The best alternatives to Rowlab are Mobbin, UI Sources, and UI Patterns. If these 3 options don't work for you, we've listed a few more alternatives below.
Mobbin is the Pinterest for UI & UX design. We are building a comprehensive, expert-curated library of interfaces from the best-in-class digital products that helps product designers find relevant design inspiration and references with significantly less time and effort.
Chamjo is a library that provides you more than 500+ screenshots or patterns of Asia-based apps with search and filter capabilities. It allows you to discover and be inspired by this enormous collection of patterns.