Based on our record, Text Alerts seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
We also send mobile text messages when appropriate. Using https://mobile-text-alerts.com which is affordable and does the trick when phones and e-mail are down - usually during storms that knock out power. We did have to have everyone volunteer their number unless it was a company phone, but we had a pretty high sign-up rate. Source: over 2 years ago
We have been using https://mobile-text-alerts.com/ with good results (less than 200 users). Source: about 3 years ago
Notifuse - A 1-to-many notification API that's simple to use
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
YesWeHack - Global Bug Bounty & Vulnerability Management Platform
One Call Now - One Call Now's message notification delivers automated phone calls, SMS text messages and emails within moments to any group.
Bugcrowd - Harness the largest pool of curated and ranked security researchers to run the most efficient bug bounty and penetration tests