Day 100 vs Tabata & HIIT Interval Timer

One challenge. 100 days. That's it. Pick something simple — push-ups, a plank, a daily walk — or choose from over 40 bodyweight moves, and commit to it for 100 days. Day 100 gives you a 10×10 grid that fills as you go. Every check-in is a square. Every square is proof. TRACK WHAT MATTERS • The signature 100-day grid — your whole journey on one screen • Daily check-ins with streaks that actually mean something • Tap any past day to see what you did REMINDERS THAT LEARN Day 100 notices when you usually train and nudges you at the right moment — not at some arbitrary hour. Already checked in? No nag. Done is done. SHARE THE JOURNEY Every challenge gets a short day1.at link. Share Day 1. Share Day 50. Share the finish — or follow a friend's challenge and watch their grid fill up too. DAY 100 PRO • Run up to 3 challenges at once • Grace days — repair a missed day and keep your streak alive • AI training plans — a personal coach builds your next 100 days around your goals and fitness level • 40+ additional exercises across core, glutes, legs and cardio Pro is available monthly or yearly. The grid, daily check-ins, 6 free exercises, and one active challenge are free forever. Day 1 starts now. — Day 100 Pro is a monthly or yearly auto-renewing subscription. Payment is charged to your Apple ID at confirmation of purchase and renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings. Terms of Use: https://day100.co/terms Privacy Policy: https://day100.co/privacy

A dead simple interval timer. Open it, press play, train. Set your ready, work and rest times and the number of sets — that is the whole setup. A voice counts you in and calls every interval, so you never have to look at the screen while you train. WHAT PEOPLE USE IT FOR • HIIT and Tabata • Strength sets and weight circuits • Burpees, planks, mountain climbers, sprints • Stretching and mobility work • Anything that runs on a clock KEEPS GOING WHEN YOU LOOK AWAY Watch a video, change the music, lock your phone — the timer keeps counting and keeps talking. Glance at your Lock Screen to see how much is left. PLAYS WITH YOUR MUSIC Your music keeps going at its own volume. The announcements come over the top. FREE No account. No subscription. No full-screen ads. ABOUT TABATA Twenty seconds of work, ten seconds of rest, eight rounds, after a short warm-up. Devised by Professor Izumi Tabata at Ritsumeikan University, and used for squats, exercise bikes, running and much else. Maximum effort in each round is the point: a few minutes is said to do the work of far longer. Every duration is adjustable, so it does a great deal more than Tabata.