Introduction to PromptLab
PromptLab is a Prompt Engineering workbench that lets you design, test, compare, and evaluate prompts — all in one place.
What is PromptLab?
PromptLab is a hands-on workbench designed for anyone who works with large language models (LLMs) — students, researchers, developers, and practitioners. It brings together the most important prompt engineering workflows into a single, clean interface.
Instead of copying prompts between a notepad and a chatbot, PromptLab gives you structured tools: a layered prompt editor, a side-by-side comparison engine, an LLM judge for quality scoring, bias probing, adversarial testing, and scenario-based cases.
How it works
Every tool in PromptLab sends your prompt through a configurable model (Groq-hosted LLMs) and returns structured output. You control the model, temperature, and max tokens from the right-side Config panel.
Your API key is encrypted client-side before being stored — the server never stores your key in plaintext. Runs are authenticated via Firebase, and all your experiment history is persisted per account.
Tools overview
| Tool | What it does |
|---|---|
| Playground | Open chat interface for free-form prompting with mode controls |
| Prompt Tuning | Layered prompt architecture — System, Instructions, Examples, User Input |
| Compare | Run two prompts side-by-side and score the winner |
| Evaluate | LLM-judge scoring on Clarity, Relevance, Completeness, Creativity, Consistency |
| Bias Lab | Probe for implicit bias and apply mitigation instructions |
| Adversarial Lab | Test guardrail robustness against jailbreaks and injections |
| Cases | Real-world scenario library with built-in PE strategies |
Who is it for?
PromptLab is built for:
- Students learning prompt engineering fundamentals — test concepts hands-on
- Developers integrating LLMs — evaluate prompt reliability before production
- Researchers studying model behavior — bias detection, adversarial robustness
- Anyone who wants to write better prompts and understand why some prompts work and others don't
Quick start
- Go to Settings and add your Groq API key
- Open the Playground
- Type a prompt and click Run
- Try switching between Open-Ended and Closed-Ended modes and notice how the response changes