Both paid users and free users can have integrations with Freshdesk, Freshservice, Slack, Webhooks, Twilio. 

• Freshdesk - The user-friendly ticketing platform, that helps in managing downtimes. 
•  Freshservice - Freshservice is intuitive, feature-rich IT helpdesk that helps in incident management.
• Slack - With slack integration have all your alerts in one place and assign it to the right people. 
• Twilio - Send alerts to your team anytime anywhere through SMS, Voice calls, Whatsapp message with Twilio Integration.
• Webhooks - looks for a specific update, or change in check status and, once it occurs, it automatically pushes the information you specify wherever you want through SMS, text messages and calls.