# Is It Snappy? > Measures device input-to-output latency using high-frame-rate video analysis. (iPhone/iPad app by Chad Austin.) - Source: https://appshunter.io/ios/app/is-it-snappy/id1219667593 (this page in markdown: same URL + `.md`) - Developer: [Chad Austin](https://appshunter.io/developer/1206056095) - Category: Utilities, Productivity - Price: Free - Rating: 4.90/5 from 28 App Store ratings · 23 written reviews indexed - Age rating: 4+ - Requires: iOS 15.6 · 3 MB - Languages: American English - Released: 2017-03-28 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/is-it-snappy/id1219667593/reviews.md ## What is Is It Snappy?? Use your iPhone's high-frame-rate camera to measure the input-to-output latency of your text editor, device, game console, or television. Simply record a video containing the button press and the resulting effect on the screen. Is It Snappy? provides a frame-accurate scrubbing UI where the precise input and output times can be marked. The difference in milliseconds is displayed. With Is It Snappy?, the responsiveness of a device, text editor, display, or video game can be objectively quantified. ## Key features - Measure input-to-output latency - High-frame-rate camera recording - Frame-accurate scrubbing UI - Precise input and output time marking - Objective responsiveness quantification ## Recent user reviews (10 of 23) All indexed reviews: https://appshunter.io/ios/app/is-it-snappy/id1219667593/reviews.md ### 5/5 — iOS 18 crash resolved, back to being a great tool *2025-01-29, version 1.0.6* A simple and amazing tool to learn about displays and software settings affecting latency. ### 5/5 — 15 Pro compatibility? *2024-12-07, version 1.0.5* it stops immediately after the shot. is this only for me? ### 1/5 — No longer works with iOS 18 *2024-12-03* On updating to iOS 18, the app now crashes when trying to load a clip. A huge shame, this was a tool I was obsessively using to massively speed up my gaming latency tinkering. ### 5/5 — Simple and genius *2022-12-28, version 1.0.5* I love this! Was easily able to measure the input lag of my TV by having it mirror my laptop and switching from one browser tab to another. The first time I ran it, it asked for photo access, which was weird. I allowed access to 0 “selected photos”, and it worked fine. (Actually it crashed the first time I clicked the camera icon, but after restarting it, it worked fine) ### 1/5 — Love the idea but literally won’t start *2021-02-24, version 1.0.5* Excited to try this out but the app won’t even start. It crashes immediately. I selected to grant access only to a select few photos, instead of all—maybe that’s the problem? Pretty fundamental issue, if so. Hope to be able to try this soon and wish the author good luck with this vague bug report ### 5/5 — Very simple app for measuring input lag which jus works! *2021-02-21, version 1.0.5* This is fantastic app. Wanted to test input lags from different applications and it works very well. The app is very easy to use and it’s the best way to turn your old 4 year old iPhone into legit testing tool. Kudos to the author! ### 3/5 — Functional *2020-12-04, version 1.0.5* Works fine, but needs full photo and camera permissions to even work (and crashes when only permitted to view selected photos and the selection is empty). Would be great if it worked without access to the whole photo album. ### 3/5 — Needs to be fixed - doesn't allow 240fps increments anymore *2020-09-26, version 1.0.4* Would be 5 stars but since the last update it has been bugged. The app is supposed to record at 240fps so that you can have precision down to 4ms. It does record at 240fps, however, when trying to set the start/end it moves increments of 4 frames - making it only as accurate to 60fps, which makes it pretty poor as a measurement system. ### 5/5 — Love this app *2020-04-12, version 1.0.4* It does one thing and it does it well ### 5/5 — useful tool *2020-03-23, version 1.0.4* would be noce to have buttons to go back and forth between frames, for precision, in addition to the gesture ## Frequently asked questions about Is It Snappy? ### What does Is It Snappy? do? Is It Snappy? allows you to measure the input-to-output latency of various devices like text editors, game consoles, and televisions. It uses your iPhone's high-frame-rate camera to record a button press and its resulting on-screen effect. ### How does Is It Snappy? measure latency? The app provides a frame-accurate scrubbing interface. You can precisely mark the exact moment of the button press (input) and the moment the effect appears on screen (output) in the recorded video. The difference between these two points is then calculated in milliseconds. ### Is Is It Snappy? free to use? Yes, Is It Snappy? is a free application. It does not have any in-app purchases or advertisements, making it completely free to download and use for all its features. ### What devices can I test with Is It Snappy? You can use Is It Snappy? to test the responsiveness of a wide range of devices, including text editors, game consoles, televisions, and any other display or input system where you want to quantify lag. ### What are the benefits of using Is It Snappy? This app allows for objective quantification of responsiveness. Instead of relying on subjective feelings, you can get precise millisecond measurements of how quickly your devices react to input, which is useful for gamers, content creators, or anyone concerned with performance. ## Version history (last 5 releases) ### 1.0.6 — 2025-01-07 - Fixed crash on iOS 18 - Increased minimum iOS version to 15 - Updated website links - Updated copyright ### 1.0.5 — 2020-11-24 - Dark Mode support - Fixed frame selection on HEVC videos - Made capture and mark screens fullscreen ### 1.0.4 — 2017-10-17 - Doubles the width of the tap region at the edge of the screen for advancing by one frame. - Internal changes for future compatibility. ### 1.0.2 — 2017-10-16 - Doubles the width of the tap region at the edge of the screen for advancing by one frame. ### 1.0.1 — 2017-04-05 - Fix crash when deleting captures on an iPad ## Apps similar to Is It Snappy? | App | Rating | Price | Category | | --- | --- | --- | --- | | [FightNote - App to win](https://appshunter.io/ios/app/fightnote-app-to-win/id1523154931) | 4.8 (4) | Free | Utilities | | [StopTheScript](https://appshunter.io/ios/app/stopthescript/id1588394487) | 4.6 (25) | $5.99 | Utilities | | [RetroAchievementsUI](https://appshunter.io/ios/app/retroachievementsui/id6504225426) | 4.7 (3) | Free | Utilities | | [PineTool](https://appshunter.io/ios/app/pinetool/id6448319330) | 5.0 (11) | Free | Utilities | | [Imgpls](https://appshunter.io/ios/app/imgpls/id6639617400) | 4.5 (8) | Free | Utilities | | [Wizzo Remote](https://appshunter.io/ios/app/wizzo-remote/id6462999902) | 4.7 (12) | Free | Utilities | ## More apps by Chad Austin - [PassDrop 2](https://appshunter.io/ios/app/passdrop-2/id1206056096) All apps by Chad Austin: https://appshunter.io/developer/1206056095 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*