Day 100
Health & Fitness
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
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
Day 100 Pro is here. Subscribe to run up to 3 challenges at once, use grace days to protect a streak, and restart any challenge from today.
Also in this update:
• Sharing right after a check-in now works reliably
• Fixed a rare "couldn't save" error when checking in
• Smoothed out the first-run screen
Thanks for building the habit with us.
The developer, Little Polar Apps Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Little Polar Apps Ltd
- Size
- 53.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.6 or later.
- iPhone
Requires iOS 15.6 or later. - iPod touch
Requires iOS 15.6 or later. - Mac
Requires macOS 12.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contests
Contains
User-Generated Content
Health or Wellness Topics
Social Media
- In-App Purchases
Yes
- Day 100 Pro — Yearly $29.99
- Day 100 Pro — Monthly $3.99
- Copyright
- © Little Polar Apps Ltd
