This tool transforms your iPhone into a traffic speed study device. Record passing vehicles, mark their positions frame by frame, and obtain precise speed estimates. Generate detailed reports for community advocacy and traffic calming initiatives.
1.0.2
August 15, 2026
1. Made the frame extraction experience better (Thanks for the feedback Christian!) 2. Added polish around back/edit to make the extraction flow easier (Thanks for the feedback Christian!) 3. #57/#38 Fix Google Play target API level requirements
MoreSlow Them Down uses your iPhone's camera to record passing vehicles. By calibrating with a known reference distance and marking a vehicle's position in two different video frames, the app calculates an accurate speed estimate in MPH.
The app's core functionality of recording video and calculating speed does not require an internet connection. However, features like sharing reports might require connectivity.
The app can generate detailed PDF reports that include V85 speeds, traffic volume breakdowns, speed distribution charts, and summaries of vehicle types. These reports can be filtered by street.
Yes, privacy is a key feature. Faces and license plates are automatically detected and blurred before any data is shared. Images and videos are not stored beyond the processing needed for speed calculation.
The app has an age rating of 12+, suggesting it is appropriate for users aged 12 and above. This is likely due to the nature of data analysis and reporting.
The latest version, 1.0.2, was released on August 15, 2026. While specific update frequency isn't detailed, this indicates recent development activity.
Slow Them Down is currently supported on iPhones. It is not available for iPads or Android devices at this time.
No, Slow Them Down does not contain advertisements. The app is free to download and use without any ad interruptions.
