Guides
GPS speedometer guides
Short, practical answers about reading GPS speed on iPhone — setup, accuracy, units, HUD safety, and choosing the right app. Written by the developer of ClearSpeed GPS, including where other apps fit better.
Comparisons
ClearSpeed GPS vs. popular iPhone speedometer apps
Speedometer 55, Speedometer Simple, Speedometer», Speedometer One and more — current prices, ads, and privacy labels.
CompareWaze, Google Maps, or a speedometer app?
Built-in navigation speedometers show speed limits and alerts; a dedicated app shows a bigger number offline. When to use which.
Getting started
A digital speedometer app for iPhone that shows speed first
What the display shows, how it reads GPS, and what it deliberately leaves out.
SettingsChoosing MPH, KM/H, or knots
Which unit fits roads, travel, and water, and how distance units follow.
Trips & historyTrip odometer and trip history on iPhone
Start, pause, resume, end — then review private trip summaries. What’s saved and what isn’t.
HUD mode
A HUD speedometer app for iPhone
How the HUD screen and mirror option work, and the conditions where a reflection is readable.
HUD setupUsing HUD mirror mode safely
Set it up while parked, secure the phone, check the reflection, then leave it alone.
Activities
A GPS speedometer app for boating, in knots
Speed over ground in knots and trip distance in nautical miles — and what a phone can’t replace on the water.
CyclingUsing iPhone as a bike speedometer
A big handlebar speed readout with trip totals — and when a cycling computer or training app is better.
Running & walkingGPS speed for running and walking: when a speedometer helps
Speed, not pace — and why a running app is usually the better tool for runs.
Choosing an app
How to choose a GPS speedometer app for iPhone
Seven things worth checking before you pick a speedometer app, including price model and privacy label.
Pay onceA GPS speedometer app with no subscription
What $3.99 once includes, and when a free or subscription app is the better deal.
PrivacyA private GPS speedometer app with no tracking
What ClearSpeed stores, what it never sends, and how to check any app’s privacy label.
Accuracy & limits
GPS speedometer vs. speed limit app
Your speed vs. the posted limit: two different jobs, and which apps do which.
GPS accuracyHow GPS speedometers work — and how accurate they are
Where the number comes from, what makes it jump, and how the app handles weak signal.
AccuracyGPS speedometer vs. car speedometer: why they differ
Dashboards usually read a little high; GPS can lag. How to compare them fairly.