Description

Roastline is a roast timer for home coffee roasters that learns from your own roasts. Tap charge, yellow, first crack and drop on the watch while you watch the beans, and Roastline shows the phase, the development time and the development time ratio live, and vibrates when your target ratio is reached so you know when to drop. For each bean it remembers batch size, target ratio and every roast. From earlier roasts of the same bean and batch it estimates when first crack will come, from the moment you marked yellow. After the roast you weigh the beans: the weight loss gives the roast degree and a resting window in days for filter or espresso. Score the cup later and Roastline shows which profile gave your best coffee. WHAT IT DOES - Roast timer with one tap per milestone: yellow, first crack, second crack, drop, with undo - First crack estimate from your own past roasts of the same bean and batch, with spread once there are enough roasts - Live development time and development time ratio, adjustable target per bean, warning 30 s before and a strong vibration at the target - Optional bean temperature entries with rise per minute between entries, in °C or °F - Weight loss to roast degree, and a resting window in days for filter or espresso - Up to 12 beans with their own profile, a log of 120 roasts, scores 1-5 and the best profile per bean - Phase split of every roast: drying, Maillard and development as share of the roast - Glance with the last roast and the days until it is ready to drink WHAT IT NEEDS A Garmin watch with Connect IQ 3.1 or newer. No sensors, no phone connection and no account; there is no temperature probe connection, temperatures are entered by hand. The roast degree and resting window are guidelines from published roasting practice, not a guarantee of taste.

Screenshots

Roastline - Home coffee roasting coach · Screenshot 0 Roastline - Home coffee roasting coach · Screenshot 1 Roastline - Home coffee roasting coach · Screenshot 2

Supported languages (5)

Deutsch English Español Français Nederlands

Compatible devices (186)

Approach® S50 Approach® S70 (42mm) Approach® S70 (47mm) D2™ Air D2™ Air X10 D2™ Air X15 D2™ Delta D2™ Delta PX D2™ Delta S D2™ Mach 1 D2™ Mach 1 Pro D2™ Mach 2 D2™ Mach 2 Pro Darth Vader™ Darth Vader™ Descent™ G2 Descent™ Mk1 Descent™ Mk1 Descent™ MK2 Descent™ MK2 Descent™ Mk2S Descent™ Mk2S Descent™ MK3 - 43mm Descent™ MK3i - 51mm Enduro™ Enduro™ Enduro™ 2 Enduro™ 3 epix™ (Gen 2) epix™ (Gen 2) epix™ Pro (42mm) epix™ Pro (47mm) epix™ Pro (51mm) fēnix® 5 fēnix® 5 fēnix® 5 Plus fēnix® 5 Plus fēnix® 5S Plus fēnix® 5S Plus fēnix® 5X fēnix® 5X fēnix® 5X Plus fēnix® 5X Plus fēnix® 6 fēnix® 6 fēnix® 6 Dual Power fēnix® 6 Pro fēnix® 6 Pro fēnix® 6 Pro Dual Power fēnix® 6 Pro Solar fēnix® 6 Solar fēnix® 6S fēnix® 6S fēnix® 6S Dual Power fēnix® 6S Pro fēnix® 6S Pro fēnix® 6S Pro Dual Power fēnix® 6S Pro Solar fēnix® 6S Solar fēnix® 6X Pro fēnix® 6X Pro fēnix® 7 fēnix® 7 fēnix® 7 Pro fēnix® 7 Pro – Solar Edition (No Wi-Fi®) fēnix® 7S fēnix® 7S fēnix® 7S Pro fēnix® 7X fēnix® 7X fēnix® 7X Pro fēnix® 7X Pro No Wi-Fi fēnix® 8 AMOLED (43mm) fēnix® 8 AMOLED (47mm/51mm) fēnix® 8 Pro fēnix® 8 Solar (47mm) fēnix® 8 Solar (51mm) fenix® 9 - 43 mm fenix® 9 – 47 mm fenix® 9 Pro - 43 mm fenix® 9 Pro - 47 mm fenix® 9 Pro - 51 mm fenix® 9 Pro - Solar 47 mm fenix® 9 Pro - Solar 51 mm fēnix® E First Avenger First Avenger ForeAthlete 245 ForeAthlete 245 Music ForeAthlete 645 ForeAthlete 645 Music ForeAthlete 745 ForeAthlete 935 Forerunner® 165 Forerunner® 165 Music Forerunner® 170 Forerunner® 170 Music Forerunner® 245 Forerunner® 245 Forerunner® 245 Music Forerunner® 245 Music Forerunner® 255 Forerunner® 255 Music Forerunner® 265 Forerunner® 265S Forerunner® 570 - 42mm Forerunner® 570 - 47mm Forerunner® 645 Forerunner® 645 Music Forerunner® 70 Forerunner® 70 Forerunner® 745 Forerunner® 935 Forerunner® 945 Forerunner® 945 Forerunner® 945 LTE Forerunner® 955 Dual Power Forerunner® 965 Forerunner® 970 Instinct® 3 – 45 mm, AMOLED Instinct® 3 – 50 mm, AMOLED Instinct® Crossover AMOLED MARQ® (Gen 2) MARQ® Adventurer (Gen 3) MARQ® Commander (Gen 2) – Carbon Edition MARQ™ Adventurer MARQ™ Adventurer MARQ™ Athlete MARQ™ Athlete MARQ™ Aviator MARQ™ Aviator MARQ™ Aviator (Gen 2) MARQ™ Captain MARQ™ Captain MARQ™ Commander MARQ™ Commander MARQ™ Driver MARQ™ Driver MARQ™ Expedition MARQ™ Expedition MARQ™ Golfer MARQ™ Golfer Mercedes-Benz Venu® Mercedes-Benz Venu® Mercedes-Benz Venu® 2 Mercedes-Benz Venu® 2 Mercedes-Benz Venu® 2S Mercedes-Benz Venu® 2S quatix® 6 quatix® 6X tactix® 7 tactix® 7 – AMOLED Edition tactix® 8 – 47 mm, AMOLED tactix® 8 – 51 mm, Solar Venu® Venu® Venu® 2 Venu® 2 Venu® 2 Plus Venu® 2 Plus Venu® 2S Venu® 2S Venu® 3 Venu® 3S Venu® 4 – 41 mm Venu® 4 – 45 mm Venu® Sq. Venu® Sq. Venu® Sq. Venu® Sq. Venu® Sq. 2 Venu® Sq. 2 Music Venu® Sq. Music Venu® Sq. Music Venu® Sq. Music Venu® Sq. Music Venu® X1 vívoactive® 3 vívoactive® 3 vívoactive® 3 Music vívoactive® 3 Music vívoactive® 3 Music vívoactive® 4 vívoactive® 4 vívoactive® 5 vívoactive® 6

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Snapshot dates
2026-10-27 → 2026-10-31