The best alternatives to OGTester.com are TinyKiwi, OpenGrph, and Previewify. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of OGTester.com?
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TinyKiwi is a simple yet powerful image editor that helps you create beautiful designs. Easily design anything from eye-catching screenshots for social media and blog post covers to Open Graph images.
Your competitor isn't designing those images by hand. They're generating them via platforms like Previewify. They save more time and have a bigger conversion rate.
Opengraph image generator is a simple application that, using the online generator, generates attractive images for your og:image and twitter:image meta tags. OG Image generator makes it easy for you to make custom previews without the need for design skills.