HazeLog - Coffee Roast Curves

Save the roast you got right, curve and all. Roast alongside it next time. No probe, one-time purchase, no ads, data stays on device.

HazeLog is a roast-curve logbook for people who roast coffee on a stovetop pan, hand-net, or small home roaster. Save the roast you got right, then run alongside that curve next time to recreate it.

No temperature probe required. Tap large buttons to log charge, temperature spots, first crack, second crack and drop, and HazeLog turns them into a time-vs-temperature roast curve automatically. No thermometer? Your event timeline and DTR still make a complete record.

■ The ghost curve Mark a past roast as a target profile and HazeLog overlays it faintly on the live screen while you roast, showing the temperature gap and the time remaining to the next event (like first crack).

■ Features

• Live roast logging (large buttons, tap-to-undo)
• Roast curve with phase bands (drying / Maillard / development)
• Green bean master (origin, stock, auto-decremented per roast)
• Batch detail (automatic weight-loss %, roast level, tasting notes)
• Heat and damper operation log
• Automatic ROR / DTR analysis (Pro)
• Batch comparison view (Pro)
• CSV / PDF report export (Pro)

■ Quiet and yours alone HazeLog works fully offline and stores everything on your device only. No account, no ads, no notifications, no tracking.

■ Pricing Core logging, the curve and saving are free and unlimited. The ghost curve, analysis, comparison, export and unlimited beans beyond three unlock with a one-time Pro purchase (not a subscription).

HazeLog is a logging and visualization tool. It does not guarantee roast results.