The best alternatives to Calibre are Instabug, Simple Ops, and Ambition. If these 3 options don't work for you, we've listed a few more alternatives below.
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Instabug empowers mobile teams test new features, improve app quality, and collect actionable feedback from users across the entire mobile development lifecycle
Performance monitoring simplified by making uptime monitoring, performance and real user metric tracking along with Global uptimes and SSL information in an easy and simple way. Never let users see your website down or with bad loading speeds. Receive alerts & insights in real-time on health and performance.
Obzrv.it is a web monitoring service. Our solution monitors web pages and alerts subscribers when given page or specific page's element changes. Monitor products prices, job offers, legal documents... everything that is important to you