RoastLog

A home coffee roast profile tracker that builds your recipe book

A roast profile is just a story told in numbers: when you charged, when first crack happened, when you dropped, and how much weight the beans gave up along the way. Track those consistently and a vague hobby turns into a repeatable craft. RoastLog is a private, offline profile tracker that keeps every batch in one searchable history so you can reproduce your best roasts and learn from the ones that missed.

Open the profile tracker →

From one-off roasts to a real recipe book

Most home roasters lose their best results because they never wrote down what they did. By logging green and roasted weight, charge and drop temperatures, first crack and drop times, and a quick tasting note, you build a profile you can return to. Next time that same Ethiopian comes in, you start from your proven numbers instead of from scratch.

The three numbers that drive flavor

Weight loss % — your at-home gauge of roast degree, computed instantly from green and roasted weight.
Development time ratio (DTR) — the share of the roast spent after first crack, the lever that balances acidity and sweetness.
Total roast time — paired with charge and drop temps, it tells you whether a profile was fast and bright or slow and baked.

weight loss % = (green − roasted) / green × 100 DTR % = (drop − first crack) / drop × 100

Compare beans and tighten your profiles

Once you have a few roasts logged, patterns appear. Pro unlocks per-bean averages and a sortable comparison table, so you can see — across every batch of a given coffee — your typical weight loss, your average DTR, and which profile earned the highest rating. That feedback loop is how home roasting gets dialed in.

RoastLog stores everything locally in your browser. No account, no sign-in, no data leaving your device. Free forever for unlimited logging; Pro is a one-time nine-dollar unlock.

Track your next roast profile →