Last updated: 2026-05-16
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...
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PromptFix is an AI prompt reliability and engineering platform built for developers and technical teams who ship prompts to production. Available at promptfix.online, it solves a specific problem that most AI practitioners face: prompts that work once but produce inconsistent results at scale. The platform's core scoring engine evaluates every prompt on a 0-100 scale, breaking down clarity, structure, and specificity into actionable fixes rather than vague suggestions. The platform works by submitting prompts through a web-based interface or via REST API, where the analysis engine returns a scored breakdown with specific recommendations. What distinguishes PromptFix from generic prompt tools is its multi-model comparison layer: teams can test the same prompt against GPT-4, Claude, and Gemini simultaneously, seeing how output quality diverges across providers before committing to a deployment. The versioning system records every iteration, so teams can trace regressions back to exact prompt changes. PromptFix is most useful for developers integrating LLMs into applications, AI product managers overseeing prompt quality across multiple features, and prompt engineers responsible for maintaining output consistency in customer-facing products. The gamified daily challenges also make it useful for teams onboarding junior staff to prompt engineering practices through structured exercises rather than trial-and-error. Pricing starts at free (15 analyses per month, 3 comparisons) and scales to $9 per month for the Starter plan (100 analyses, reverse prompting), $29 per month for Pro (unlimited analyses, A/B testing, REST API, team collaboration), and custom Enterprise pricing with SSO, audit logs, and dedicated SLAs. The platform is web-based with no native desktop or mobile apps. The REST API at the Pro tier enables CI/CD integration, letting engineering teams run prompt validation checks as part of automated pipelines before changes reach production. Enterprise plans add SSO, audit logs, and custom integrations suited to larger organizations with compliance requirements.
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.
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.
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.
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.
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.
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.
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.
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.