tools
PromptLayer
PromptLayer helps AI teams manage prompts, run evaluations, trace agents, and monitor LLM application usage.
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
Latest updates
- Import Rows from Smart Tables
Create input sets from rows in a Smart Table using the new Table rows option in the Open Library menu.
- Monthly Spend Cap for PromptLayer Provider Keys
Dashboard runs can now use PromptLayer-provided provider keys on active paid plans, with usage limited by a monthly spend cap.
- Vibe Chat Daily Limits
Vibe Chat is available on paid plans, with a daily message limit per user. Trial workspaces get a smaller daily allowance.
- Scorecard Evaluator Metrics
Column evaluators in Scorecard now support additional statistical metrics and a classification view for comparing outputs against expected values.
- Duplicate Smart Tables
You can now duplicate an existing Smart Table to reuse its structure as a starting point.
Capabilities
- Agent that edits files — “Build, trace, and improve agent workflows with prompts, tool calls, evaluations, and logs in one place.” source
- Choice of models — “Compare models” source
- Self-hosted — “Enterprise Self-hosted, managed single-tenant” source
- API — “PromptLayer provides versioned prompts, programmatic APIs, webhooks, and evaluation workflows for controlled CI/CD releases.” source
- Official SDKs — “Treat prompt versions like deployable software artifacts: retrieve them through an SDK or REST API, run regression evaluations when they change, and promote release labels only after checks pass.” source
- Builds agents and workflows — “Build, trace, and improve agent workflows with prompts, tool calls, evaluations, and logs in one place.” source
- Traces and evaluates — “PromptLayer is an AI engineering platform that combines a prompt registry and visual prompt CMS with LLM evaluations, observability, and agent tracing.” source
Get it
Pricing
- Starting price
- $49/mo
- Prices checked
- 2026-10-27
Free
Free
- 5 Users
- 2.5k/month Requests
- 1 Workspace
- 250/month Eval Cell Executions
- 10MB max per Dataset
Pro
- $49 per month
- 5 Users
- 2.5k+/month Requests
- Unlimited Playgrounds
- Unlimited Workspaces
- 150MB max per Dataset
- 250+/month Eval Cell Executions
Team
- $500 per month
- 25 Users
- 100k+/month Requests
- 7.5k+/month Eval Cell Executions
- 1GB max per Dataset
- Unlimited Workspaces
- Webhooks Included
Enterprise
Price on request
- Custom limits on everything
- Role Based Access Controls
- Deployment Approvals
- HIPAA with BAA
- Flexible Hosting Options
- Dedicated Support