Melon Pitcher
Knock-Test Watermelon Ripeness
Only for iPhone
$3.99 · Designed for iPhone. Not verified for macOS.
iPhone
Knock once, know instantly. Melon Pitcher analyzes your watermelon's knock sound for ripeness and sweetness, fully offline, no account, results in seconds.
Stop guessing at the grocery store or the farm stand. Melon Pitcher turns your iPhone into a watermelon ripeness tester: knock on the rind three times, and the app analyzes the pitch of the sound to tell you how ripe the melon is and estimate its sweetness, right on the spot.
HOW IT WORKS Melon Pitcher listens through your iPhone's microphone as you knock on a watermelon. Using on-device frequency analysis (FFT-based pitch detection), the app measures the dominant knock frequency in the 200-350 Hz range associated with watermelon ripeness, then converts that into an easy-to-read ripeness level and an estimated Brix sweetness value.
FEATURES - Knock-based ripeness detection: three guided knocks, instant result - Four ripeness levels: Unripe, Raw-Ripe, Perfect Ripe, and Overripe - Estimated Brix sweetness value for each detection - Variety selector with frequency calibration for common US watermelon varieties (Crimson Sweet, Sugar Baby, Charleston Gray, Jubilee, Allsweet, Seedless, and General Watermelon) - Waveform chart comparing your knock to a reference perfect ripe waveform - Local detection history so you can track and compare past results - Light and Dark appearance, following your iOS system setting or locked manually - Adjustable detection sensitivity for quiet or noisy environments - Built-in user manual covering technique, troubleshooting, and tips
WHO IT'S FOR Anyone who wants a quick, practical second opinion before buying or cutting open a watermelon: shoppers at the grocery store or farmers market, home cooks, and watermelon enthusiasts who are tired of guessing from the field spot and dried tendril alone.
PRIVACY BY DESIGN Melon Pitcher works 100% offline for all detection features. There are no user accounts, no logins, and no personal information collected. Audio captured for analysis is processed entirely on your device and automatically deleted within 2 seconds of each detection. Your detection history is stored locally on your device only and is never uploaded anywhere.
ONE-TIME PURCHASE Melon Pitcher is a single, one-time purchase with no in-app purchases, subscriptions, or ads.
PLEASE NOTE Melon Pitcher provides a helpful estimate based on acoustic analysis of knock sounds. Results are for reference only and are not a guarantee of ripeness, sweetness, or food safety. Always inspect produce yourself before purchase or consumption.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Melon Pitcher now speaks your language!
This update adds full localization in six new languages:
Japanese (日本語)
Korean (한국어)
French (Français)
German (Deutsch)
Spanish (Español)
Portuguese, Brazil (Português)
The entire app is translated, including the detection flow and on-screen guidance, results and waveform screens, ripeness descriptions for all seven watermelon varieties, detection history, settings, the complete in-app user manual, and the microphone permission prompt. The app automatically follows your device language — no setup needed.
Your detection history now also displays dates and times in your regional format.
Everything else stays the same: 100% offline detection, no account required, audio automatically deleted within 2 seconds of analysis, and a single one-time purchase with no ads and no subscriptions.
Thanks for your support — and happy melon picking!
The developer, 朋亮 杨, 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
- 朋亮 杨
- Size
- 1.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 6 more
- English, French, German, Japanese, Korean, Portuguese, Spanish
- Age Rating
4+
- 4+
- Copyright
- © 2026 Daibou007 Team. All rights reserved.
