Apps similar to InerziaTimer include Hourglass, which is free and open source. Other options are MinuteTick, SnapTimer, Free Countdown Timer and wnr. Countdown Timers like InerziaTimer are a crowded field, with more than 50 alternatives for Mac, Windows, iPhone, iPad and Android.
TTclock is a simple, compact alarm clock, countdown timer and stopwatch that can be minimized to the system tray. It has two display modes: pure clock and control panel.
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CookTimer is a simple cross-platform countdown timer that helps when cooking, making tea or eggs. It also works for any other timing purpose such as working out. it was developed using wxWidgets and was tested on Windows and Linux.
Android stopwatch app in the Material You theme, designed for ease of use and best features
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TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock, alarm clock, tray clock, stopwatch, timer, sticker, auction watch, work days/hours countdown clock and time synchronization utility. TimeLeft uses Winamp skins to show digits and text.
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Free Stopwatch is a free, full-featured and accurate flexible digital stopwatch software for Windows 10 and Windows 7.
Canada
Smart Countdown Timer allows you to use natural language to set, modify and start a countdown on your Mac.
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MemoryTimer is a countdown calendar reminder app that keeps track of Birthdays, Weddings, Anniversaries, Graduations, Holidays, Vacations and Trips, and other exciting events that are happening around you! With MemoryTimer, you will never miss your important events and dates!
Timer is a simple chronometer application. Enter a value and click Start to count down any number of hours, minutes, and seconds, or start at zero to track elapsed time. Available for Macintosh and Microsoft Windows computers.
XNote Stopwatch is a versatile and flexible multifunctional digital stopwatch / countdown timer / clock software for PC. Helpful for timekeepers at sport competitions, time tracking of work, or even as a metronome.
United States
Mini Stopwatch is a minimalist stopwatch app designed for simplicity and efficiency. It sits conveniently in your macOS menu bar, providing quick access with just a click. Start and stop the timer with a single click, and reset it with a double-click.
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