How do I check my phone's refresh rate?

Open this Phone Hz Test in your mobile browser. The tool uses requestAnimationFrame timing to precisely measure how fast your phone's display is actually refreshing — in real time. No app download needed.

What is LTPO refresh rate?

LTPO (Low Temperature Polycrystalline Oxide) is a display technology that lets phones dynamically switch their refresh rate — from as low as 1Hz when displaying a static image to 120Hz during scrolling or gaming. This saves battery while maintaining smooth motion. iPhones from Pro models (iPhone 13 Pro+) and Samsung Galaxy S22+ use LTPO.

Is 120Hz better than 90Hz on phones?

Yes, 120Hz provides noticeably smoother scrolling, animations, and gaming compared to 90Hz. The difference is especially noticeable when scrolling through social media feeds or playing fast games. However, 120Hz uses more battery. Many flagships now offer LTPO displays that automatically switch between Hz levels.

What is stutter jitter on a phone display?

Stutter jitter is the inconsistency in frame delivery — measured in milliseconds (ms). A low jitter value (under 1ms) means frames are delivered perfectly evenly. High jitter causes perceived stutter even if the average Hz is correct. This test measures the standard deviation of your frame times.

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Phone Screen Hz Test — Mobile Refresh Rate & LTPO Checker

Free phone screen Hz test. Measure your mobile display's real refresh rate, stutter jitter, and LTPO dynamic Hz changes — 60Hz, 90Hz, 120Hz, 144Hz. Works on iPhone, Samsung, Pixel and all Android devices.

DETECTED REFRESH RATE

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Live Real-Time Hz: — Hz

MIN RATE

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MAX RATE

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STUTTER JITTER

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TOTAL FRAMES

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FPS Consistency Wave

BACKGROUND COLORTip: Use Cyan or Lime to check LCD panel pixel response rate & ghosting

Detected Refresh Rate

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Snapped to nearest standard

Live Exact Hz

—Hz

Decimal-precision rAF timing

Frame Time

—ms

Time between frames

Stutter Jitter

—ms

✓ Frame timing consistent

LTPO Status

Measuring…

LTPO panels dynamically switch Hz. Watch the live counter change when your screen is idle vs active.

Session Frames

0frames

Counted since last reset

Phone Screen Hz Test — What It Measures

This free phone screen Hz test measures your mobile display's actual refresh rate in real time using the browser's requestAnimationFrame API. Unlike OS settings menus which only show your configured maximum Hz, this tool shows the actual live Hz — including when LTPO panels dynamically switch between rates.

What is LTPO and Why Does It Matter?

LTPO (Low Temperature Polycrystalline Oxide) is the panel technology behind adaptive refresh rate on modern flagship phones. An iPhone 15 Pro or Samsung Galaxy S24 Ultra will dynamically vary from 1Hz on a static lock screen to 120Hz during scrolling — saving battery life while maintaining smoothness. Use this test to watch your phone's Hz change as you interact with the browser.

What is Stutter Jitter?

Stutter jitter is the standard deviation of your frame delivery times. Even if your phone averages 120Hz, inconsistent frame delivery creates perceived stuttering. A jitter value under 1ms is excellent. Values above 3ms may indicate thermal throttling, background app interference, or display driver issues.

Hz Visual Smoothness Comparison

The moving objects section lets you visually compare your screen's refresh rate against 60Hz and 30Hz reference speeds. Switch between UFO, Ball, and Bar animations, and try different background colors — Cyan and Lime are especially useful for revealing LCD pixel ghosting and overdrive artifacts on your phone's panel.

Phone Refresh Rate Guide

60Hz — Standard. Common on mid-range and budget phones. Adequate for everyday use.
90Hz — Noticeably smoother scrolling. Common on mid-range flagships.
120Hz — Flagship standard. Very smooth for gaming and social apps.
144Hz — Gaming-focused phones (ASUS ROG Phone, RedMagic series).
1–120Hz LTPO — Adaptive. Battery efficient with dynamic Hz switching.