Microsoft Lens is described as 'Trims, enhances, and straightens scanned documents or whiteboards, exports to PDF, Word, or PowerPoint, supports text extraction, and saves to cloud storage' and is a Image Scanner in the photos & graphics category. There are more than 50 alternatives to Microsoft Lens for a variety of platforms, including Android, iPhone, iPad, Windows and Android Tablet apps. The best Microsoft Lens alternative is FairScan, which is both free and Open Source. Other great apps like Microsoft Lens are Pocket Scanner, OSS Document Scanner, Google Lens and Snagit.
Office Lens is adapted to many platforms, but if I talk about iOS, I choose Pocket Scanner.