Use Inertia to measure the acceleration of all kinds of vehicles. When taking measurements, please always observe the Highway Code and do not put yourself or others at risk!
Inertia supports 0–100, 100–200, 0–100–0 km/h, 0-60mph, 0-60-0mph and 50-70mph ‘out of the box’. You can also set your own limits*. The measurements are supported by the iPhone’s built-in accelerometer, in addition to GPS. To help you identify the measurements later, you can enter driving modes and make notes for each measurement.*
With the speedometer mode, you can also use Inertia as a cycle computer, for example. It displays your current speed, as well as a trip computer showing distance travelled, average*, maximum* speed and elevation gain*. Inertia includes 5 additional speedometer skins.*
*Pro features – see the feature list below
To ensure the most accurate measurements possible, please note the following:
- Mount your iPhone securely in the vehicle
- Ensure good GPS reception
- Do not operate the iPhone whilst driving - Configure all settings in the app before setting off
Full list of features:
FREE:
- 0–100 km/h, 100–200 km/h
- 0–100–0 km/h
- 0-60mph
- 0-60-0mph
- 50-70mph
- 1/8, 1/4 and 1/2 mi
- Deceleration test
- English/German
- km/h and mph
- Measurement graph
- Map view of the measurement
- Distance travelled
- Dark/Light Mode
- Speedometer mode: speed and distance travelled are displayed, even without a measurement
- Odometer displays the total distance travelled using the app
- Share function: Share your measurements with your friends
- G-meter
PRO:
- Customisable limits, including deceleration test
- Apple Watch app [BETA]
- Custom limits can be saved
- Speedometer mode displays average and maximum speed as well as elevation gain/loss
- Background mode for the speedometer
- 6 different speedometer designs: Retro, Retro Digital, Modern, Modern Analogue, Race, Electric
- Speedometer designs can be customised with your own VMax
- Backup and restore function
- Notes and ride mode field
- Outside temperature display for measurements and within the speedometer skins
- iPhone battery level is used as a fuel gauge in the speedometer skins
- [BETA] RaceBox Support (In the future, RaceBox Support will be moved to the Ultra Tier)
Please send feedback and feature requests to inertia@frawas.de
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
New features [FREE]:
- A new Game Center achievement has been added
Bug fixes:
- When the default car is deleted, the next one in the list is no longer automatically selected
- When editing a car, it was no longer possible to select another car from the vehicle list in the Measurements tab
- When interpolation was active in measurement mode, the drop-down menu for vehicle selection did not work
Improvements/adjustments:
- Apple Weather Attribution updated
- The text ‘Speedometer mode only’ in the slider under ‘Speed display’ has been changed to ‘Speedometer only’
Please send feedback and feature requests to inertia@frawas.de or via Instagram: @inertia.speed
Version 1.5.1
The developer, Wolfgang Frank, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Wolfgang Frank
Size
3.3 MB
Category
Navigation
Compatibility
Requires iOS 17.0 or later.
iPhone Requires iOS 17.0 or later.
iPad Requires iPadOS 17.0 or later.
Apple Watch Requires watchOS 10.0 or later.
Location
This app may use your location even when it isn’t open, which can decrease device battery life.
