Brewing Great Coffee at Home
Stop settling for bitter, muddy cups. Learn the simple mechanical levers that control coffee extraction, how to diagnose flavor problems, and how to buy fresh beans with confidence.
Like Duolingo, but for Brewing Great Coffee at Home. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 9 levels across 2 sections, about 18 minutes end to end, roughly 4 days at five minutes a day. It moves through Dialing In the Cup and Choosing Beans You Actually Like. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in Brewing Great Coffee at Home
- Coffee beans vary in density depending on roast level and origin
- A volumetric scoop holds a different mass of coffee depending on how dense the beans are
- Weighing coffee on a scale guarantees the exact same amount of coffee goes into every brew
- Finer coffee grounds pack tighter, restricting water flow and exposing more surface area for fast extraction
- Coarser coffee grounds leave wide channels for water to drain quickly, requiring longer contact time to extract flavor
- Water directly at a rolling boil tends to over-extract harsh, dry astringency from coffee grounds
- Letting freshly boiled water rest for roughly 30 seconds brings it to an ideal temperature that draws out sweetness and pleasant aromatics
- Changing multiple coffee brewing variables at once hides which adjustment actually solved or caused the problem
- Adjusting a single lever (like grinding one click finer) isolates the specific cause of a bad cup
- Fruity and sour acids dissolve almost immediately when water hits coffee
- Sweet sugars extract next to balance the cup
- Harsh bitter plant matter dissolves last if brewing continues too long
- A sour, puckering taste indicates under-extraction in brewed coffee
- The brew finished before water had enough time to extract the balancing sweet sugars
- Sour acids extract first without sweet sugars to balance them out
- Dry, scratchy bitterness and ashy notes indicate over-extracted coffee
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Brewing Great Coffee at Home the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
You use the exact same plastic scoop for two different bags of coffee. What happens to the actual amount of coffee you get?
Get it right to open this lesson and 8 more in the app.
Where Brewing Great Coffee at Home takes you
- 1
Dialing In the Cup
- The Three Levers of Everyday Brewing
- Diagnosing Sour vs. Bitter
- 2
Choosing Beans You Actually Like
- Decoding the Roast Spectrum
- Reading a Coffee Bag
2 sections · 4 units · 9 levels. Built to play, not to enroll.
You pick the voice
Brewing Great Coffee at Home is taught in the The Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Brewing Great Coffee at Home today.
Download Tomo, search Brewing Great Coffee at Home, and play your first lesson in under a minute.