Streak

A user's streak is a measure of how consistently they use Duolingo.^[1] A streak starts at zero and increases by one for the first lesson done each day by the user. It resets to zero if the user does not complete a lesson unless a streak freeze is bought in advance.^[2]

Extending a streak[]

To extend your streak for a given day, you must complete a lesson before midnight (00:00/12:00 AM).^[3]

If you are using a Duolingo app in offline mode, you need to go online before the midnight deadline to ensure your activity counts for that day.^[4]

Perfect Weeks[]

If you extend your streak every day of the week without missing a day (or using any streak freezes), you get a Perfect Week, changing the appearance of the streak flame to yellow and adding an orange bar for that week in the streak calendar. If you miss a day, the streak icon will revert to orange and you will lose your Perfect Week.

Friend Streaks[]

On mobile only, you can start a friend streak with up to five friends. When you invite a person, they have to accept it to start the friend streak. This is optional and not required to use Duolingo.

It increases by 1 when you and the other person extend their streak that day.

If you have extended your streak but the other person(s) didn't, you can nudge them by sending them a reminder.

When a friend streak is broken, the person is removed from the list. To start a friend streak with that person again, you have to unfollow then follow them again.

Streak rewards[]

You can purchase a "Double or Nothing" wager in the shop which will reward you for maintaining your streak for seven days.^[5] Note that some users are further challenged to 14 and 30 days, which double the reward every time.
Reaching certain milestones (such as 100 day streak) can earn the user 3 days free of Super Duolingo. If, however, you use the web browser version instead of the app to extend your streak, you will not get the 3 free days of Super Duolingo.
The Streak Society, claimed as the most exclusive club in Duolingo, is unlocked once a user maintained a 7 day streak. Further rewards are unlocked at 30, 100 and 365 days.

Trivia[]

The Streak icon was redrawn during 2019.
The price of the Streak Freeze was increased in iOS.

Notes[]

Using the Duolingo widget (mobile only) shows your streak on your home screen, along with an image.

You can freeze your streak to avoid it resetting from a day of inactivity by buying a streak freeze in the gems store.
If you lose your streak, you will have 3 days to complete a special set of lessons to restore it.
If you encounter any technical problems with your streak(s), you can report them in the Troubleshooting discussion section or by using the “Support” tab on the left edge of the Duolingo website.
The Streak Hall of Fame is maintained by the Duome website.
The time zone Duolingo judges your streak by is initially set to the time zone you were in when you created your account. It's impossible to change this time zone using the website, but you can change the device time,^[6] so if you only use the website, and you move to a different time zone, your “streak midnight” might not match your local midnight. Doing activity on one of the mobile apps, however, will automatically update your streak time zone to your device's current one.^[7]
Some timezones are processed incorrectly. To check your timezone, open your profile's page, look into source code (CTRL+U in Chrome, Chromium-based browsers and Firefox) and search for “timezone” and “timezone_offset”. Then, find your timezone at list of timezones and check if the offset there matches your “timezone_offset”. If it does not, some parts of your day may be attributed to a day before or after.
References