I really like this service for monitoring search positions. It's convenient to send information to clients, either through a link or by exporting data to a spreadsheet. When using a guest link, no registration or software installation is required. There's the option to group queries, export specific phrases to tables, compare different time periods, and track which positions are losing their rankings. Topvisor will indicate if a link turns out to be irrelevant. The only downside is that if there are too many queries, the cost of tracking positions can be high.