DownNotifier pricing

I want to decide whether DownNotifier (downnotifier.com) is the right tool and which plan to pick.
Below is what the StableMRR pricing directory read from DownNotifier's own pricing page (last checked 2026-10-30). It can be out of date, so treat it as a starting point.

Category: Developer tools / Monitoring and observability
What it does: Website uptime monitoring service that alerts users by email, SMS or WhatsApp when a site goes down.
Plans:
- FREE: Free. Limits: monitoring interval 10 minutes, websites 5. Includes: 10 minute monitoring interval, 5 websites, Email alerts, SMS alerts with credits
- PREMIUM: - ($14.95/mo billed yearly). Limits: monitoring interval 1 minute, websites included 10, extra websites $14.95 per 5. Includes: 1 minute monitoring interval, 10 websites included, Multiple contacts per monitor, SSL certificate monitoring, Extended reports
- PROFESSIONAL: - ($99/mo billed yearly). Limits: monitoring interval 20 seconds, websites included 25, SMS/WhatsApp credits 500 yearly, monitoring logs 7 days, extra websites $99 per 25. Includes: 20 seconds monitoring interval, 25 websites included, 500 yearly SMS/WhatsApp credits, 7 days full monitoring logs, WhatsApp notifications
Alternatives in the directory: AgentGov, ActivityProof, Adadot, Adversemonitor
Pricing page: https://www.downnotifier.com/plans
Directory listing: https://stablemrr.com/p/downnotifier-com

First ask me three short questions about my team size, budget and what I need it for. Then recommend one plan, tell me what could make it a bad fit, and compare it with the alternatives. Finish with what I should check on the vendor's site before I pay.