# Day 100 > 100-day fitness challenge app for social motivation and progress tracking. (iPhone/iPad app by Little Polar Apps Ltd.) - Source: https://appshunter.io/ios/app/day-100/id622398480 (this page in markdown: same URL + `.md`) - Developer: [Little Polar Apps Ltd](https://appshunter.io/developer/385080757) - Category: Health & Fitness, Lifestyle - Price: Free - Rating: 1.00/5 from 5 App Store ratings · 5 written reviews indexed - Age rating: 12+ - Requires: iOS 15.6 · 55 MB - Languages: American English - Released: 2013-08-23 - Data updated: 2026-08-12 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/day-100/id622398480/reviews.md ## What is Day 100? One challenge. 100 days. That's the whole idea. Day 100 is built around a single, powerful commitment: pick one challenge and show up for it every day for 100 days. No endless workout libraries, no guilt, no clutter — just one thing, done daily, until it's a habit. PICK YOUR CHALLENGE Choose something simple and repeatable — push-ups, a plank, a daily walk, sit-ups, or your own custom challenge. Day 100 sets a starting target that fits your level and eases it upward over the 100 days, so Day 1 feels doable and Day 100 feels earned. THE 100-DAY GRID Your whole journey lives on one screen: a 10×10 grid where every day is a square. Hit today's target and the square fills in. Miss a day and you'll see it. It's the simplest, most honest picture of consistency there is — and watching it fill becomes its own motivation. Tap any past day to see exactly what you did. CHECK IN DAILY Each day takes seconds. Open the app, see today's target, log what you actually did, and mark it complete. Your streak grows with every check-in, and once you've shown up, you're done — no nagging for the rest of the day. STREAKS THAT MEAN SOMETHING A streak here isn't a vanity number. It's the through-line of your 100 days — the run you're protecting, the reason to show up on the days you'd rather not. REMINDERS THAT LEARN Set a daily reminder, or let Day 100 learn from when you actually check in and nudge you at the right moment. Already done for the day? No reminder — because done is done. SHARE THE MILESTONES Every challenge gets its own short link. Share Day 1 when you start, Day 50 when you're halfway, and Day 100 when you finish — and bring people along for the ride. DAY 100 PRO Go further with a subscription: • Up to 3 challenges at once — stack push-ups, a plank, and a walk • Grace days — repair a missed day and keep a hard-won streak alive • Restart any challenge — wipe the slate and make today Day 1 again • AI training plans (coming soon) — a day-by-day plan built around your level, goals, and schedule FREE TO START The heart of Day 100 is free: one active challenge, the full 100-day grid, daily check-ins, streaks, and sharing. Upgrade to Pro whenever you want more. Pick one thing. Give it 100 days. See what you build. — 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 ## Key features - 100-day challenge tracking - Social competition with friends - Progress monitoring - Facebook sharing - Twitter sharing ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/day-100/id622398480/reviews.md ### 1/5 — Did you even test it?! *2015-11-21* Good idea. Super poor execution! I was able to log in but unable to enter in a goal. It can't be loading so long for 10 minutes. Check your code and TEST it! ### 1/5 — Horrible *2014-12-17* I hate this app. It constantly tells me that I already entered activity for a day I know full well that I didn't. Then it shows that I'm behind schedule on my challenges, but if I try to enter previous day activities it says that I've already completed that day. It can't be both ways! Maybe if there was a calendar where I could see what days were marked I would know what days it thinks I haven't done. Very frustrating. ### 1/5 — Not user friendly *2014-08-13* I was excited to find a 100 day challenge app that didn't have some motivation guru talking at you everyday. But this app needs work. The interface is difficult to navigate, and doesn't explain what you're doing at all. Not able to set goals or see how you've done in past. It needs a calendar view. Disappointed I lost $1 on this.... ### 1/5 — REALLY wanted this to work *2014-07-31* Absolutely love the idea and really want this to work but it won't even let me enter a goal or anything. PLEASE fix ### 1/5 — Boo *2014-05-09* Great concept, simple design.. Too bad it won't work. I was able to enter a goal, but it won't let me mark it as done, or check of a previous day. Keeps freezing and giving me error codes, and not letting me navigate back to home. Bummed. ## Frequently asked questions about Day 100 ### What is Day 100? Day 100 is a health and fitness application designed to help users complete a 100-day challenge. It allows for social competition with friends and colleagues, and enables progress sharing. ### What kind of challenges can I track with Day 100? The app is specifically designed for 100-day fitness challenges. Users can monitor their progress throughout this period to stay motivated and achieve their goals. ### Can I compete with my friends using Day 100? Yes, Day 100 is built for social competition. You can engage in challenges with your friends and colleagues, fostering a sense of camaraderie and mutual motivation. ### How can I share my progress from Day 100? Day 100 allows you to share your progress directly via popular social media platforms. You can post updates on Facebook and Twitter to keep your network informed of your achievements. ### What devices is Day 100 available on? Day 100 is a mobile application. While specific device compatibility isn't detailed, it is generally available on smartphones and tablets. ### How often is Day 100 updated? The latest version of Day 100 is 1.0.5, which was released on April 18, 2014. This indicates infrequent updates in recent years. ### What is the user rating for Day 100? Day 100 has a very low user rating of 1.0 stars based on only 5 ratings. This suggests a significant dissatisfaction among its current user base. ### Is Day 100 free to use? Yes, Day 100 is available for free. There are no costs associated with downloading or using the core features of the application. ## Version history (last 5 releases) ### 1.0.6 — 2026-08-07 Day 100, rebuilt from the ground up. We've re-engineered the entire app on new technology—faster, smoother, and more reliable end to end—and redesigned it around the thing that matters most: your 100 days. What's inside: • A 100 day 10×10 grid—your whole journey on one screen • Quick daily check-ins and streaks that actually mean something • Reminders that learn when you train and nudge you at the right moment • Share your milestones with a tap • Day 100 Pro—up to 3 challenges, grace days, restart any challenge, and AI plans coming soon Same idea: one challenge, 100 days. A whole new app to see it through. Thanks for being here. ### 1.0.5 — 2014-04-18 Fixed previous day completion. ### 1.0.4 — 2014-03-18 Bug fixes ### 0.4 — 2013-12-18 Bug fixes ### 0.3 — 2013-10-27 Bug fixes ## More apps by Little Polar Apps Ltd - [Heritage App](https://appshunter.io/ios/app/heritage-app/id385080754) All apps by Little Polar Apps Ltd: https://appshunter.io/developer/385080757 --- *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 2026-08-12.*