Speedometer privacy policy

Effective November 2, 2026

Speedometer is a free speedometer app for iPhone and Android and a web app at speed.hertzmc.com, made by Jayden Hertz. This page explains what it does with your information.

Your location

• Speedometer uses your phone's location (GPS) only to work out how fast you're going and how far you've traveled.
• Your GPS position is processed on your phone. Speedometer never sends it to us or anyone else and never stores it on a server. (The ad in the apps gets your IP address, which shows roughly your city; see Ads below.)
• It uses your location only while the app is open on your screen. It does not track you in the background.

What's saved on your phone

Your choice of mph or km/h and your current trip (distance, top speed and moving time) are saved on your phone so they're still there next time. "Reset trip" clears the trip, and uninstalling the app deletes everything. The Android app doesn't copy it to a Google backup.

App updates

When the iPhone or Android app opens, it checks Expo's update service (expo.dev) for small fixes, so they arrive without a full store update. The check sends the app version, the phone's platform, a random ID made for your install and, like any internet request, your IP address. It never includes your location. See Expo's privacy policy.

Ads in the iPhone and Android apps

• The apps show one banner ad from Google AdMob. To show and measure ads and to prevent fraud, Google's software in the app collects some information from your device, such as its IP address (which gives a rough location, like your city), device and app details, an advertising identifier, and how you interact with ads. See how Google uses information from apps that use its services and Google's privacy policy.
• iPhone: the app asks Google for non-personalized ads only and never asks to track you.
• Android: ads may be personalized. You can reset or delete your advertising ID in your phone's Settings (Privacy → Ads, or Google → Ads).
• Where the law requires it (for example in the European Economic Area, the UK and Switzerland), the app asks for your choices before showing ads. You can change them any time in the app: tap i, then Ad privacy choices.
• The web app at speed.hertzmc.com has no ads.

The website

speed.hertzmc.com is delivered by Cloudflare, which counts page visits without cookies (Cloudflare Web Analytics). The speedometer page itself makes no other network requests.

What Speedometer doesn't do

No accounts or sign-up. No access to your contacts, photos, camera or microphone. We don't collect any personal information ourselves, and we don't sell your information.

Who else gets data

Only Google (for the ad) and Expo (for the update check) get the data described above. We use them because their privacy commitments protect your data at least as well as this policy does.

Keeping and deleting data

• We keep nothing about you on our own servers, so there's nothing on our side to delete.
• What's saved on your phone stays until you reset the trip or uninstall the app.
• Google and Expo keep their data for as long as their own policies say (linked above). You can manage Google's ad data with the links above and, where it applies, Ad privacy choices in the app.
• To ask what data exists or to ask for anything to be deleted, email speedometer@hertzmc.com. We'll answer and help you with Google or Expo if needed.

Children

Speedometer is not directed at children under 13, and we don't knowingly collect information from them.

Changes

If this policy changes, we'll update this page and the date at the top.

Contact

Questions? Email speedometer@hertzmc.com.