ZoneMinder vs iSpy vs Blue Iris | Setup | Comparison

The three most popular security camera DIY NVRs are ZoneMinder, iSpy, and Blue Iris. Blue Iris is the gold standard but it requires Windows and cost $70. Could I get away with "totally free" with ZoneMinder? Maybe use Windows but otherwise go free with iSpy? Or is Blue Iris worth the money?

All must be:
1. Able to detect intruders in a specified zone
2. Remotely viewable via a mobile app
3. Able to push an alert to my phone

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** RELATED **
Lorex LNB4421 PoE IP Security Cameras : https://granworks.com/amazon/lorex-ln...
TP-Link TL-SG1008P PoE Switch : https://granworks.com/amazon/tplink-p...
Blue Iris: http://blueirissoftware.com
ZoneMinder: https://zoneminder.com
iSpy: https://www.ispyconnect.com/

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