Plate I
HARIO V60-02 · CERAMIC
Coordinate
35.6762° N, 139.6503° E
93°C · 18g · 300g · 3:30
珈琲器具研究
A Field Guide to Japanese Pour-Over
Brewed with the
precision of a
— laboratory.
Japanese Coffee Gear is a technical record of pour-over: the drippers, the geometry, the timing. We translate Hario's engineering notes, Tetsu Kasuya's 4:6 method, and the kissaten manuals nobody else reads in English — and we keep the only open dataset of where Japan grows and roasts its own coffee.
Farms
16 documented
Roasters
25 profiled
Sources
61 cited
§ I · Methods
Four cones,
one country.
Hario, Kalita, Origami, AeroPress. Each was engineered in a Tokyo or Saitama workshop to solve a specific extraction problem. Pick the wrong dripper for your bean and you waste $30 of single-origin. Pick the right one and breakfast becomes ceremony.
01
ハリオ
Hario V60
60° cone · 1 hole · spiral ribs
Bright, articulate, fast. Forgives dialed grind.
02
カリタ
Kalita Wave
Flat bottom · 3 holes · fluted
Even, balanced, beginner-proof. The forgiving cup.
03
折り紙
Origami
20 facets · V60 or Kalita filter
Mineta porcelain. The 2019 brewer's-cup ringer.
04
エアロ
AeroPress
Plunger · paper or metal · 1 cup
Not Japanese, but Tokyo loves it. Travel-tier.
Manifesto
NO. 001 · 2026
Coffee made well is not a drink — it is a record of geometry, temperature, and time. We document the people, presses, and paper filters behind every cup, translated faithfully and photographed in the daylight they were built for.
§ II · Recipe
The 4:6
method.
In 2016 Tetsu Kasuya won the World Brewers Cup with a recipe that ignored every Western pour-over orthodoxy. Five pours. Forty percent of the water for sweetness, sixty for strength.
Drag the first two pours to taste — wider for sweet, narrower for acidic. Adjust the last three for body. Same beans, twelve cups.
Open 4:6 calculator →§ III · Dispatches
What we are brewing this week.
guide
Bloom Time and Why It Matters in Pour-Over
Master pour-over bloom: 30-45 sec timing, 2:1 ratio, CO2 science, and how grind, bean age, and temperature change everything. Updated May 2026.
Field Notes
comparison
Cafec Flower vs Hario V60: Japanese Indie Showdown
Cafec Flower Dripper vs Hario V60 head-to-head: design, brew time, flavor profiles, prices, and which Japanese pour-over wins for your roast level.
comparison
V60 Filters: Tabbed vs Misarashi vs Bleached
V60 filter showdown: tabbed vs misarashi vs bleached. Drawdown deltas, taste impact, prices, and which to buy for clean cups vs body. Updated May 2026.
comparison
Hario Switch vs Clever Dripper: Immersion Compared
Hario Switch vs Clever Dripper compared after 40+ paired brews. Capacity, drawdown, heat retention, cup profile, and which immersion brewer to buy.
§ IV · The Origins Dataset
Where Japan
grows its own.
Japan grows coffee — in Okinawa, on the Ogasawara islands, on the slopes of Aso. Nobody had compiled it. We read the Japan Times, Sprudge, Typica, and a stack of producer websites, and built a structured record of every Japan-grown farm we could verify, plus the 25 roasters defining the country's third wave.
Every cell is source-cited. The raw data is openly licensed (CC-BY-4.0) — cite it, fork it, correct it. How we compile and verify →
CITE AS · Japanese Coffee Origins & Roasters Dataset v1.0, japanesecoffeegear.com, June 2026. CC-BY-4.0.
§ V · The Lab
Four small
calculators.
We build a tool only when a brew problem deserves one. Each is drawn from translated Japanese sources — Standart Japan, Coffee Beans Say, Tetsu Kasuya's YouTube — and tested on a kitchen scale before it ships.
4:6 Method Calculator
Enter your dose. Get five pour weights, five timing marks, and a ratio. Built on Kasuya's championship recipe.
Brew Ratio Solver
Solve any of: dose, water, ratio, output. Tabular, espresso through full-immersion.
Grinder Match
Tell us your dripper and bean. We return three hand-grinders that match — and one we'd rule out.
Dripper Decoder
V60, Kalita, Origami, Chemex, AeroPress. Translated and laid side by side.
§ VI · The Letter
One brew,
one Sunday.
A single translated dispatch each Sunday — one recipe, one roastery, one piece of gear we've been quietly testing. Never longer than a coffee break.