HazeLog - Coffee Roast Curves

Log, chart and repeat a roast

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Save the roast you got right, curve and all, then roast alongside it next time. Records stay editable and backup is free. No probe, one-time purchase, no ads. 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. A legend tells the two curves apart, and you see the temperature gap plus the time remaining to the next event. The current reading also shows when it was measured. ■ Features - Live roast logging (large buttons, tap-to-undo) - Resume an interrupted roast (a call or a restart no longer costs you the record) - Edit any saved roast (date, charge, roasted weight, roast level, event times and temperatures) - Backup and restore, free (carry everything to a new phone) - Roast curve with phase bands (drying / Maillard / development) - Green bean master (origin, stock, auto-decremented per roast, roast count per bean) - Roast photos, conditions (room temp, humidity, heat source, cooling) and flavor notes - Heat and damper operation log - ROR curve and phase ratio analysis (Pro) - Batch comparison view (Pro) - CSV / PDF report export (Pro) ■ Quiet and yours alone HazeLog works fully offline and stores everything, photos included, on your device only. No account, no ads, no notifications, no tracking. ■ Pricing Core logging, the curve, saving, backup, photos and conditions 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.

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Another pass at never losing a roast. - If the app closes after the drop, resuming now takes you to the post-roast record instead of the live screen (where the only way out was to discard) - New per-bean trends: tap a bean to see DTR, weight loss and total time over time, plus your most-used flavor notes - Home is grouped by month with that month's roast count - With a target profile, a short vibration comes 30, 10 and 3 seconds before the next event (optional, and silent) - Purchases completed outside the app (an approved request, or a purchase on another device) now apply right away - A roasted weight above the charge weight is no longer accepted - Delete confirmations now work with VoiceOver - Better layout at the largest text sizes, a cleaner add-bean screen, and temperature units in the PDF - Support address is now support@freetokyolabs.com

The developer, YANGLI CHEN, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    YANGLI CHEN
    Size
    2.4 MB
    Category
    Food & Drink
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 9 more
    • English, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2026, CHEN YANGLI. All rights reserved.