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🧪Web
Full-stack Developer2025

PromptLab

A developer toolkit for iterating on AI prompts: test variations side by side, track versions, and compare outputs so prompt engineering becomes measurable instead of guesswork.

Next.jsTypeScriptTailwind CSSOpenAI API
Deep dive

Case Study

Problem

Iterating on prompts in a chat window made it hard to compare versions or remember what worked.

Solution

Built a side-by-side testing grid with prompt versioning, saved runs, and diffable outputs.

Outcome

Turned prompt tuning into a repeatable, trackable workflow with a clear history of changes.

Key points

Highlights

  • Side-by-side prompt comparison
  • Version history with restore
  • Saved runs for regression checks