Free

Details

  • Released
  • Updated
  • August 23, 2013
  • August 7, 2026

Features

Day 100 screenshot #1 for iPhone
Day 100 screenshot #2 for iPhone
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Day 100 screenshot #6 for iPhone
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About

Embark on a 100-day fitness journey with friends and colleagues. Track your progress and share achievements on social media. A fun way to stay motivated and compete.

100-day challenge tracking
Social competition with friends
Progress monitoring
Facebook sharing
Twitter sharing
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What's New in Day 100

1.0.6

August 7, 2026

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.

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User reviews

Did you even test it?!

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!

Horrible

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.
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Not user friendly

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....
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REALLY wanted this to work

Absolutely love the idea and really want this to work but it won't even let me enter a goal or anything. PLEASE fix

Boo

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.

Developer apps

FAQ

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.