ISOTHERM — a specialty coffee roastery. Scroll to take a batch from ambient to drop.

Single origin · Drum roasted

A line joining every point of equal temperature.
We roast to the line, not to a colour.

Scroll to charge the drum

034°CDrying

Origin

Region
Nyeri County, Kenya
Altitude
1,780 – 1,920 masl
Varietal
SL28 · SL34
Process
Washed, 72-hour fermentation
Harvest
2026

Altitude is not a marketing number. Every 300 metres adds roughly a month to the cherry's maturation, and a month of maturation is what puts acid in the cup.

067°CDrying

Before heat, it is a seed

Moisture
11.2 %
Water activity
0.58 aw
Density
0.71 g/mL
Screen
17 / 18

Screen size is measured in 64ths of an inch. A screen 18 bean will not fit through an 18/64 mesh. Uniform size is not vanity — beans of different sizes take heat at different rates, and a batch that roasts unevenly tastes like two coffees at once.

093°CMaillard

Draw the roast

Development time ratio is the share of the roast that happens after first crack. Below 15 % the cup is sharp and grassy. Above 25 % it flattens into cocoa and loses the origin. Most of the argument in specialty coffee lives in that ten-point window.

Drag the four control points. Everything below is computed from the curve you draw — nothing is canned.

148°CFirst crack

The bean fails

Water inside the bean turns to steam faster than the cell walls can vent it. They rupture. You hear it before you see it — a sound like rain starting on a tin roof.

From here you have ninety seconds of real decision.

190°CDevelopment

What comes out

Blackcurrant · Bergamot · Cane sugar · Black tea

Recipe
18 g in · 46 g out · 2:15
Water
94 °C, 120 ppm total hardness
Extraction
21.4 %
TDS
1.38 %

Numbers do not taste of anything. They are how we make the same cup twice.

215°CDevelopment

Three coffees

  • Nyeri Ridge

    Kenya · Washed · 250 g

    RM 68

    Blackcurrant, bergamot, cane sugar

    DTR 19.4 %   Drop 232 °C

  • Huila Terrace

    Colombia · Honey · 250 g

    RM 62

    Red apple, panela, almond

    DTR 21.8 %   Drop 226 °C

  • Sidamo Lot 4

    Ethiopia · Natural · 250 g

    RM 74

    Strawberry, jasmine, black tea

    DTR 17.2 %   Drop 219 °C

Roasted Tuesdays. Shipped Wednesdays. Rested five days before it reaches you, because coffee is not ready the day it comes out of the drum.