PromptFix
PromptFix is an AI output reliability platform designed to help users create prompts that deliver consistent, accurate, and on-brand results from ChatGPT, Claude, and Gemini. It provides a prompt score from 0 to 100 based on output reliability, hallucination risk, and constraint coverage, along with actionable fixes that clarify ambiguous instructions, add output format constraints, and specify target audiences. The platform aims to reduce trial-and-error by diagnosing prompt weaknesses in under 60 seconds. Beyond scoring, PromptFix includes tools for prompt improvement and testing. Users can create optimized variants, run A/B tests to compare reliability, build reusable preference profiles for tone and brand rules, and track prompt versions over time. Team collaboration features support sharing prompts and profiles, while a REST API enables programmatic integration. A Chrome extension brings prompt optimization directly into ChatGPT, Claude, Gemini, and Perplexity, and 300+ templates cover common use cases. PromptFix offers a free plan with 15 analyses per month, 25 templates, and one preference profile. Paid Starter and Pro tiers add more analyses, full template access, A/B testing, team collaboration, API access, reverse prompt from images, and multi-model comparison. Additional resources include a prompt engineering academy, a games hub, and a certified professional credential. The platform works as a responsive mobile web app and serves individuals, creators, and teams.
- Category
- Prompts
- Pricing
- Free
Problem solved
PromptFix solves the problem of unreliable AI outputs by giving users a quantitative reliability score for their prompts and specific suggestions to fix ambiguity, missing constraints, and other weaknesses. It helps users stop guessing and instead optimize prompts systematically across ChatGPT, Claude, Gemini, and other models, leading to more consistent, accurate, and on-brand results.
Use cases
- Optimizing prompts for ChatGPT outputs
- A/B testing prompt variants to find the most reliable version
- Creating reusable preference profiles for tone, brand rules, and always-include settings
- Comparing GPT, Claude, and other model outputs side-by-side
- Versioning prompts and tracking reliability scores over time
- Improving prompts directly in ChatGPT, Claude, Gemini, or Perplexity via the Chrome extension
- Generating prompts from images using Reverse Prompt
- Earning a PromptFix Certified Professional credential
Audience
- Developers
- Business Users
- Content Creators
- Product Managers
- Startups
Pros
- Free plan forever with no credit card required
- Prompt scoring and actionable fixes in under 60 seconds
- Includes A/B testing, versioning, and team collaboration
- REST API and Chrome extension for programmatic and in-context use
- 300+ templates and a prompt engineering academy
Cons
- Free tier limited to 15 analyses per month
- Advanced features like API and reverse prompt require Pro plan
- Proprietary cloud platform; no self-hosting option
- Reliability score is model-dependent and may vary across providers
- Some features are new and may still be evolving
Official website: https://www.promptfix.online/
Canonical LambdaBase page: https://www.lambdabase.com/tools/promptfix