Twitter launches $3 monthly subscription service called Twitter Blue that allows users to undo tweets

• Twitter just launched a subscription service, Twitter Blue, that will cost $2.99 a month.
• It comes with an "undo tweet" button, color themes, and a "reader mode" for threads.

Twitter on Thursday launched a new subscription service called Twitter Blue. It costs $2.99 a month and lets you customize colors in the app, "undo send" on your tweets, and organize tweets in folders so they're easy to find later on.

Under the In-App Purchases section on the iOS App Store, Twitter Blue is listed with a price of $2.99, or £2.49. Twitter launched the service for users on June 3.

Twitter said in a release the subscription service came with an "undo" button, which gives you up to 30 seconds to stop a tweet from sending. The user taps the undo option to go back to the Tweet draft and make changes.

Twitter clarified the Undo Tweet feature is not an edit button, and users would not have an option to revise tweets after the "undo period" is over.

"Once the Undo period is over, the Tweet is viewable to the public and you can either leave it or delete it, just as you normally would on Twitter," the company said in a release. "Tweets that are already viewable to the public can't be edited."

Technology blogger Jane Manchun Wong, who had prior access to Twitter Blue, tweeted in March that the subscription service allowed users to customize colors and app icons.

According to screenshots of Twitter Blue, which Wong tweeted, Twitter Blue also has a "Reader Mode" feature meant to help users "keep up with threads by turning them into easy-to-read text."

Twitter Blue also has a "Collections" tab where users can save and organize tweets in folders so they are easier to find later, according to Wong's screenshots.

Earlier this month, the social-media giant began letting users send and receive money through a "Tip Jar."