Polotno Studio is described as 'Free online design editor. Create images for social media, YouTube previews, Facebook covers' and is an app in the Photos & Graphics category. There are more than 50 alternatives to Polotno Studio for a variety of platforms, including Online / Web-based, Windows, Mac, SaaS and Linux. The best alternative is Inkscape, which is both free and Open Source. Other great apps like Polotno Studio are Canva (Freemium), Adobe InDesign (Paid), Vectr (Free) and Adobe Fireworks (Paid).
Venngage is an easy to use Infographic Maker and lets you make beautiful Infographic Designs & Themes for free! Choose from hundreds of professional templates for infographics, reports, posters... Download as an image or PDF.
Adobe Spark for web and mobile makes it easy to create social graphics, web pages, and short videos. With Spark, available as a standalone subscription or as part of an Adobe Creative Cloud plan, you get full access to premium templates and Adobe Fonts.