# Slow Them Down — Your road has a speed problem

> iPhone app for measuring traffic speed and generating advocacy reports. (iPhone/iPad app by Duncan Grazier.)

- Source: https://appshunter.io/ios/app/slow-them-down/id6760197118 (this page in markdown: same URL + `.md`)
- Developer: [Duncan Grazier](https://appshunter.io/developer/1883130848)
- Category: Utilities, Lifestyle
- Price: Free
- Rating: 3.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 12+
- Requires: iOS 17.0 · 4 MB
- Languages: American English, Mexican Spanish
- Released: 2026-03-27
- Data updated: 2026-08-31
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/slow-them-down/id6760197118/reviews.md

## What is Slow Them Down?

Slow Them Down turns your iPhone into a traffic speed study tool. Record vehicles on your street, mark their positions frame by frame, and get accurate speed estimates — no radar gun required.

How it works
1. Calibrate your camera using a known reference distance (vehicle length, lane width, or a manual measurement)
2. Record a video of passing traffic
3. Select two frames and mark the vehicle's position in each
4. Get an instant speed estimate in MPH

Track every vehicle
Log each measurement with vehicle type, travel direction, street name, and timestamp. Build a complete picture of traffic patterns in your neighborhood over days, weeks, or months.

Automated reports
Generate detailed PDF reports with V85 speeds, traffic volume breakdowns, speed distribution charts, and vehicle type summaries. Filter by street to isolate problem areas. Share reports directly with your city council, HOA, or neighborhood group.

Privacy built in
Faces and license plates are automatically detected and blurred before you share anything. The app errs on the side of caution because a blurred street sign is better than a visible plate. We also don't store the images, videos beyond the processing needed to calculate a speed.

Built for advocacy
Speed data is what cities use to justify traffic calming measures like speed bumps, stop signs, and road diets. Slow Them Down gives your community the same data, collected from the streets you actually live on.

## Key features

- Record passing traffic videos
- Frame-by-frame vehicle position marking
- Accurate speed estimation (MPH)
- Log vehicle type, direction, and timestamp
- Generate PDF traffic reports
- Automatic face and license plate blurring
- Data for traffic calming advocacy

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/slow-them-down/id6760197118/reviews.md

### 5/5 — Great App + Responsive Dev

*2026-08-15*

This app is exactly what I was looking for to get some data on nearby street. 
I had some issues using it and emailed the dev. He pushed an updated within 48 hours fixing the issues!

## Frequently asked questions about Slow Them Down

### How does Slow Them Down measure speed?

Slow 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.

### Can I use Slow Them Down offline?

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.

### What kind of reports can Slow Them Down generate?

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.

### Does Slow Them Down protect privacy?

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.

### Is Slow Them Down suitable for all ages?

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.

### How often is Slow Them Down updated?

The latest version, 1.0.2, was released on August 15, 2026. While specific update frequency isn't detailed, this indicates recent development activity.

### What devices does Slow Them Down support?

Slow Them Down is currently supported on iPhones. It is not available for iPads or Android devices at this time.

### Does Slow Them Down have ads?

No, Slow Them Down does not contain advertisements. The app is free to download and use without any ad interruptions.

## Version history (last 3 releases)

### 1.0.2 — 2026-08-15

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

### 1.0.1 — 2026-03-29

Bug fixes, and added Spanish localization.

### 1.0.0 — 2026-03-27

No release notes.

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## More apps by Duncan Grazier

- [Highball: Train Spotter](https://appshunter.io/ios/app/highball-train-spotter/id6761073894)

All apps by Duncan Grazier: https://appshunter.io/developer/1883130848

## Related topics

[speed gun traffic](https://appshunter.io/ios/topics/speed-gun-traffic)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*