Import Sheet is described as 'Free Google Sheets Add-on to sync, combine and integrate multiple spreadsheets. Import data from one spreadsheet into another. Install it for free' and is an app in the Office & Productivity category. There are six alternatives to Import Sheet for a variety of platforms, including Online / Web-based, Windows, SaaS, Google Drive - Sheets and Microsoft Office Excel. The best alternative is Screaming Frog SEO Spider. It's not free, so if you're looking for a free alternative, you could try SeoTools for Excel or Website Crawler. Other great apps like Import Sheet are CrawlCenter (Freemium), Blockspring (Paid) and SEOBLAZER (Paid).
SeoTools for Excel integrates popular services such as Moz, Google Analytics/Search Console, Majestic, and makes extraction of data and evaluation of links/domains/keywords super-fast and effective with the Excel formula-based environment.