Perfect Your Coffee Roast, One Timer at a Time

Coffee Roast Timer is a free web app for home coffee roasters. It times each roast, logs events such as first crack and second crack as they happen, calculates the development ratio, and saves every batch as a roast profile you can compare, repeat, and share. Roasters can also browse profiles from people using the same machine.

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Features

• Roast timer with event logging

  Start a timer and mark first crack, second crack, temperature readings and setting changes as they happen. Bean origin, green and roasted weights, and notes save with the roast.

• Development ratio and weight loss

  The app calculates development time after first crack, development ratio, and weight loss so you can see how far each batch was taken.

• Roast profiles you can repeat

  Every saved roast becomes a profile with a timeline. Compare two roasts side by side and use a saved profile as the plan for your next batch.

• Community profiles by roaster

  Browse first-crack and drop times shared by other home roasters, filtered by roaster model and coffee origin.

• Cupping notes

  Record tasting and cupping notes against each roast to connect roast decisions to flavor in the cup.

Supported home coffee roasters

• Gene Cafe CBR-101 — Batch size, temperature settings and how to log a Gene Cafe roast in Roast Timer.
• Behmor 2000AB Plus — Profiles, extensions and the 75% prompt: how to log a Behmor roast in Roast Timer.
• FreshRoast SR800 — Batch size, a starting heat and fan schedule, and how to log SR800 changes in Roast Timer.
• KALDI Wide — Gas setup, temperature logging by voice or auto-record, and how to log a KALDI Wide roast.
• Hottop KN-8828B-2K+ — Auto and manual modes, logging bean temperature, and reading rate of rise for a Hottop roast.
• Air popcorn popper — Batch size, color cues and how to log a fast popcorn popper roast in Roast Timer.

Home roasting guides

• Your first roast with Roast Timer — Pick your roaster, time a roast, mark first crack and save it as a profile you can repeat.
• Fix early or late first crack — Find your first crack window, then adjust heat, airflow and batch size when it comes too early or too late.
• Diagnose a roast defect — Match what you taste and see to a likely cause, then change one thing on the next roast.
• Repeat or compare a roast — Use a saved profile as your plan for the next batch, and compare two roasts side by side.
• Add tasting notes to a roast — Score a roast, tag its flavors and link what you taste back to how you roasted it.
• Troubleshoot a Behmor roast — Fix late first crack, stalled roasts, uneven color and the Err 7 shutdown on a Behmor 2000AB.
• Popcorn popper safety checklist — Batch limits, ventilation and what to do if something goes wrong when roasting in a popcorn popper.
• What development ratio tells you — What development ratio is, how it's calculated, what ranges mean, and where it stops being useful.
• Roast numbers glossary — Every number Roast Timer shows, what it means and where to find it in the app.

Frequently asked questions

What is Coffee Roast Timer?

Coffee Roast Timer is a free web app for home coffee roasting. It times your roast, lets you mark first crack, second crack and temperature readings as they happen, and saves each batch as a roast profile you can review and repeat.

Is Coffee Roast Timer free?

Yes. All core features are free and no credit card is required. You can run the timer without an account; a free account is needed to save roasts and build your profile history.

Which coffee roasters are supported?

Coffee Roast Timer has dedicated setups for the Gene Cafe CBR-101, Behmor 2000AB Plus, FreshRoast SR800, KALDI Wide, Hottop KN-8828B-2K+, and air popcorn poppers. Any other roaster can be tracked with the general temperature-logging setup.

What is a development ratio in coffee roasting?

Development ratio is the share of total roast time that happens after first crack begins. For example, 4 minutes of development in a 15 minute roast is a 26.7% development ratio. Coffee Roast Timer calculates it automatically from the first crack and drop times you log.

Do I need to install anything?

No. Coffee Roast Timer runs in any modern web browser on a phone, tablet or computer, so you can keep it next to the roaster while you work.

Can I see other people's roast profiles?

Yes. The Discover page lists roast profiles shared by the community, filterable by roaster model and coffee origin, so you can see typical first crack and drop times on your machine.