Continue 100 days
with DAY100.

DAY100 is a habit app for tracking small daily actions for 100 days.

Choose Normal, Hard, or Extreme Mode, then protect your habits with notifications, widgets, and app blocking.

Download for Free

3 Keys to Building Habits

Visualize 100 Days

Record daily wins in calendar and timeline views. Review past images and notes by date.

Choose 3 Difficulty Levels

Pick Normal, Hard, or Extreme Mode. Keep it light or make the challenge serious.

Never Forget with Alerts and Widgets

Recommended notifications and home screen widgets support your habit even when the app is closed.

DAY100 recommended notification settings screen

Three Modes for How You Continue

Choose reset rules that match the weight of each habit.

NORMAL

Normal Mode

The basic mode for stacking recorded days. Best when you want to build momentum without pressure.

HARD

Hard Mode

Miss two days in a row and reset to DAY0. Built for people who want real tension.

EXTREME

Extreme Mode

Miss even one day and reset to DAY0 the next day. The strictest mode for creating a reason to act today.

EXTREME MODE

Extreme Mode closes the exits.

In Extreme Mode, selected apps can be blocked until today’s habit is completed. Limit the apps you open automatically and make finishing today’s habit the first step.

Supports iOS Screen Time / Family Controls

Everything That Helps You Keep Going

Recommended Notifications

Notification times and messages are optimized for Normal, Hard, and Extreme Mode. Stricter modes push harder.

Home Screen Widgets

Check progress without opening the app. Pro unlocks weekly and monthly premium widgets.

Cloud Storage and Transfer

Images added to records can be stored in the cloud. Use a transfer code to move habits, notes, and images to a new device.

DAY100 Pro

Unlock 4+ habits, multiple Extreme Mode habits, and premium widgets for managing several goals at once.

FIND YOUR WAY

Find a guide

Choose a goal or obstacle to see how DAY100 can help you keep going.

100 DAY CHALLENGE

Start a 100-day challenge today.

Choose one action and record each daily win. DAY100 is an iPhone app built for turning a 100-day challenge into a lasting habit.

HABIT TRACKER FOR IPHONE

Track habits simply on your iPhone.

DAY100 is an iPhone habit tracker that brings daily records, review, reminders, and visible progress into one simple 100-day journey.

STOP THE THREE-DAY HABIT

Stop the three-day slump with a system.

Habits do not fail only because of weak willpower. Smaller actions, timely cues, and a record that makes restarting easy can keep you moving.

EXTREME MODE

Block apps until you are done.

Extreme Mode is DAY100’s strictest option: miss a day and return to DAY0, and optionally block selected apps until today’s habit is recorded.

HABIT WIDGET

Turn your Home Screen into a reminder.

A DAY100 widget keeps progress in sight so that opening your iPhone for something else can also remind you of today’s habit.

USE CASES

Study, train, and read in 100-day cycles.

The right goal and record depend on the habit. These examples show how to make study, exercise, reading, and healthy routines easier to continue.

Frequently Asked Questions

What kind of habit app is DAY100?

DAY100 is an iPhone habit app for tracking small daily actions for 100 days. You can review progress in a calendar and keep going with notifications, widgets, and app blocking.

Can I use DAY100 for free?

Yes. You can download DAY100 for free and use 100-day tracking and the basic features. DAY100 Pro unlocks 4+ habits, multiple Extreme Mode habits, premium widgets, and more.

What is the difference between Normal, Hard, and Extreme Mode?

Normal Mode stacks your recorded days. Hard Mode resets to DAY0 after two missed days in a row. Extreme Mode resets to DAY0 the next day if you miss even one day.

What can app blocking do in Extreme Mode?

In Extreme Mode, selected apps can be blocked until today’s habit is completed. It supports iOS Screen Time / Family Controls and helps you finish the habit first.

Can notifications and widgets help me avoid forgetting records?

Yes. Recommended notifications and home screen widgets help you keep going for 100 days even when the app is closed. Notifications are tuned to your selected mode.

Can I transfer habits, records, notes, and images to a new phone?

Yes. You can use a transfer code to move habits, records, notes, and images to your next device. Images added to records can also be stored in the cloud.

What can I review in the timeline?

The timeline lets you review past images and notes for each habit by date. You can switch between calendar and timeline views to look back on your 100-day record.

Your 5 minutes today will change your future.