No time limit
A 30-day trial is not free software. Look for a free tier that never expires.

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Free · SurveillanceWatch, record and get alerts from your IP cameras on a PC you already own — with plate recognition built in, free on one camera.
Free LPR software · one camera free for life · plate recognition included · about 100 MB
You do not need a recorder box or a monthly cloud plan to protect a home or a small business. Free video surveillance software turns a Windows PC into the recorder.
VISEC does it with plate recognition built in — and its free license covers one camera for life.

A 30-day trial is not free software. Look for a free tier that never expires.
ONVIF support means it works with most IP cameras, whatever the brand.
Footage on your own drive: private, and nothing to pay each month.
Motion zones and email snapshots, so you know without watching.
Add cameras later without switching software — ideally for a one-time price.
Plate recognition and gate control turn cameras from recorders into tools.

It depends on your cameras and needs. If you want motion alerts and plate recognition with no time limit, VISEC is free for life on one camera. For more cameras, paid licenses are a one-time purchase.
Yes. Most IP cameras support ONVIF, and VISEC works with 99% of ONVIF cameras including Hikvision, Dahua, Reolink, Amcrest and Axis.
No. The PC does the NVR's job: it records the cameras to its own drive.
Not with VISEC. Recordings are stored on your own PC.