Nurunuru Checker
Test 120Hz ProMotion displays
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Check whether your iPhone or iPad screen really runs at 120Hz, with live FPS measurement and visual tests.
Is your iPhone or iPad really displaying smoothly?
Even on a "ProMotion 120Hz" display, the screen does not always run at its top speed. Nurunuru Checker shows your device's actual refresh rate and rendering, measured on the device itself.
■ Free
- Live FPS / refresh rate measurement
See the frame rate actually shown on screen, with average, minimum and maximum FPS, frame time and jank count.
■ Premium features (unlock everything for 24 hours by watching one ad, or permanently with a one-time purchase)
- ProMotion Min/Max Test
Ask the display for its highest and lowest refresh rates and compare the smoothness with a moving bar.
- Motion Blur & Response Test
Check motion blur (ghosting) and response with moving objects.
- Sustained & Throttling Test
Graph FPS over time to see performance drops caused by heat (throttling).
- Full-screen Check Patterns
Find dead pixels and uneven colors with solid colors, gradients and grids.
- Bonus: Hoshimori Rinka Wallpaper
Save a wallpaper of Hoshimori Rinka from 3810 Production's Information Management Dept. to Photos.
■ Rinka Mode
Choose "Rinka Mode" in Settings to recolor the whole app in Rinka's colors and show her illustrations across the screens.
■ Recommended for
- People using a ProMotion iPhone or iPad Pro
- Checking the display of a new or used device
- Anyone who wants to see their device's smoothness in numbers and with their own eyes
■ Pricing
Free to use. Some features are unlocked for 24 hours by watching one ad.
The one-time in-app purchase "Unlock All Features" unlocks everything permanently and removes ads. On a new device, use "Restore purchase".
Privacy policy: https://3810.pro/privacy-policy/nurunuru-checker
Contact: https://3810.pro/contact
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
v1.10.0
・In the EEA, the UK and Switzerland, the app now asks for your consent before showing ads.
・In these regions, you can change your ad privacy settings from Settings.
The developer, 3810 Production, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 3810 PRODUCTION
- Size
- 20 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 3 more
- English, Japanese, Korean, Simplified Chinese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Unlock All Features $1.99
- Copyright
- © 2026 3810プロダクション