Both help you ship better prompts, but they aim at different jobs. PromptLens wins on side-by-side model comparison, OpenRouter-unified access, and public shareable reports. PromptLayer wins on workspaces, RBAC, tracing, and HIPAA.
A side-by-side look at PromptLens and PromptLayer.
| Feature | PromptLens | PromptLayer |
|---|---|---|
| Side-by-side N-model comparison view | Partial | |
| One key unlocks every provider | ||
| Day-one support for new frontier models | Partial | |
| Public shareable report links (no login) | ||
| Deterministic built-in scorers | ||
| LLM-as-judge custom metric | ||
| Structured output (JSON schema) validation | Partial | |
| Baseline + latest diff comparison | ||
| Scheduled evaluations | ||
| Prompt version history | Linear | Full registry + branches |
| Request tracing + log UI | ||
| Agent-specific tooling | ||
| Visual editor for non-engineers | ||
| Team workspaces / seats | ||
| Role-based access control / approvals | ||
| SDKs, webhooks, Slack integration | ||
| Self-host / on-prem | Enterprise only | |
| HIPAA / BAA | Enterprise only | |
| Full product entry price | $99/mo | $500/mo (Team) |
| Realistic free tier | 3 projects, 50 evals/day | 5 seats, 2.5k req/mo |
Side-by-side N-model comparison view
One key unlocks every provider
Day-one support for new frontier models
Public shareable report links (no login)
Deterministic built-in scorers
LLM-as-judge custom metric
Structured output (JSON schema) validation
Baseline + latest diff comparison
Scheduled evaluations
Prompt version history
Request tracing + log UI
Agent-specific tooling
Visual editor for non-engineers
Team workspaces / seats
Role-based access control / approvals
SDKs, webhooks, Slack integration
Self-host / on-prem
HIPAA / BAA
Full product entry price
Realistic free tier
Both help with prompts, but the shape of the job is different.
PromptLens is a comparison tool for developers picking a model. The hero flow is: paste one prompt, pick N models, see outputs aligned row-by-row with scores, share a public link. OpenRouter under the hood means GPT-5.4, Claude Opus 4.7, and Gemini 3 Pro land on day one through a single key.
PromptLayer is an enterprise prompt management and observability platform. The hero flow is: register prompts in a versioned registry, run regression sets, trace production LLM calls, and govern prompt changes across a team with workspaces, RBAC, and approvals.
How do you reach frontier models, and what happens when a new one ships?
One key via OpenRouter. Every provider appears in the same model picker. New frontier releases land the day OpenRouter picks them up, no config change on your side.
Bring your own key per provider. New models show up when PromptLayer updates their SDK abstractions.
How does a stakeholder or client review an evaluation?
Every run generates a public slug URL. Optional password, optional expiry. Viewers don't need a login, you don't pay per seat. Drop the link in Slack, a PR, or a deck.
Results live behind the PromptLayer workspace. Viewers need an account on your workspace to see them, and seats scale the bill.
What happens as the team gets bigger or a compliance review lands on you?
Not there yet. Single-user model, no RBAC, no SSO, no HIPAA. You can share out to external reviewers via public links, but internal governance isn't the product yet.
First-class. Role-based access, deployment approvals, HIPAA with BAA, SSO, self-hosted / single-tenant on major clouds. This is where PromptLayer earns enterprise pricing.
What do you pay to unlock the headline product?
$99/month unlocks everything. Free tier is real (3 projects, 50 evals/day, 3 share links). No seat math.
Free ($0, 5 seats, 2.5k req/mo, 250 eval cells), Pro ($49/mo capped), Team ($500/mo, 25 seats, 100k req/mo, webhooks), Enterprise (custom, HIPAA, SSO, self-host).
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