The best alternatives to Flattr are Buy Me a Coffee, Blendle, and Patreon. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Flattr?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Buy Me a Coffee is a beautiful way for creators to accept one-time and monthly support from their fans. Without stitching together a bunch of apps like Patreon, Mailchimp, and a donate button — you can accept support, memberships, and build a direct relationship with your fans. Your fans are going to love it.
Patreon is popular among YouTube videographers, webcomic artists, writers, podcasters, musicians, adult content creators, and other categories of creators who post regularly online.
"tip me" is a very simple app that allow performers to monetize their activity and supporters to easily support them. Supporters can post message-style ads on performers' "tip me page" for ¥100 (≒ $1) per day.