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PromptLayer

PromptLayer helps AI teams manage prompts, run evaluations, trace agents, and monitor LLM application usage.

PromptLayer

PromptLayer combines a prompt registry and visual CMS with evaluations, observability, and agent tracing. Teams can edit, version, test, deploy, and roll back prompts while connecting production traces to prompt versions.

Engineers, product teams, marketers, content teams, and subject-matter experts use it to evaluate prompt changes, compare models, inspect tool calls, and track cost, latency, and token usage. Usage above plan limits is charged per transaction, and enterprise customers can choose flexible hosting and compliance options.

Features

  • Edit and test prompts in a no-code visual editor
  • Version, diff, comment on, deploy, and roll back prompts
  • Run historical backtests and regression evaluations
  • Compare models and parameters on test datasets
  • Track cost, latency, token usage, and request logs
  • Trace multi-step agent workflows and inspect tool calls
  • Use REST APIs, SDKs, webhooks, and evaluation workflows

Use cases

  • Version prompts without waiting for application redeploys
  • Run regression tests before releasing prompt changes
  • Review AI-generated customer-support responses and edge cases
  • Let domain experts improve prompts without editing application code
  • Debug failed agent workflows using production traces
  • Compare prompt versions by quality, cost, and latency

Pros

    Cons

      Pricing

      Starting price
      $49 per month
      Pricing checked
      2026-09-19

      Free

      $0 per month

      • 5 Users
      • 2.5k/month Requests
      • 1 Workspace
      • 250/month Eval Cell Executions
      • 10MB max per Dataset

      Pro

      $49 per month

      • Same limits as in Free, plus
      • Unlimited Playgrounds
      • Unlimited Workspaces
      • 150MB max per Dataset
      • Pay-as-you-go ($0.003 per txn)

      Team

      $500 per month

      • 25 Users
      • 100k+/month Requests
      • 7.5k+/month Eval Cell Executions
      • 1GB max per Dataset
      • Pay-as-you-go ($0.002 per txn)

      Enterprise

      Custom

      • Custom limits on everything
      • Role Based Access Controls
      • Deployment Approvals
      • HIPAA with BAA
      • Flexible Hosting Options
      • Dedicated Support
      • Data Retention Control
      Official website