answer costs one 304.

curl https://agentdeals.dev/api/changes?vendor=Arize%20AX
curl https://agentdeals.dev/pricing-changes/feed.xml?vendor=Arize%20AX

API docs →

Frequently Asked Questions

Is Arize AX free?

Our stored record says Arize AX offers a free tier: Free. Platform for agent observability, evaluation and improvement. AX Free costs $0 with no credit card required: 25k trace spans per month, 1 GB ingestion per month, 15 days of retention, unlimited users ... We last confirmed these terms against the page we cite on 2026-10-16.

What is Arize AX's free tier?

Our stored record calls Arize AX's free tier "Free". Platform for agent observability, evaluation and improvement. AX Free costs $0 with no credit card required: 25k trace spans per month, 1 GB ingestion per month, 15 days of retention, unlimited users and evals, 10 Signal issues per month, the Alyx agent and community support. AX Pro is $50 per month with 50k spans and 10 GB of ingestion per month and 30 days of retention. Arize also offers Phoenix, which is ELv2 licensed and can be self-hosted, and 2 Phoenix Cloud instances for free. We last confirmed these terms against the page we cite on 2026-10-16.

Is Arize AX's free tier reliable?

We are not rating Arize AX's free tier today; this page's Last read note says why.

Is Arize AX's free tier good for production?

Arize AX's free tier is usable for prototyping and development. We are not rating it today; this page's Last read note says why.

What changed in Arize AX's pricing?

We publish no change we refused to record, so we cannot tell you that nothing changed.

What are the best free alternatives to Arize AX?

We publish no ranking of these. Nothing we record measures popularity or generosity, so naming a best or a top few would be our preference rather than our data. We hold 7 free alternatives to Arize AX in AI / ML, each listed above with its tier. Of those, 5 carry no recorded demerit and are indistinguishable under every signal we hold, so they are listed in an order that rotates daily, 2 are demoted with the reason named. Our ranking rule is published at /criteria.

When will I outgrow Arize AX's free tier?

When your usage exceeds the free tier limits, you'll need to upgrade. When you outgrow the free tier, evaluate paid plans against alternatives — sometimes a competitor's free tier covers what you need.

What category is Arize AX in?

Arize AX is categorized under AI / ML on AgentDeals. We list 7 other AI / ML services alongside it, every one of them on this page with its free tier and the stability we publish for it.