Support

For questions or bug reports, email contact@stack-works.dev. It helps if you include your iPhone model, iOS version and what happened. The app is in Japanese.

FAQ

How is the next move decided?

From where you tap on the taste map (sour or bitter, weak or strong), the app estimates whether extraction was too low or too high, and the strength. Grind, temperature and time move extraction and strength together; the coffee-to-water ratio moves them in opposite directions. Based on this, the app suggests one value to change at a time, also considering the drawdown time, days since roasting and TDS if you entered it. Suggestions are estimates; your palate has the final say.

What is "one step" of grind?

In Settings, choose your grinder's step (1, 0.5 or 0.1) and whether a smaller number is finer.

The Lock Screen doesn't advance

The app updates the Lock Screen and Dynamic Island at each step. While you are away from the app, it sends a notification at each pour and shows a countdown to the next pour on the Lock Screen. If notifications don't arrive, check Settings > Notifications on your iPhone.

How do I restore Plus?

Open Settings in the app, then Brew Lab Plus, and tap Restore Purchases, signed in with the same Apple Account you used to buy it.