GrindLab
Food & Drink
Free · Designed for iPad. Not verified for macOS.
GrindLab turns your iPhone camera into a precision coffee grind analyzer. Snap a photo of your grounds and get instant, micron-level particle size measurements — no extra hardware needed.
ANALYZE YOUR GRIND
Use computer vision to detect individual particles and measure their size distribution. GrindLab calculates median size, uniformity score, fines percentage, and boulders percentage so you know exactly how consistent your grinder is performing. Calibrate with a coin or ruler for real-world micron accuracy.
FOUR GRIND PROFILES
Dial in for any brew method with built-in target ranges:
- Espresso: 170-300μm
- Filter/Pour-Over: 400-800μm
- French Press: 750-1000μm
- Cold Brew: 800-1200μm
TASTE-TO-GRIND RECOMMENDATIONS
Log how your coffee tastes — sour, bitter, balanced, weak — and GrindLab connects your flavor feedback to your grind data.
BREW TIMER & RECIPES
Time your brews with step-by-step guidance for V60, Espresso, French Press, and Chemex. Create custom recipes with your own ratios, steps, and notes. Live Activities put your timer on the Lock Screen and Dynamic Island so you never miss a pour.
BREW JOURNAL
Track every cup. Log your beans (roaster, origin, roast level, freshness), brew parameters (dose, yield, temperature, time), and tasting notes with star ratings. Search and filter your history to spot trends and refine your process over time.
COMPARE & IMPROVE
Save analyses and compare them side by side. Overlay distribution charts, view delta metrics, and set a baseline to track how grinder adjustments affect consistency. See your stats at a glance: total analyses, percentage in target range, and weekly trends.
DETAILED VISUALIZATIONS
Color-coded particle overlays show exactly where fines and boulders live in your sample. Distribution charts, histograms, and pie charts make your data easy to understand and share.
PRIVACY FIRST
GrindLab processes everything on-device. Your photos and data stay on your iPhone. No account required. No tracking.
Whether you're a home barista chasing the perfect espresso or a pour-over enthusiast dialing in a new bag, GrindLab gives you the data to brew better coffee every day.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
This update sharpens grind-analysis accuracy. The median grind size (D50) now reads true instead of being pulled toward the occasional oversized fragment, your shape-quality settings now take real effect, and photos imported from your library are measured exactly like camera captures. It also tightens reliability across Settings, modal screens, and the brew timer — with safer resets, sliders that save dependably (including with VoiceOver), and extraction-math and stability fixes for more dependable readings.
The developer, Nathan King, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Nathan King
- Size
- 40 MB
- Category
- Food & Drink
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Nathan King