UptimeBot Free plan gives 2 free monitors per Slack team. So if you hit your monitors limit, you'll see the following message from UtimeBot offering you to upgrade the subscription right from the app by clicking the Buy More button.
We have flexible usage-based plans on offer including from 5 to 150 monitors.
Please, head up the link to upgrade directly from our website https://uptime.bot/upgrade/.
Do you hit a snag with UptimeBot?
Don't hesitate to contact us.