A free tool converts LLM prompt latency between ms, seconds, and minutes

What changed

A lightweight browser utility was released that converts raw millisecond durations from LLM API logs into seconds and minutes. You paste a value, it returns a readable breakdown. That is the whole product.

Why it matters

Most vibe-built apps live or die on perceived speed. When you are iterating fast in Cursor or Claude Code, you read response times directly off the network panel or a log line, and those are almost always in milliseconds. Doing the division in your head is a small tax that adds up over a build session, and worse, it tempts you to skip the check entirely. Skipping the check is how a 4.2 second prompt ships to production unnoticed.

What to watch for

Use this as a forcing function to build a real latency view into your own app, even if it is just a tiny debug overlay during development. Track p50 and p95 per prompt template. When you A/B a system prompt or swap models, compare the distributions, not a single sample. Treat any prompt that crosses the two-second mark as a feature decision, not just a performance number, because that is the threshold where your users start to feel the wait.