
PagerDuty
8.3#1 in on-call scheduling softwareFrom $21 a monthFree planAndroidiOSWebAPI
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PagerDuty suits teams responsible for incident response, including developers, reliability engineers, customer success, and security teams. Its mobile app may be useful to responders who need incident context and schedule controls on iOS or Android.
You want what its maker publishes above — check its page for the details.