About PromptCompass
An open, free, sincere project with one goal: reduce the uncertainty of using AI — which model, which prompt, with evidence.
FAQ
Is PromptCompass really free?
Yes, completely. No account, no subscription, no ads, no tracking. It runs on free hosting and the optional auto-run features use your own free API keys (Google AI Studio, Groq). There is nothing to sell you.
Where do my data and API keys go?
Nowhere. Everything — goals, prompts, comparisons, chains, keys — lives in your browser's local storage. There is no PromptCompass server. API keys are sent only to the provider you call (Google, Groq or OpenRouter), directly from your browser.
Why are generated prompts in English?
Every major model performs measurably best with English instructions. Each generated prompt includes a rule telling the AI to answer in the language of your task — so you can write your goal in any language and get the answer in your language, with English-optimized instructions doing the heavy lifting.
How reliable are the benchmark numbers?
Where public leaderboards publish a score (LMArena, SWE-bench, Artificial Analysis) we use it and link the source. Where they don't — private, preview, rumored or niche models — we show a clearly marked estimate ("~", "est."). Data is refreshed roughly monthly; the snapshot date is always shown.
What do the category scores and labels mean?
Each model in the database gets one overall score (Artificial Analysis Intelligence Index where published) plus four category ratings — Coding, Reasoning, Writing, Agents & tools — on a 0–100 scale. Category ratings are PromptCompass blends of public category leaderboards and editorial judgment: use them to compare models at a glance, not as official measurements. Labels (like "free", "open weights", "in Generator") are filters: "in Generator" means you can generate optimized prompts for that model family right here.
Do I need API keys to use this?
No. Copy & paste works with every model. Keys only add convenience: with free Google AI Studio, Groq or OpenRouter keys, Compare and Chains can run Gemini, Llama and several open models (Nemotron, Qwen Coder…) automatically.
How does the model recommendation work?
A curated dataset translates public benchmarks into per-task rankings with a confidence level and linked sources. It is guidance, not gospel — near-ties are declared as ties, and the router never hides its reasoning.
Can I contribute?
Please do — see below. Ideas, corrections, new models for the database, translations: everything helps.
Similar tools — and what they do better
PromptCompass is not the only prompting tool. In the spirit of openness, here is the honest landscape:
- PromptPerfect — AI-powered engine that rewrites an existing prompt for maximum quality, including image prompts (Midjourney, Stable Diffusion).Better at: one-click automated optimization of a prompt you already have (paid credits).
- AIPRM — Chrome extension with 5,400+ curated prompt templates inside ChatGPT.Better at: ready-made templates with one click in the browser, if you live in ChatGPT (from $20/mo).
- PromptBase — marketplace of expert-crafted, human-reviewed prompts ($1.99–9.99 each).Better at: buying one proven prompt for one specific job, with example outputs.
- PromptLayer — Git-style prompt versioning and observability for teams.Better at: professional prompt lifecycle management for developer teams shipping LLM apps.
- Anthropic Console & OpenAI Playground — the vendors' own prompt-improvement and testing tools.Better at: testing with real API calls and vendor-official optimization for that one model.
What PromptCompass offers instead: prompts for 13 models from a single goal, benchmark-based model recommendations, side-by-side comparison and multi-step chains — 100% free, no account, everything in your browser.
Contribute & contact
PromptCompass is open source and built in public. Suggest features, report wrong data, add models to the database, improve translations — or just say what confused you: