I've been saying it over and over again recently - Timetastic is brilliant: really feel like the founders sat down and said "what is a real pain about managing leave/holidays etc. -- right, let's fix it. All of it". Timetastic absolutely nails all the issues with booking leave. I've never seen a more efficient system for leave: see who's out for the day, or the week, notifications to line managers and approval requests are all automatic, switch between week/month/year calendar views, see who's out in the team, list goes on and on. And the app is brilliant too. I honestly think Timetastic should be a "business" household name.