Last updated: 2026-09-14
PromptFix is a platform that grades AI prompts for reliability before a team ships them to production, then compares how the same prompt performs across three leading LLM providers. It targets developers and prompt engineers who need a repeatable check before prompts reach customer-facing products.
About PromptFix
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 problem most AI practitioners face: prompts that work once but produce inconsistent results at scale. The platform's scoring engine breaks every prompt into specific, actionable fixes rather than vague suggestions.
The platform works through a web-based interface or a REST API, where the engine returns a scored breakdown with recommendations for improving each prompt before it reaches production. It 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.
Gamified daily challenges help teams onboard junior staff to prompt engineering practices through structured exercises rather than trial and error. Enterprise plans layer SSO, audit logs, and custom integrations on top of the standard feature set, aimed at larger organizations that need compliance sign-off before adopting a new prompt tool.
Pricing
Free: no cost, 15 AI improvements a month (analyses or fixes), 25 of the 300+ templates, and community support. Starter: $9/month, 100 AI improvements a month, full access to the 300+ template library, compares up to 3 models, and 10 custom templates. Pro: $29/month, unlimited AI improvements, compares up to 6 models, the image-to-prompt Reverse Prompt tool, unlimited custom templates, REST API access, and priority support.
Enterprise: custom pricing with unlimited team members, SSO and SAML, custom integrations, and a dedicated account manager.
| Tier | Monthly price | What it includes |
|---|---|---|
| Free | Free | |
| Starter | $9/mo | |
| Pro | $29/mo | |
| Enterprise | Custom |
Key Features
- AI Reliability Scoring: Scores every prompt 0-100 for reliability, hallucination risk, and constraint coverage, then returns specific fixes instead of vague suggestions.
- Multi-Model Comparison: Runs the same prompt against GPT, Claude, and other models side by side; Starter compares up to 3 models and Pro compares up to 6.
- A/B Testing for Prompts: Runs controlled experiments across prompt variants with automated scoring to identify which version performs better at scale.
- Prompt Versioning and History: Tracks every prompt edit, compares reliability scores across versions over time, and retains the top-performing variant.
- Reverse Prompt: Pro-tier feature that turns an uploaded image into a prompt engineered to recreate it, for reverse-engineering a visual style into reusable prompt text.
- REST API Access: Pro-tier REST API for programmatic integration with CI/CD pipelines, internal apps, and automated prompt-validation workflows.
- Template Library: 300+ prompt templates covering a range of use cases; the free plan includes 25 of them, with full library access starting on the Starter plan.
- Preference Profiles: Saves tone, brand guidelines, and other settings as a reusable profile so prompt output stays consistent across a project.
- Chrome Extension: A browser extension that optimizes prompts directly inside ChatGPT, Claude, Gemini, and similar chat interfaces.
- Certified Professional Credential: Pro-tier verifiable certification that prompt engineers can add to a resume or professional profile.
Pros
- The free tier requires no credit card and includes 15 AI improvements a month, making it easy for solo developers to test PromptFix's scoring before committing to a paid plan.
- The Pro plan bundles unlimited AI improvements with the REST API and priority support in a single $29 tier, while competitors like PromptLayer charge separately for API access.
- Comparing prompts across GPT-4, Claude, and Gemini in one run saves time for teams deploying to multiple providers and needing to confirm prompt portability before launch.
- The REST API at the Pro tier plugs prompt validation directly into CI/CD pipelines, catching regressions before they reach production users.
Cons
- The free plan's monthly improvement cap is too low for active development cycles, forcing an upgrade to Starter even for modest personal use.
- PromptFix has no native desktop or mobile app: it works as a browser-based, installable home-screen shortcut rather than an App Store or Google Play download.
- Company transparency is limited: no public founding date, funding history, or team page, making it harder for enterprise buyers to assess vendor stability before signing custom contracts.
- Multi-model comparison and the Reverse Prompt tool require at least the Starter or Pro plan, so solo users who need those beyond the free scoring cap must pay $9 or more a month.
Data Handling
- Compliance
- SSO & SAML (Enterprise tier)
Frequently Asked Questions
What are PromptFix's pricing plans in 2026?
Free costs nothing, Starter is $9 a month, and Pro is $29 a month with unlimited AI improvements and REST API access. Enterprise is quoted individually and adds unlimited team members, SSO and SAML, custom integrations, and a dedicated account manager.
Does PromptFix have a free plan?
Yes. It includes 15 AI improvements a month (analyses or fixes) and 25 of the 300+ templates, with no card required. Multi-model comparison, full template access, the Reverse Prompt tool, and the REST API stay on the paid plans.
What should you use instead of PromptFix?
PromptLayer suits teams that need deep request logging and LLM observability in production, and Langfuse offers deeper tracing for complex agentic workflows. PromptPerfect, a past consumer-facing prompt optimizer, shut down on September 1, 2026 after Jina AI's acquisition by Elastic, leaving PromptFix among the few tools focused purely on prompt scoring rather than full observability.
Is PromptFix better than LangChain?
LangChain is a broader agent orchestration framework for building and evaluating AI agents end-to-end, while PromptFix is a narrower tool focused specifically on scoring, versioning, and A/B testing individual prompts before they reach an agent or application. Teams already building on LangChain can still run PromptFix as a pre-flight check on prompt quality, but LangChain offers far more infrastructure for operating agents in production. PromptFix earns its place when the bottleneck is prompt reliability rather than agent orchestration.
How do you set up PromptFix?
Open the free plan at promptfix.online, paste an existing prompt into the scoring interface, and read the clarity, structure, and specificity breakdown it returns. Starter unlocks multi-model comparison across GPT, Claude, and other providers; Pro adds the Reverse Prompt tool and the REST API.
Top Alternatives
- LangChain: LangChain is the full agent orchestration framework; PromptFix handles standalone prompt scoring and versioning without adopting one.
- Crukx: Crukx covers production LLM observability across models and agents, while PromptFix stays a lighter pre-deployment scoring and comparison workflow.
- Openlayer: Openlayer provides compliance-grade evaluation and guardrails; PromptFix does fast multi-model prompt comparison without a governance layer.
HokAI guides covering PromptFix
- AI Development Services in 2026: Which Layer You Actually Need: AI development services means four separate infrastructure layers, not one purchase: sandboxing, prompt testing, workflow durability, and API governance.