LiDAR Vision and Ranging vs PoolCheck

This app utilizes the iPhone or iPad rear-facing LiDAR to generate a user-adjustable depth field (color gradient), along with a numerical distance value to the center of the field accurate up to 5 meters. Useful for measuring short distances without a tape measure and for navigating small spaces in the dark. NOTE: LiDAR hardware is only present on iPhone 12 Pro or later models, and iPad Pro 2020 or later models.

PoolCheck is a free pool test strip reader and pool chemical dose calculator for backyard pool and spa owners. Photograph your test strip, confirm the readings, and get a clear dose plan: which products to add, how much, and in what order. No account and no sign-up. The app opens straight to your pool. READ YOUR TEST STRIP • Take a photo of your strip with your iPhone or iPad camera, or pick one from your photo library. PoolCheck lines up each pad with the color chart and suggests a reading for you. • Color matching runs on your phone. Your strip photos are not uploaded. • Each suggestion is marked so you can check it against the chart on the bottle. Low-confidence pads are flagged or left blank rather than guessed. • Prefer a drop kit? Type your numbers in by hand. EVERY READING THAT MATTERS • Free chlorine (FC) and total chlorine (TC) • pH • Total alkalinity (TA) • Calcium hardness (CH) • Cyanuric acid (CYA / stabilizer) • Bromine for bromine pools and spas A POOL DOSE CALCULATOR THAT SHOWS ITS WORK • A step-by-step plan for your gallons: product, amount, and an everyday measure such as "about 1½ 5 lb bags". • Adds are listed in a safe order: alkalinity, then pH, then sanitizer or shock, then stabilizer, then hardness. • Retest timing for each step, and a confirm screen so you check every number before you pour. • Your free chlorine target is set from your CYA level, not a one-size 1–3 ppm range. • Combined chlorine (TC − FC) is calculated, and PoolCheck suggests a shock toward breakpoint when it is 0.5 ppm or higher. • At-a-glance status for pH, alkalinity, hardness, chlorine and CYA, each marked low, high or OK. BUILT FOR YOUR POOL • Chlorine, saltwater (chlorine generator), bromine and spa. • Vinyl, plaster and fiberglass finishes. • Know your gallons? Type them in. Don't? The pool volume calculator estimates gallons from shape (rectangle, oval, round or kidney), length, width and average depth. • Pick the chemical brand on your shelf. Doses use popular pool-chemical brands or generic store products. • Optional shop links help you find a product online. HISTORY, WEATHER AND HELP • Every completed test is saved with the date on your device. Tap one to reopen it, or swipe to delete it. • Add your ZIP code for a short local forecast and a heads-up to retest after heavy rain. • A built-in Help & FAQ explains strip reading, CYA and chlorine, combined chlorine, and pool volume. • Send feedback straight from the app. PRIVATE BY DESIGN • No account, no password and no cloud profile. Settings, history and purchases stay on your device. • Strip photos are read on your phone and never uploaded. FREE, WITH AN OPTIONAL UPGRADE PoolCheck is free to download and use, and supported by ads on the results screen. A one-time $4.99 in-app purchase removes ads. It is not a subscription. Already bought it? Your purchase is restored automatically from the App Store on this device. WHO IT'S FOR Homeowners who test their own pool or hot tub with strips or a drop kit and want a quick, clear answer to "what do I add?" It's also a handy second check for anyone who looks after a pool. IMPORTANT PoolCheck is a reading and planning aid. Test strips are approximate, so confirm big changes with a drop test kit or your pool store. Add one chemical at a time, never mix chemicals, and always follow the product label. As an Amazon Associate, PoolCheck earns from qualifying purchases made through shop links. Questions or ideas? Use Send feedback in the app. We read every message.