PromptLayer

What it is for

PromptLayer is a prompt CMS with evals and traces: edit a versioned template in the registry, score it on a dataset, then watch the same version in production logs. Use it when the job is ship prompts without a redeploy, not when you need a general chat seat.

What makes it unique: the cover is PromptLayer’s own homepage registry editor — Prompt Registry, support-reply Editing Version 12, Save Template, and a user block with {{customer_name}} / {{order_id}} chips — not a wordmark.

Key features

• Prompt Registry — visually edit, version, label, A/B, and roll back a prompt without waiting on an app deploy (promptlayer.com; docs Prompt Registry). Diffs and release labels are this CMS, not a second product.
• Observability — production traces tied to the prompt version, with cost, latency, and token stats (docs Observability). A log, not an editor.
• Evaluations — dataset-backed tests, human review, and automated graders before a version ships (homepage “Evaluation”; pricing Eval Cell Executions). A test harness, not a trace.
• Agents / workflows — multi-step graphs (prompt + endpoint + parse nodes) you version and evaluate as one run (homepage Agents; docs Workflows). A graph, not a single template.
• Playground — run a prompt live before you label it (pricing: Free 10/day; Pro unlimited). A scratch pad, not production.

SDKs, REST, webhooks, OpenTelemetry, and MCP are install / SDK. Request / eval-cell counts and $0.003 / $0.002 per txn overages are the meter. Model names are SKU.

Who it's for

Best fit: AI teams who will pay Pro or Team so more than 10 playground runs a day and 2.5k requests sit on a shared registry.

Pricing

Verified 2026-10-22 (Asia/Shanghai) from promptlayer.com/pricing. Cards printed per month.

• Free — $0/month. 5 users; 2.5k requests / month; 1 workspace; 250 eval cell executions / month; 10 playground runs / day; 10MB max dataset; 750 agent node executions / month. SaaS.
• Pro — $49/month. Same user/request floor as Free plus unlimited playgrounds and workspaces; 150MB datasets; pay-as-you-go $0.003/txn after the included pool.
• Team — $500/month. 25 users; 100k+ requests / month; 7.5k+ eval cells; 10k+ agent nodes; 1GB datasets; $0.002/txn overage.
• Enterprise — custom. RBAC, deployment approvals, HIPAA BAA, self-hosted / single-tenant.

FAQ: Free/Pro/Team are US cloud. Additional usage is billed per transaction (requests, agent runs, eval cells).

Limitations / costs

• Free is 2.5k requests and 10 playground runs a day. Pro is the first unlimited-playground card.
• $49 / $500 are monthly cards. Confirm annual checkout if the page adds one later.
• Prompt CMS, not a model gateway. For a proxy + spend cap, see Helicone.

Alternatives

• LangSmith — LangChain’s trace + eval desk.
• Langfuse — open-source LLM observability.
• Braintrust — eval-first when the job is scoring, not a prompt CMS.

Official tutorial

Official PromptLayer channel exists (oEmbed author: PromptLayer). We did not treat the “what is a prompt” explainer as a first-hour product walkthrough. Use written PromptLayer docs (observability → tables → registry) plus Pricing and that official channel.

Website

https://www.promptlayer.com

Source

Catalog row curated for AI Tools Nav. Cover is PromptLayer’s official homepage registry editor (support-reply v12 + template variables). Dollars checked on promptlayer.com/pricing (Free $0; Pro $49; Team $500 / mo). Channel: @promptlayer. No getting-started embed.

Last verified

2026-10-22 (Asia/Shanghai) editorial check.