# zerobrew: coffee dial-in — Fix sour or bitter espresso

> Fix sour or bitter espresso (iPhone/iPad app by Muhammed Bozkurt.)

- Source: https://appshunter.io/ios/app/zerobrew-coffee-dial-in/id6778383960 (this page in markdown: same URL + `.md`)
- Developer: [Muhammed Bozkurt](https://appshunter.io/developer/1808955530)
- Category: Food & Drink, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 51 MB
- Languages: American English, French (France), German (Germany), European Spanish, Turkish
- Released: 2026-06-13
- Data updated: 2026-09-03
- User reviews in markdown: https://appshunter.io/ios/app/zerobrew-coffee-dial-in/id6778383960/reviews.md

## What is zerobrew?

Your coffee tasted sour again. Or bitter. And you have no idea what to change: the grind, the water temperature, the ratio, the time.

Most people change three things at once and hope. zerobrew replaces the guessing with one clear instruction.

HOW IT WORKS
1. Log the brew: dose, yield, time, grind setting, water temperature.
2. Say how it tasted: sour, balanced or bitter.
3. Get the fix. Sour means under extracted, so grind finer. Bitter means over extracted, so pull less out. One change, not five.
4. Brew again and tell zerobrew whether it worked. The next suggestion is built on that answer.

Sour is under extraction. Bitter is over extraction. zerobrew reads your numbers next to your taste note, then tells you which knob to turn and in which direction.

WHAT YOU GET
Dial-in coach on the home screen, ready before your first tap
Taste diagnosis (sour, balanced, bitter) with a concrete next step
Advice that remembers: if a change worked, the next move gets smaller, and if the cup got worse, the direction flips
Guided first brew that walks you from bean to diagnosis
Brew log for dose, yield, time, grind setting, water temperature and rating
Bean shelf with roast dates and freshness, from resting to past peak
Grinder tracking, so every grind setting stays tied to the right grinder
Brew scores, streaks and achievements
Shareable recipe cards with the diagnosis badge
Starter recipes and a short setup quiz, so your first recipe already fits your gear
Step by step brewing guides for every method

METHODS
Espresso, V60, AeroPress, Chemex, French press, Moka pot and cold brew.

FREE AND PRO
Free every day: one brew log, up to three beans, the brewing guides, the starter recipes, and your first dial-in fix shown in full with its steps.

zerobrew Pro adds:
Unlimited brew logs and beans
Every dial-in suggestion, on every brew
What changed between your best and your worst brew, side by side
Insights: trends over time, method breakdown, top beans
CSV export of your whole brew history

Pro comes with a 7 day free trial. Monthly, annual and lifetime options.

PRIVATE BY DEFAULT
No account, no sign up, no cloud. Your beans and brews stay on your device.

Coffee gets better when you stop changing five things at once. Log one brew, taste it, change one thing.

Privacy Policy: https://greeneyeapp.com/en/legal/zerobrew-privacy
Terms of Use (EULA): https://greeneyeapp.com/en/legal/zerobrew-terms

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| zerobrew Pro Monthly | $4.99 | per month |
| zerobrew Pro Annual | $29.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| zerobrew Pro Lifetime | $49.99 | one-time |



## Version history (last 5 releases)

### 2.0.0 — 2026-09-01

2.0 turns zerobrew from a brew log into a coach.

- Dial-in coach on the home screen: last brew, taste and next move, one tap away
- Guided first brew, from bean to diagnosis
- Advice that looks back: smaller step if it worked, reverses if the cup got worse
- Best vs worst brew, side by side (Pro)
- Share cards now carry a diagnosis badge

### 1.6.1 — 2026-07-19

• Permission dialogs now appear in your language
• Small fixes and polish

### 1.6.0 — 2026-07-13

A fresh brew of updates:
- Log one brew every day for free (the old lifetime limit is gone)
- New quick setup quiz with a starter recipe made for you
- Starter recipes for every method in the guide
- Insights and dial-in tips now show a real preview
- Optional reminders: streak and bean freshness peak
- Monthly brewing recap and shareable recipe cards
- Pro yearly now starts with a 7-day free trial
Plus fixes and a smoother app.

### 1.5.0 — 2026-06-29

See exactly what to change next as zerobrew reads your dose, yield and time, follow a guided pour timer step by step, save your grinders so it remembers the best grind for each coffee, open any coffee for its history and best recipe to brew again or share, and get an instant extraction verdict on every brew. The dial-in coach is free to try.

### 1.3.0 — 2026-06-17

New in this version
• Dial-in assistant (Pro): after a sour or bitter brew, zerobrew tells you exactly what to change next time.
• Insights (Pro): see your brew trends, method breakdown and best beans.
• Bean freshness: every bean now shows where it sits in its freshness window.
• Flexible Pro: monthly, yearly, or a one-time Lifetime purchase.
• Polish and fixes.

Brew better, one shot at a time.

## Apps similar to zerobrew

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Ratio, Nau: Specialty Coffee](https://appshunter.io/ios/app/ratio-nau-specialty-coffee/id6780601728) | — | Free | Food & Drink |
| [Sixteen to One](https://appshunter.io/ios/app/sixteen-to-one/id6760734071) | 5.0 (1) | Free | Food & Drink |
| [CoffeeMan: Espresso Tracker](https://appshunter.io/ios/app/coffeeman-espresso-tracker/id6767023560) | — | Free | Food & Drink |
| [Coffee Ratio - Brew Calculator](https://appshunter.io/ios/app/coffee-ratio-brew-calculator/id6768997826) | — | Free | Food & Drink |
| [BrewCoach: Coffee Brew Timer](https://appshunter.io/ios/app/brewcoach-coffee-brew-timer/id6786765081) | — | Free | Food & Drink |
| [Brewory: Tea & Coffee Timer](https://appshunter.io/ios/app/brewory-tea-and-coffee-timer/id6784574616) | — | Free | Food & Drink |

## More apps by Muhammed Bozkurt

- [SoulLens: AI Face Analyzer](https://appshunter.io/ios/app/soullens-ai-face-analyzer/id6744700178)
- [Combina](https://appshunter.io/ios/app/combina/id6747253602)
- [zerogram: Pack Weight Tracker](https://appshunter.io/ios/app/zerogram-pack-weight-tracker/id6777978381)
- [zerospike: Blood Sugar Diary](https://appshunter.io/ios/app/zerospike-blood-sugar-diary/id6778782351)
- [Statura: Posture Corrector](https://appshunter.io/ios/app/statura-posture-corrector/id6787974562)

All apps by Muhammed Bozkurt: https://appshunter.io/developer/1808955530

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-03.*