What are some alternatives?
When comparing Pixlr and Affinity Photo, you can also consider the following products
GIMP - GIMP is a multiplatform photo manipulation tool.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Sketch - Professional digital design for Mac.
Instagram - Instagram is a mobile, desktop, and Internet-based photo-sharing application and service that allows users to share pictures and videos either publicly, or privately to pre-approved followers.