Is It Snappy? – Measure latency with your iPhone's 240 Hz camera
Measure input-to-output latency with your iPhone
Is It Snappy? – Measure latency with your iPhone's 240 Hz camera launched on April 3, 2017 with 293 votes, #66 of 3,007 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 9 years on.
In plain words
Is It Snappy? is an iPhone app that measures input-to-output latency—the delay between when you perform an action and when you see the result on screen. Using an iPhone's 240 Hz camera, it quantifies responsiveness in games, applications, and devices. The tool helps identify whether sluggish or laggy feelings are real or perceived by capturing and analyzing the actual time gap between user input and system output.
written from the facts on this page · September 2026
From the sources
Has a game, application, or device ever felt laggy to you? Have you ever witnessed an argument over which text editor was more responsive? The reason an interactive UI can feel sluggish or laggy is response latency - the time between an input and its corresponding output. The response latency of the real world is zero. When you pick up an object, your fingers and the object move in lockstep. In computers, there is often a subtle but observable delay between the action you take with your fingers and the resulting effect. Counterintuitively, as computers have gotten faster and more complex, these delays have lengthened. For example, if you get the opportunity, play with Windows 95 on old,…from isitsnappy.com
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