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PromptEval

PromptEval is a web and API platform for evaluating and improving prompts for large language models.

Place
#12 of 28
Score
6.6
PromptEval's website

What PromptEval is

PromptEval is a web and API platform for evaluating and improving prompts for large language models. It assigns a reproducible score from 0 to 100, with diagnostics on clarity, specificity, structure, and robustness, and returns issues, warnings, strengths, and improvement suggestions. Its optimizer can shorten prompts while preserving their intent and reports the percentage reduction. A versioned library keeps score history and differences between prompt versions. The A/B Playground compares two prompts across up to seven criteria using a user-provided API key. A GitHub Action can block a pull request when scores fall, contradictions appear, or prompts regress against production. Pro and Team users can serve prompts by slug through an API endpoint, with updates taking effect in about 60 seconds. The free plan includes three web evaluations monthly, 10 API lint calls, five library prompts, and an 8,000-character prompt limit. Basic costs $9 a month and Pro costs $19 a month. Managed API quotas range from 10 to 250 monthly calls, with a five-requests-per-minute limit.

Good

  • Scores prompts across four diagnostic dimensions.
  • Optimizer reports prompt-length reduction.
  • GitHub Action can flag prompt regressions.
  • Free plan includes three web evaluations monthly.

Watch out

  • Free plan limits prompts to 8,000 characters.
  • Managed API access has monthly quotas.
  • API rate limit is five requests per minute.
  • Team pricing is custom, with no amount listed.

Who it suits

PromptEval suits solo developers and teams evaluating prompts, including developers deploying prompts to production or overseeing them. Its version history, testing, and pull-request checks fit prompt development workflows.

Verdict

PromptEval brings scoring, revision history, comparison, and production checks into one prompt workflow. Review the plan quotas and prompt-size limits against your expected usage.

Plans and prices

From PromptEval's own pricing page, checked 30 Sep 2026.

All about pricing
PlanPriceWhat it gives you
FreeFree3 web evals/month · API lint 10/month · library up to 5 prompts · prompts up to 8,000 characters · forever
Basic$9 a month30 credits/month · API lint 30/month · prompts up to 12,000 characters · $9/month
Pro$19 a monthUnlimited web usage · API lint 75/month · prompts up to 35,000 characters · $19/month
TeamPriced on requestAPI lint 250/month · prompts up to 60,000 characters · priority support within 24h · Custom

The facts

Each one read from PromptEval's own pages, with the date it was checked.

What it does

A/B testing
The A/B Playground tests two prompts with a user-provided API key across up to seven criteria and displays radar-chart results.checked 30 Sep 2026
API limits
The Eval API has managed monthly quotas of 10, 30, 75, and 250 calls for Free, Basic, Pro, and Team, respectively, with a 5-requests-per-minute rate limit.checked 30 Sep 2026
BYOK
An Anthropic key supplied through X-Provider-Key runs inference on the user's key, consumes no managed quota, and unlocks full mode on every plan.checked 30 Sep 2026
CI integration
The official GitHub Action can fail a pull request when a score drops, a contradiction appears, or a prompt regresses against production.checked 30 Sep 2026
Optimization
The token optimizer compresses prompts while preserving intent and reports the percentage reduction.checked 30 Sep 2026
Privacy and security
PromptEval says prompts are discarded after evaluation, never used to train AI models, protected by Row Level Security, and transmitted over HTTPS.checked 30 Sep 2026
Production serving
Pro and Team users can serve a production prompt by slug through GET /api/v1/prompts/{slug} without redeploying, with changes taking effect in about 60 seconds.checked 30 Sep 2026
Product purpose
PromptEval evaluates and optimizes prompts for large language models as a SaaS platform.checked 30 Sep 2026
Prompt analysis
The evaluator returns critical issues, warnings, strengths, and surgical recommendations for prompt improvements.checked 30 Sep 2026
Scoring
It provides a reproducible 0–100 score with diagnostics across clarity, specificity, structure, and robustness.checked 30 Sep 2026
Support
The Team plan includes priority support with a stated 24-hour response target.checked 30 Sep 2026
Target users
The product is positioned for solo developers, developers using AI at work, developers shipping prompts to production, and teams governing production prompts.checked 30 Sep 2026
Versioning
The versioned library stores prompt versions with score history and diffs.checked 30 Sep 2026

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