Acorn offers Free Trial, but Polarr does not.
Polarr is designed for Large Enterprises, Medium Business and Small Business.
Acorn is designed for Individuals, Medium Business and Small Business.
Pricing for Polarr Starts at $2.49/Month when Billed Yearly whereas for Acorn Starts at $19.99One Time Payment.
Some top alternatives to Polarr includes Photopea, Pixo, PhotoEditor SDK, Adobe Photoshop Lightroom, Cutout.pro, Adobe Photoshop Lightroom Classic, Paintshop Pro, Home Photo Studio, Photo Editor Online, LuminarAI and Photoroom.
Some top alternatives to Acorn includes PicMonkey, Lunapic, piZap, Pixo, Piconion, Adobe Photoshop, Polarr, Cutout.pro, Paintshop Pro, Affinity Photo and GIMP.