Is there a free Campnab alternative?

Hipcamp offers free campground availability alerts powered by Campflare! We look out for availability at national and state park campgrounds and alert you within seconds of spots opening up—for free, for everyone, forever. This service works very similarly to other paid services you may have used before. In fact, Campflare scans the most sought-after campgrounds as often as every 15 seconds (up to 200x more frequently than other paid services) to give you the absolute best chance of reserving any newly available campsite. Set up an alert.