stts is described as 'helps you monitor the status of various cloud services' and is an app in the Development category. There are three alternatives to stts for Online / Web-based and SaaS. The best alternative is Bearer, which is free. Other great apps like stts are Checkly (Paid) and ApiChecker (Paid).
Bearer is a developer tool that helps engineering teams monitor API requests, track performance, detect anomalies, and fix issues for their critical API usage. The solution monitors all outgoing API requests without proxying traffic.
Checkly provides a better way to monitor your API endpoints and browser click flows from a single, simple dashboard. Checkly's deep but easy to use API monitoring solution to check your mobile, webapp or IOT API for performance, uptime and correctness.