DeltaDoc is described as 'leading online documents comparator tool. It is the fastest way to spot differences between PDF, Word, PowerPoint and more documents' and is an website in the Office & Productivity category. There are four alternatives to DeltaDoc, not only websites but also apps for Windows, Mac and SaaS. The best alternative is Adobe Acrobat DC. It's not free, so if you're looking for a free alternative, you could try Smallpdf or CleverPDF.