The best alternatives to Screen Guru are Screely, Glorious Demo, and Josh Parnham. If these 3 options don't work for you, we've listed a few more alternatives below.
The Screely extension lets you instantly create a screenshot of the current webpage and opens it in Screely Screely is an online tool that instantly turns your screenshots and designs into beautiful design mockups. The extension helps you skip the manual uploading of files and saves you time and frustration.
Glorious Demo is an open source javascript library that exposes an easy API to create animations for your code samples. Projects like https://nodecron.com/ are already using it.
iloveShot, is a free and easy-to-use online tool platform that offers you to take high-resolution and perfectly captured pictures of different websites available on the internet.
ImmortalSV let's you take a snapshot of a website and upload it to the Bitcoin (BSV) blockchain, forever. It's useful for archiving websites and news. It requires a moneybutton.com account, but after that only takes two clicks.