The service is very convenient and useful, its main advantage is that it shows the level of competition for various queries. To get your site on the first page of Yandex and attract many visitors, it's important to choose keywords with a competition level of up to 10. The more of these low-competition keywords you use, the better your chances of making it to the top. 100 checks cost 30 rubles. You can top up your account via WebMoney, Yandex Wallet, or bank card. There are also 20 free checks available for testing the service. Overall, I highly recommend giving it a try; it’s truly a helpful tool.