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Arize AI vs Datadog Logs

Arize AI logo

Arize AI

AI

AI engineering platform for observability and evaluation of agents and LLM apps

From
Free
Rated
-
Full reviewWebsite
Datadog Logs logo

Datadog Logs

Logging

Log Management and Analytics

From
$0.1/per GB ingested per month
Rated
-
Full reviewWebsite

The short version

  • Only Arize AI has a free tier, so it costs nothing to try first.
  • Each has a real cost: Arize AI the free plan caps trace spans at 25,000 per month with only 15 days of retention.; Datadog Logs complex, multi-tiered pricing model based on ingestion, indexing, and storage; can become expensive at scale
  • They diverge on capability: Arize AI covers End-to-end tracing, Datadog Logs covers Log ingestion.

Where they differ

Only the attributes on which Arize AI and Datadog Logs actually diverge.

Attributes where Arize AI and Datadog Logs differ
AttributeArize AIDatadog Logs
Starting priceFree$0.1/per GB ingested per month
Pricing modelfreemiumusage-based
Free tierYesNo
Platformsweb, apiCloud (AWS, Azure, Google Cloud, Oracle Cloud)
CategoryAILogging
FoundedUnknown2010

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Arize AI

  • End-to-end tracing
  • Evaluation framework
  • Prompt testing and improvement
  • Alyx AI engineering agent
  • Data warehouse integrations

Only in Datadog Logs

  • Log ingestion
  • Full-text search
  • Log-based metrics
  • API
  • Webhooks
  • REST
  • Web support
  • Api support

Both cover

  • Custom dashboards

What people use each for

The jobs each tool is most often brought in to do.

Arize AI

  • Tracing and debugging production AI agentsnot Datadog Logs
  • Running large-scale evaluations across traces and sessionsnot Datadog Logs
  • Improving prompts before production rolloutnot Datadog Logs
  • Storing and querying GenAI traces alongside a data warehousenot Datadog Logs

Datadog Logs

  • Centralised log aggregation and analysisnot Arize AI
  • Multi-source log correlation with metrics and tracesnot Arize AI
  • Root cause analysis and troubleshootingnot Arize AI
  • Security monitoring and threat detectionnot Arize AI

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Arize AI

  • The free plan caps trace spans at 25,000 per month with only 15 days of retention.
  • Self-hosted deployment and Data Fabric integration are restricted to the custom-priced Enterprise tier.
  • Pricing beyond the $50/month Pro plan requires a custom quote, making cost planning less transparent at scale.
  • Advanced compliance features like HIPAA are only available on Enterprise.

Datadog Logs

  • Complex, multi-tiered pricing model based on ingestion, indexing, and storage; can become expensive at scale
  • Ingestion pricing of $0.10/GB can accumulate rapidly for high-volume logging environments

Pricing, plan by plan

Arize AI

Free
  • AX FreeFree
    • 25k trace spans/month
    • 1 GB storage/month
    • 15-day retention
  • AX Pro$50/month
    • 50k trace spans/month
    • 10 GB storage/month
    • 30-day retention
  • AX Enterprise$undefined/mo
    • Custom trace spans, storage, and retention
    • SaaS or self-hosted deployment
    • Managed agents and Data Fabric

Datadog Logs

$0.1/per GB ingested per month

No published plan breakdown. See the Datadog Logs review.

Which should you pick?

Choose Arize AI if

  • You need end-to-end tracing.
  • You want to start without paying.
  • You work on web, api.
  • You also want evaluation framework.
Arize AI review

Choose Datadog Logs if

  • You need log ingestion.
  • You work on Cloud (AWS, Azure, Google Cloud, Oracle Cloud).
  • You also want full-text search.
Datadog Logs review

Questions people ask

Is Arize AI or Datadog Logs better?
Neither clearly leads. Arize AI starts at Free and Datadog Logs at $0.1/per GB ingested per month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Arize AI or Datadog Logs?
Arize AI has a free tier; the other does not. Paid plans start at Free for Arize AI and $0.1/per GB ingested per month for Datadog Logs.
Does Arize AI or Datadog Logs run on more platforms?
Arize AI runs on web, api. Datadog Logs runs on Cloud (AWS, Azure, Google Cloud, Oracle Cloud).
Can I use Arize AI for free?
Yes. Arize AI has a free tier, so you can try it without paying. Datadog Logs starts at $0.1/per GB ingested per month.
What is Arize AI best used for?
Arize AI is most often used for tracing and debugging production ai agents, running large-scale evaluations across traces and sessions, improving prompts before production rollout, storing and querying genai traces alongside a data warehouse. Of those, tracing and debugging production ai agents and running large-scale evaluations across traces and sessions are not what Datadog Logs is typically brought in for.
What can Arize AI do that Datadog Logs cannot?
Arize AI covers End-to-end tracing, Evaluation framework, Prompt testing and improvement, Alyx AI engineering agent. Datadog Logs covers Log ingestion, Full-text search, Log-based metrics, API. Both handle Custom dashboards.

Answered from the vendors’ own pages

Arize AI: What does Arize AX cost?

Arize AX offers a free plan, a Pro plan at $50/month, and a custom-priced Enterprise plan, with pricing based on trace spans, storage, and retention needs.

Source
Datadog Logs: What pricing options does Datadog offer for log ingestion and processing?

Log ingestion starts at $0.10/GB (annual billing; $0.10 on-demand). Standard indexing costs $1.70 per million events per month (annual; $2.55 on-demand). Flex Storage costs $0.05/million events stored per month (annual; $0.075 on-demand). Flex Logs Starter costs $0.60/million events stored per month (annual; $0.90 on-demand).

Source
Arize AI: Is there a free plan, and what are its limits?

The AX Free plan includes 25,000 trace spans and 1 GB of storage per month with 15-day retention, plus unlimited users, evaluations, and experiments.

Source
Datadog Logs: What retention options are available and how does it affect pricing?

Standard indexing offers 15-day retention with options for 3 to 30+ days. Flex Storage supports flexible retention up to 15 months. Flex Logs Starter includes bundled compute for retention of 3-15 months.

Source
Arize AI: What deployment options are available?

Free and Pro plans are SaaS-only, while Enterprise customers can choose SaaS or self-hosted deployment with custom SLAs.

Source
Datadog Logs: Is there a cost to forward logs to external systems?

Yes, log forwarding costs $0.25/GB outbound per destination for routing logs to external systems.

Source
Datadog Logs: What discounts are available for high-volume customers?

Multi-year and volume discounts are available for customers processing 3B+ events per month.

Source
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