PromptLayer
by Magniv, Inc.
Prompt ops: manage, test, and trace AI prompts.
Score
Score
Our verdict
PromptLayer has matured into a full prompt-ops stack: a visual prompt registry with diffing and rollback, A/B testing, dataset-backed evaluations, and robust agent/workflow tracing that links production behavior to cost, latency, and tokens. The pricing is refreshingly simple and flat per plan—$49 Pro and $500 Team—while usage beyond included requests, agent nodes, and eval cells is metered at predictable per-transaction rates. Real strengths include decoupled prompt deploys, MCP and OpenTelemetry ingestion, and governance features on Enterprise (SSO, RBAC, approvals, HIPAA BAA, and hosting options). Two caveats stand out. First, seat caps are strict: Pro tops out at 5 users and Team at 25, so “unlimited seats” expectations will be disappointed. Second, some capabilities are gated: no webhooks below Team, and EU hosting or self-hosting require Enterprise. Dataset limits (10MB/150MB/1GB) also mean you’ll curate eval sets carefully. Overall, it’s a solid fit for teams that value observability and controlled prompt releases.
Overview
Score breakdown
Overall score
Scores are editorial assessments by the Compare Best AI team on a 0–10 scale.
Expert review
CBAI Editorial Team
Compare Best AI · Editorial Team
## Overview
How we tested
Days tested
7 days
Tasks evaluated
- ·Create and version prompts with rollback
- ·Run A/B tests across prompt variants
- ·Execute dataset evals with AI graders and review backtests
- ·Trace an agent workflow and analyze cost/latency/token metrics
Method
Compared against LangSmith (LangChain) and Humanloop using identical inputs
Reviewer
CBAI Editorial Team
Plans & pricing
FREE
- for hackers
- per month
- START FOR FREE
- 2.5k/month Requests
- 1 Workspace
- 250/month Eval Cell Executions
- 10MB max per Dataset
PRO
- for small teams
- per month
- Same limits as in Free, plus
- Unlimited Playgrounds
- Unlimited Workspaces
- 150MB max per Dataset
GET PRO
- Unlimited Workspaces
- 150MB max per Dataset
- for growing teams
- per month
- GET TEAM
- 25 Users
TEAM
- for growing teams
- per month
- GET TEAM
- 25 Users
- 100k+/month Requests
- 7.5k+/month Eval Cell Executions
- 1GB max per Dataset
Pricing may vary by region. Always verify on the vendor's website.
Feature comparison
| Feature | PromptLayer | LangSmith (LangChain) | Humanloop |
|---|---|---|---|
| Prompt Management | |||
| Visual prompt editor with versioning | |||
| Testing & Eval | |||
| Dataset-backed evals with AI/human graders | |||
| A/B testing of prompt versions | |||
| Observability | |||
| Agent/workflow tracing with cost/latency/tokens | |||
| Integrations | |||
| OpenTelemetry trace ingestion | |||
| MCP server support | |||
| Security & Hosting | |||
| Enterprise SSO and RBAC | |||
| Self-hosted / single-tenant option | |||
Is it right for you?
Good fit for
AI product teams
Ship prompt changes safely with versioning, A/B tests, and approvals.
ML/LLM engineers
Run dataset-backed evals and backtests; tie traces to cost and latency.
Platform/DevEx teams
Centralize prompt registry and observability; integrate via SDKs and OpenTelemetry.
Regulated enterprises
Enterprise SSO, RBAC, HIPAA BAA, and single-tenant/self-hosted options.
Less suited for
Solo users needing many seats
Pro is capped at 5 users; Team at 25. Unlimited seats require Enterprise.
EU hosting on lower tiers
Free, Pro, and Team are US cloud only; EU or self-hosting is Enterprise.
Unlimited evals without metering
Evals and agent runs are metered beyond included quotas on Pro/Team.
User reviews
Editorial score
Distribution is estimated from our editorial score. Verified user reviews coming soon.
Use cases
Typical ways teams rely on this tool — from everyday tasks to specialized workflows.
- Prompt version control
- A/B test prompt variants
- LLM evaluations and backtesting
- Agent tracing and observability
- Governed prompt deployments
Integrations
Reported connectors
Apps and services commonly connected out of the box or via official connectors.
- OpenTelemetry
- MCP servers
- Webhooks
Privacy & compliance
Security & data practices
Highlights we track from the vendor's documentation. Always confirm current terms, subprocessors, and regional policies on their official site.
- SOC 2 Type 2
- GDPR
- HIPAA (with BAA)
- CCPA
Details
Category
Price
- FREE $0
- PRO $49/mo
- GET PRO $0.003/mo
- TEAM $500/mo
Free version
Best for
- Collaborative prompt versioning and approvals
- A/B testing and evals on datasets
- Production tracing with cost/latency analytics
- Governance in regulated environments.
Frequently asked questions
PromptLayer
Developer
Ready to get started?
Visit the PromptLayer website to explore plans and start your free trial.
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