AI Tools · head to head
PromptLayer vs Arize AI
PromptLayer
AI Tools
Collaboration platform for prompt management, evaluation, and observability
- From
- Free
- Rated
- -
Arize AI
AI Tools
AI engineering platform for observability and evaluation of agents and LLM apps
- From
- Free
- Rated
- -
The short version
- Each has a real cost: PromptLayer the free plan is capped at only 2,500 requests per month, quite limited for active production use.; Arize AI the free plan caps trace spans at 25,000 per month with only 15 days of retention.
- They diverge on capability: PromptLayer covers Visual prompt management, Arize AI covers End-to-end tracing.
Where they differ
Only the attributes on which PromptLayer and Arize AI actually diverge.
| Attribute | PromptLayer | Arize AI |
|---|
Identical on both: starting price (Free), pricing model (freemium), free tier (Yes), platforms (web, api), user rating (Not yet rated), category (AI Tools).
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 PromptLayer
- Visual prompt management
- Agent observability
- Evaluations
- Version control
- Cost and latency monitoring
- Agent workflow tracing
Only in Arize AI
- End-to-end tracing
- Evaluation framework
- Prompt testing and improvement
- Alyx AI engineering agent
- Custom dashboards
- Data warehouse integrations
What people use each for
The jobs each tool is most often brought in to do.
PromptLayer
- Versioning and deploying prompts without code redeploysnot Arize AI
- Running evaluations with human review before production releasenot Arize AI
- Tracing multi-step agent workflows for debuggingnot Arize AI
- Monitoring LLM cost and latency by featurenot Arize AI
Arize AI
- Tracing and debugging production AI agentsnot PromptLayer
- Running large-scale evaluations across traces and sessionsnot PromptLayer
- Improving prompts before production rolloutnot PromptLayer
- Storing and querying GenAI traces alongside a data warehousenot PromptLayer
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
PromptLayer
- The free plan is capped at only 2,500 requests per month, quite limited for active production use.
- The Team plan jumps to $500/month, a large step up from the $49/month Pro plan.
- Overage transaction fees apply on top of subscription costs, which can make total spend less predictable.
- Enterprise-grade features like HIPAA BAAs and custom deployment require contacting sales.
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.
Pricing, plan by plan
PromptLayer
Free- FreeFree
- 5 users
- 2,500 requests/month
- 1 workspace
- Pro$49/month
- Unlimited playgrounds and workspaces
- 150MB datasets
- Pay-as-you-go overage at $0.003/transaction
- Team$500/month
- 25 users
- 100k+ monthly requests
- Webhooks
- Enterprise$undefined/mo
- Custom limits
- Role-based access controls
- HIPAA with BAA
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
Which should you pick?
Choose PromptLayer if
- You need visual prompt management.
- You want to start without paying.
- You work on web, api.
- You also want agent observability.
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.
Questions people ask
- Is PromptLayer or Arize AI better?
- Neither clearly leads. PromptLayer starts at Free and Arize AI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, PromptLayer or Arize AI?
- PromptLayer starts at Free and Arize AI at Free.
- Does PromptLayer or Arize AI run on more platforms?
- Both run on web, api, so platform support will not decide this one for you.
- Can I use PromptLayer for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is PromptLayer best used for?
- PromptLayer is most often used for versioning and deploying prompts without code redeploys, running evaluations with human review before production release, tracing multi-step agent workflows for debugging, monitoring llm cost and latency by feature. Of those, versioning and deploying prompts without code redeploys and running evaluations with human review before production release are not what Arize AI is typically brought in for.
- What can PromptLayer do that Arize AI cannot?
- PromptLayer covers Visual prompt management, Agent observability, Evaluations, Version control. Arize AI covers End-to-end tracing, Evaluation framework, Prompt testing and improvement, Alyx AI engineering agent.
Answered from the vendors’ own pages
PromptLayer: What does PromptLayer cost?
PromptLayer has a free plan, a Pro plan at $49/month, a Team plan at $500/month, and custom Enterprise pricing, with additional usage billed per transaction beyond plan limits.
SourceArize 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.
SourcePromptLayer: Is there a free plan, and what are its limits?
The Free plan includes 5 users, 2,500 requests per month, 1 workspace, 250 monthly eval cell executions, and datasets up to 10MB.
SourceArize 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.
SourcePromptLayer: How is usage metered beyond the plan limits?
Additional usage is charged per transaction for requests, agent runs, and evaluation cell runs, at $0.003/transaction on Pro and $0.002/transaction on Team.
SourceArize 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.
SourceRelated pages
More on PromptLayer
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