BrewMark vs Coffee Ratio Apps: Why Grind Size Matters More Than You Think

If you've used a coffee brewing app before, it probably asked you two questions: how much coffee are you using, and how much water?

That's useful information. The coffee-to-water ratio determines strength. Too much water and your coffee tastes weak. Too little and it's overpowering. Most brew apps are built around helping you get this ratio right.

But here's the thing: ratio apps assume you've already dialed in your grind size. And for most people brewing at home, grind is the variable they're getting wrong — not ratio.

BrewMark is built differently. It's designed around grind size as the primary variable, with ratio and brew time as supporting factors. This guide explains why that approach works and when it matters.

The ratio apps vs grind-focused apps difference

Most coffee brewing apps fall into one category: ratio calculators. You tell them your dose or water volume, they give you the missing variable. Some add brew timers or step-by-step guides. A few include recipe libraries.

What they don't do: help you figure out what grind setting to use, or tell you how to adjust it when your coffee tastes wrong.

Grind-focused apps (BrewMark being the main example) start with a different premise: the reason your coffee doesn't taste right is probably your grind size, not your ratio. They let you log grind settings, track how changes affect flavor, and get specific feedback on what to adjust.

The difference isn't just philosophical — it's about which problem you're actually trying to solve.

Why grind matters more than ratio (most of the time)

Coffee extraction is controlled by three primary variables:

1. Grind size — how much surface area is exposed to water
2. Brew time — how long water is in contact with coffee
3. Ratio — how much coffee vs water you're using

Ratio determines strength. If your coffee tastes weak but otherwise balanced, you need more coffee or less water. This is straightforward to fix and it's something people learn to eyeball after a few brews.

Grind size and brew time determine extraction quality. If your coffee tastes sour (under-extracted) or bitter (over-extracted), changing the ratio won't fix it. You need to adjust grind size, which changes how quickly water extracts flavor compounds.

Here's the problem: most people brewing at home get the ratio roughly right but miss on grind size by a lot. They follow a recipe that says "medium grind" and set their grinder to what looks medium, but "medium" on a Baratza Encore is completely different from "medium" on a Comandante. The result is under-extracted sour coffee or over-extracted bitter coffee, and they don't know what to change.

Ratio apps can't help with this because they don't handle grind size. Grind-focused apps can, because they track what setting you used and suggest adjustments based on tasting feedback.

What ratio apps do well

Let's be clear: ratio calculators are useful. If you're new to brewing coffee and you don't know what ratio to use for V60 vs French press, a ratio app (or web tool like BrewMark's Brew Calculator) will get you in the right ballpark fast.

They're especially helpful when:

• You're learning a new brew method and don't have ratios memorized
• You're scaling a recipe up or down (brewing 30g instead of 15g)
• You want to experiment with different strength profiles (1:15 vs 1:17)

The best ratio apps also include brew timers and pour schedules, which help you execute a recipe consistently. This is valuable — consistency is half the battle when you're dialing in.

What they don't do: tell you whether your grind size is appropriate for that ratio, or what to change when your coffee tastes wrong.

What BrewMark does differently

BrewMark starts with grind size as the main variable you track. When you log a brew, the app asks for:

1. Grind setting (translated to a universal 0-100 scale so it works across grinders)
2. Dose (how much coffee)
3. Extraction feedback (how did it taste?)

Based on that, it suggests what to adjust next — usually grind, sometimes dose or brew time.

The grind translation is the technical piece that makes this work. Every grinder uses different units: Comandante uses clicks, Baratza uses numbers, 1Zpresso uses different clicks. BrewMark normalizes all of this to a universal index so you can track your setting across different equipment and follow recipes regardless of what grinder the recipe author used.

If a recipe says "grind index 45" (typical pour over range), the app tells you that's:

• Comandante C40: ~22 clicks
• Baratza Encore: ~14
• Fellow Ode Gen 2: ~4
• 1Zpresso JX: ~24 clicks

Same grind size, different numbers. The Grind Converter handles the translation. Once you log a brew at that setting, the app remembers it and uses it as your baseline for the next bag of coffee.

This is what ratio apps don't do: they can't tell you what grind setting to use, because grind settings are equipment-specific and there's no universal reference.

When grind-focused apps actually help

Grind-focused apps are most useful when you're dialing in new beans. Every bag of coffee extracts differently. A light roast Ethiopian needs a finer grind than a dark roast Brazilian, even for the same brew method. When you open a new bag, you're re-dialing every time.

Here's what that looks like with a ratio app:

1. Use a recipe that says "medium grind"
2. Set your grinder to what you think is medium
3. Brew according to the ratio
4. Coffee tastes sour → you guess that you should grind finer, but you don't know by how much
5. Adjust blindly, brew again, hope it's better
6. Repeat until you get it right (usually 3-5 brews wasted)

Here's what it looks like with BrewMark:

1. App suggests a starting grind based on your last bag and the brew method
2. Brew, taste, log feedback ("too sour")
3. App says "grind 3-5 points finer" (specific, actionable)
4. Adjust, brew again
5. Usually dialed in within 2 brews

The difference is specificity. Instead of "try grinding finer," you get "move from grind index 47 to 43" — which translates to an exact number of clicks or notches on your grinder.

When ratio apps are enough

If you're brewing the same coffee the same way every day and you're already dialed in, a ratio app (or just memory) is fine. You don't need grind tracking when you're not changing anything.

Ratio apps are also sufficient if:

• You're only trying to learn basic ratios for different brew methods
• You don't care about optimization — you just want consistent, decent coffee
• Your main problem is actually ratio-related (coffee too weak or too strong)

For people in this category, BrewMark's free Brew Calculator is probably all you need. No app required, just a web tool that gives you ratios and brew times.

The hybrid approach

The ideal coffee app would blend both: grind tracking with ratio calculation and brew timing. That's essentially what BrewMark is — it's not just a grind converter, it's a full dial-in journal that includes dose, water, and extraction time alongside grind size.

But it starts with grind because that's the variable most people get wrong and most apps ignore.

If you've been using a ratio app and your coffee still doesn't taste right, the problem is probably grind. No amount of ratio tweaking will fix under-extraction or over-extraction — you need to adjust particle size.

Which one should you use?

Use a ratio app (or ratio calculator) if:

• You're new to brewing and learning basic ratios
• You're happy with your coffee's flavor and just need help scaling recipes
• You don't want to track variables over time

Use BrewMark if:

• You're dialing in new beans regularly (every 1-2 weeks)
• Your coffee tastes sour or bitter and you don't know how to fix it
• You want specific, actionable feedback on what to adjust
• You own a burr grinder with adjustable settings (if you're using a blade grinder, grind tracking won't help)

Use both if:

• You're serious about coffee and you want ratio guidance + grind tracking

The free web tools (Brew Calculator and Grind Converter) work for most casual brewers. The full BrewMark app is for people who want systematic dial-in tracking.

The real takeaway

Ratio apps are useful, but they solve the easier problem. Most people can learn ratios in a weekend. Dialing in grind size takes longer and requires more iteration.

If your coffee doesn't taste the way you want it to, check your grind size before you blame your ratio. Grind is almost always the culprit.

Want to see how grind size affects different brew methods? Read our Complete Coffee Grind Size Chart or try the Grind Converter to translate settings for your grinder.