TrueHz: Hz & Refresh Rate Test

TrueHz — Refresh Rate Test & Hz Checker

See your screen's real refresh rate, measured live on your device — never guessed from its model name. Every number comes from a live Android API or a real measurement. If a value can't be read, TrueHz says so instead of making it up.

WHAT YOU CAN DO
• Live Hz meter — see the frame rate the system is actually delivering right now, smoothed over about a second, with frame-time jitter and sample count.
• Display report — the active mode, every supported mode (resolution + Hz), the refresh-rate range, and a tiered VRR breakdown: multiple rates per resolution, seamless switching, and Android 16 adaptive-refresh (ARR) capability — each reported separately.
• Visual smoothness test — a sweeping bar that lets you feel the difference between refresh rates. Request a rate and TrueHz verifies what the system actually applied, telling you the result either way.
• Extended measurement — run a longer test for the lowest, median and highest frame rate, worst jitter and sample count, all measured live across the run.
• Info & FAQ — plain-language answers about Hz, VRR, LTPO and why 90/120 Hz feels smoother.

HOW IT MEASURES (the part that matters)
The live rate uses Android's frame-timing callback (Choreographer). Supported modes, the active mode and the OS-reported rate come from the Display API. Seamless-switch and adaptive-refresh capabilities come from getAlternativeRefreshRates (Android 12+) and hasArrSupport (Android 16+). No device database, no model-name guessing, no value that defaults to "supported" on an error.

WHY THE MEASURED RATE CAN BE LOWER THAN THE ADVERTISED Hz
Because the number is real. The system lowers the rate to save power when little is moving, in power-save mode, when the device is warm, or when an app only draws slowly. Advertised Hz is the maximum the hardware can reach — not what is on screen every second.

WHO IT'S FOR
Anyone verifying a 60, 90, 120 or 144 Hz screen, an LTPO or adaptive-refresh panel — gamers, used-phone buyers, and reviewers who want the measured truth, not a spec sheet.

PRIVACY
The measurement features work fully offline and read nothing personal. Network access is only used for ads and the consent form. You can remove ads with a one-time purchase.

Works on Android 8.0+ and measures whatever your device exposes.