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PromptLens
What PromptLens is
PromptLens is a web platform for managing prompts, evaluating changes, and observing production LLM workflows. Teams can compare a candidate prompt version with the production version on the same dataset, then inspect score changes, outputs, and failures. An LLM judge checks outputs against expected answers and returns pass or fail with a short explanation. Users can version prompts and publish the version an application needs through a retrieval API. Its observability product traces production model calls, tools, and retrieval, including timing, errors, usage, and cost. The homepage lists providers including OpenAI, Anthropic, Google, xAI, Meta, DeepSeek, Mistral, Cohere, and Amazon. Teams can connect a provider API key or run models through OpenRouter using purchased credits without adding a key. Shared report links are unlimited on every plan and open without an account or paid seat. Evaluations provide evidence and warnings for release decisions, but are not an automatic CI release gate. A free plan is listed; Pro costs $99 per organization / month. Access is subject to early-access approval.
Who it suits
PromptLens suits teams building production LLM workflows that need prompt versioning, evaluation, and visibility into model calls. It may also suit teams that want to share evaluation reports without requiring readers to have accounts or paid seats.
What it does well
- Compare candidate and production prompts on the same dataset.
- LLM judge returns pass or fail with explanations.
- Prompt versions can be published through a retrieval API.
- Shared report links are unlimited on every plan.
- Free plan includes email support.
What to know first
- Product access is subject to early-access approval.
- Evaluations do not automatically gate CI releases.
- Free plan limits organizations to two members.
- Pro costs $99 per organization / month.
Limits
The Free plan is capped at 2 members, 3 projects, 3 prompts, 10 test cases per dataset, 50 evaluation runs per member per 24 hours, and 50 playground calls per hour. Pro is $99 per organization per month and allows up to 10 projects, 10 prompts, 500 test cases per dataset, 100 evaluation runs per member per 24 hours, and 500 playground calls per hour.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | $0 per organization / month · 2 members · 3 projects · 3 prompts · up to 10 test cases per dataset · 50 evaluation runs per member per 24 hours · 50 playground calls per hour | Free |
| Pro | $99 per organization / month · Unlimited members · 10 projects · 10 prompts · up to 500 test cases per dataset · 100 evaluation runs per member per 24 hours · 500 playground calls per hour · $50 welcome model credits that never expire · priority email support | $99 a month |
| Teams | Custom volume pricing · Custom project, prompt, and dataset limits · higher evaluation and playground volume · provider policy controls · security review · dedicated support | On request |
As promptlens.io lists them, read 2 Oct 2026. The maker's own page has the final word.
Getting started
- Visit https://www.promptlens.io/.
- Request early-access approval for product access.
- Use the web service after access is approved.
- Choose the Free plan or Pro at $99 per organization per month.
- Connect a provider API key, or use purchased OpenRouter credits without adding a key.
Verdict
PromptLens brings prompt management, evaluations, and observability together for LLM workflows. Its evaluations can inform release decisions, but they do not automatically control releases, and product access requires early-access approval.
Questions
Is there a free plan?
Yes. Free costs $0 per organization per month and includes 2 members, 3 projects, 3 prompts, and the listed evaluation and playground limits.
How much does Pro cost?
Pro costs $99 per organization per month. It includes unlimited members, 10 projects, and 10 prompts.
What platforms does PromptLens support?
PromptLens is available on the web.
Which model providers can teams test?
The homepage lists OpenAI, Anthropic, Google, xAI, Meta, DeepSeek, Mistral, Cohere, and Amazon. Organizations can connect a provider API key or use purchased OpenRouter credits without adding a key.
Do evaluations automatically control releases?
No. Evaluations provide evidence and warnings for release decisions, but they are not an automatic CI release gate.
Who can open a shared report?
Anyone with the shared report link can open it without an account or paid seat. Shared report links are unlimited on every plan.
Facts from PromptLens's own pages
- Availability
- The evaluations page says product access is subject to early-access approval. · promptlens.io, 2 Oct 2026
- Cookies
- The privacy policy says PromptLens uses essential cookies for sessions and preferences and does not use tracking or advertising cookies. · promptlens.io, 2 Oct 2026
- Data retention
- Users can delete datasets, prompts, and experiments at any time; after account deletion, PromptLens says it will delete the user's data within 30 days. · promptlens.io, 2 Oct 2026
- Evaluation workflow
- Teams can compare a candidate prompt version with the production version on the same dataset, then review score changes, outputs, and failures. · promptlens.io, 2 Oct 2026
- Model access
- Organizations can connect a provider API key or use purchased credits to run models through OpenRouter without adding a key. · promptlens.io, 2 Oct 2026
- Model providers
- The homepage lists OpenAI, Anthropic, Google, xAI, Meta, DeepSeek, Mistral, Cohere, and Amazon among the model providers teams can test across. · promptlens.io, 2 Oct 2026
- Observability
- The site says its observability product traces production model calls, tools, and retrieval, including timing, errors, usage, and cost. · promptlens.io, 2 Oct 2026
- Prompt management
- PromptLens lets users version prompts and publish the version their application needs through a retrieval API. · promptlens.io, 2 Oct 2026
- Release control
- Evaluations provide evidence and warnings for release decisions, but they are not an automatic CI release gate. · promptlens.io, 2 Oct 2026
- Scoring
- An LLM judge compares each output to an expected answer and returns pass or fail with a short explanation. · promptlens.io, 2 Oct 2026
- Security
- The privacy policy says sensitive data is encrypted at rest, data is transmitted over HTTPS, and access to user data is restricted to authorized personnel. · promptlens.io, 2 Oct 2026
- Shared reports
- Anyone with a shared report link can open it without an account or paid seat, and shared report links are unlimited on every plan. · promptlens.io, 2 Oct 2026
- Support
- The Free plan includes email support, Pro includes priority email support, and Teams includes dedicated support. · promptlens.io, 2 Oct 2026
- What it does
- PromptLens provides prompt management, evaluations, and observability for teams shipping production LLM workflows. · promptlens.io, 2 Oct 2026
Where PromptLens stands on Freedom251
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