Standard push notifications are not enough for critical incidents. Alerio is a Critical Alert System designed to wake you up when your servers go down. Key Differentiators: VoIP Calls: Critical alerts come in as full-screen phone calls. Multi-Channel Support: Backup alerts via Telegram, WhatsApp, Email, Slack, and Discord. Generous Free Tier: Built for self-hosters and indie devs who find enterprise solutions too expensive and complex.