画世界Pro

Among its most notable features, in addition to running quite smoothly on older devices, it also includes over 100 brushes and a wide range of settings for them; you can even import Photoshop brushes in ABR format.

It also offers various filters that, unlike other apps, are completely free, such as gradient maps and tone curves, among others.

Please check this link for more information of the app.

/!\IMPORTANT/!\

It’s important to note that the app is entirely in Chinese; the entire interface and all tools are in Chinese, and there are no language settings—not even English.

For that reason, I’m creating some tutorials and lists with translations for every button, option, and tool. Keep in mind, though, that I don’t have any help, so it might not be as quick as I would wish.