CarShake is free to download and free to use for the basics: scanning your car, timestamping photos, and storing condition records. The question isn't whether it's worth the cost (it's free)—it's whether you'll remember to use it.
A single false damage claim costs $200–$2,000 on average. CarShake prevents every false claim where you have a pre-scan. Even using it once can save you hundreds of dollars. If you valet park more than twice a year, CarShake pays for itself many times over.
The paid tier ($2.97/month or $29/year) adds unlimited cloud storage, automated before/after comparison, PDF report generation, and fleet management features. For most users, the free tier—with 10 scans stored locally—is sufficient.