PromptFix: AI Prompt Scoring and Testing | hokai.io
PromptFix scores AI prompts 0-100, runs A/B tests, and compares GPT-4, Claude, and Gemini. Free plan available. Pro plan at $29/month with unlimited analyses and REST API.
PromptFix is a web-based AI prompt reliability platform at promptfix.online that scores prompts 0-100, versions history, and compares outputs across GPT-4, Claude, and Gemini. It offers a free tier with 15 analyses per month, a Starter plan at $9/month, and a Pro plan at $29/month that includes unlimited analyses, A/B testing, team collaboration, and a REST API.
Pricing
Free plan: 15 analyses/month, 3 comparisons, templates, daily challenges. Starter: $9/month, 100 analyses, 15 comparisons, reverse prompting, preference profiles. Pro: $29/month, unlimited analyses, A/B testing, prompt chains, team collaboration, REST API. Enterprise: custom pricing with SSO, audit logs, dedicated support, SLAs.
Frequently Asked Questions
What is PromptFix and what does it do?
PromptFix is a web-based AI prompt reliability and engineering platform available at promptfix.online. It analyzes AI prompts and returns a 0-100 reliability score based on clarity, structure, and specificity. The platform allows users to compare prompt performance across GPT-4, Claude, and Gemini, version their prompt history, run A/B tests, and access the analysis engine programmatically via REST API.
How much does PromptFix cost?
PromptFix offers four pricing tiers. The Free plan costs $0 and includes 15 analyses per month and 3 multi-model comparisons. The Starter plan is $9 per month and provides 100 analyses, 15 comparisons, reverse prompting, and preference profiles. The Pro plan is $29 per month and includes unlimited analyses, A/B testing, prompt chains, team collaboration, and REST API access. Enterprise pricing is custom and adds SSO, audit logs, dedicated support, and SLAs.
What are the main features of PromptFix?
The core features include a 0-100 prompt reliability scoring engine, multi-model comparison across GPT-4, Claude, and Gemini, prompt versioning and history tracking, A/B testing for prompt variants (Pro tier), reverse prompt engineering (Starter and above), a library of 300+ prompt templates, team collaboration tools, and a REST API for programmatic access. Daily challenges provide a gamified learning element for teams onboarding to prompt engineering.
Is PromptFix free to use?
Yes, PromptFix has a free plan that requires no credit card. The free tier provides 15 prompt analyses per month, 3 multi-model comparisons, access to the template library, and daily challenges. The free plan does not include the REST API, A/B testing, reverse prompting, or team collaboration features, which require a paid plan starting at $9 per month.
What are the best alternatives to PromptFix?
The closest alternatives are PromptLayer, which is better suited for development teams needing deep request logging and LLM observability in production applications; Langfuse, which offers more comprehensive tracing and evaluation features for teams with complex agentic workflows; and PromptPerfect, which historically served as a consumer-facing prompt optimizer, though it is shutting down in September 2026. PromptFix is best positioned for teams who want a focused scoring and testing workflow without the complexity of a full observability stack.
Who is PromptFix best for?
PromptFix is best for developers and prompt engineers who ship AI-powered applications and need systematic quality checks on the prompts before and after deployment. It fits teams that work across multiple LLM providers (OpenAI, Anthropic, Google) and want a single platform to compare and version prompts across all three. It is less suited to non-technical users writing occasional prompts or data scientists who need statistical evaluation frameworks rather than qualitative scoring.
Does PromptFix have an API?
Yes, PromptFix provides a REST API available on the Pro plan at $29 per month. The API allows programmatic access to the PromptFix analysis engine so teams can integrate prompt scoring into CI/CD pipelines, internal tools, and automated workflows. API keys are managed through the Pro account dashboard. The Free and Starter plans do not include API access.