Twitter Blue is Twitter's own subscription plan that offers exclusive features that free users can't use. Among these features are Undo Tweets, change icons, reading mode for threads, ad-free tweets, and a few more.
This plan is still not widely offered and is limited to a few selected countries only. At launch, the subscription price is $2.99 or if you're lucky on iOS the price in Malaysian currency will be displayed which is RM12.90
Recently, Twitter started raising the subscription price of this plan to $4.99 or RM22.90. In an email received by subscribers, the increase in subscription prices is said to help the Twitter team build features requested by users and ensure a better user experience and continue their mission of supporting journalism.
Loyal Twitter Blue users are said to be able to subscribe at the old price until October and will receive a 30-day notice before new charges apply. I've used paid Twitter services like Tweetbot and Twitter Blue, for me it's a bit worth it at that point. But with the price of RM22.90, I feel it is quite expensive.