Skip to content
SPECIFICTION
Get listed

PromptEval

prompt-eval.com

From $9/mo Free plan WebAPI
Visit prompt-eval.com
Spec score 8.0 #11 of 28 in AI Prompt Generators

What it is

PromptEval is a web and API SaaS platform for evaluating and optimizing large-language-model prompts. It assigns a reproducible score from 0 to 100, with diagnostics covering clarity, specificity, structure and robustness, then identifies issues, warnings, strengths and targeted fixes. A token optimizer compresses prompts while preserving intent and reports the reduction percentage. Its versioned library keeps prompt history, score changes and diffs. The A/B Playground compares two prompts across as many as seven criteria using a user-provided API key. An official GitHub Action can fail pull requests after score drops, contradictions or production regressions. Pro and Team users can serve prompts by slug through an API endpoint, with changes taking effect in about 60 seconds. Plans include a free tier, Basic at $9 a month, Pro at $19 a month, and custom-priced Team.

Spec sheet

Support
The Team plan includes priority support with a stated 24-hour response target.Read 30 Sep 2026 · prompt-eval.com
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.Read 30 Sep 2026 · prompt-eval.com
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.Read 30 Sep 2026 · prompt-eval.com
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.Read 30 Sep 2026 · prompt-eval.com
CI integration
The official GitHub Action can fail a pull request when a score drops, a contradiction appears, or a prompt regresses against production.Read 30 Sep 2026 · prompt-eval.com
Optimization
The token optimizer compresses prompts while preserving intent and reports the percentage reduction.Read 30 Sep 2026 · prompt-eval.com
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.Read 30 Sep 2026 · prompt-eval.com
Product purpose
PromptEval evaluates and optimizes prompts for large language models as a SaaS platform.Read 30 Sep 2026 · prompt-eval.com
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.Read 30 Sep 2026 · prompt-eval.com
Prompt analysis
The evaluator returns critical issues, warnings, strengths, and surgical recommendations for prompt improvements.Read 30 Sep 2026 · prompt-eval.com
Scoring
It provides a reproducible 0–100 score with diagnostics across clarity, specificity, structure, and robustness.Read 30 Sep 2026 · prompt-eval.com
Target users
The product is positioned for solo developers, developers using AI at work, developers shipping prompts to production, and teams governing production prompts.Read 30 Sep 2026 · prompt-eval.com
Versioning
The versioned library stores prompt versions with score history and diffs.Read 30 Sep 2026 · prompt-eval.com

Plans and prices

Free Free forever 3 web evals/month · API lint 10/month · library up to 5 prompts · prompts up to 8,000 characters Read 30 Sep 2026 · prompt-eval.com
Basic $9 a month $9/month 30 credits/month · API lint 30/month · prompts up to 12,000 characters Read 30 Sep 2026 · prompt-eval.com
Pro $19 a month $19/month Unlimited web usage · API lint 75/month · prompts up to 35,000 characters Read 30 Sep 2026 · prompt-eval.com
Team Priced on request Custom API lint 250/month · prompts up to 60,000 characters · priority support within 24h Read 30 Sep 2026 · prompt-eval.com

Every PromptEval plan and price →

Strong points and limits

Strong points

  • Reproducible 0–100 prompt scores
  • Diagnostics and targeted improvement recommendations
  • Version history with score diffs
  • GitHub Action for regression checks
  • Prompts discarded after evaluation

Limits

  • Free tier allows three web evaluations monthly
  • API has a five-requests-per-minute limit
  • Free library holds five prompts
  • No free trial

Who it suits

It suits solo developers, developers using AI at work, production prompt authors and teams governing prompt changes. Web, API access, testing and collaboration are listed.

Verdict

PromptEval covers prompt review, optimization, versioning, testing and deployment controls in one web/API service. The free plan is constrained, while paid tiers add larger limits and production-oriented capabilities.

Where Specifiction places it

Alternatives to PromptEvalAll alternatives →